close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3078346

код для вставки
Feb. 19, 1963
P. G. CAMERON ETAL
3,078,336
TELETYPEWRITER MESSAGE DISTRIBUTING SYSTEM
Filed March 28, 1961
ë
.
N
Cì:u
Sw.SwIl
|hmmm
wmNQ
.SBw.
5 Sheets-Sheet 1
wS
#S
.SEwlHil .
Ew.Ew.Nl
Èww
|IlwwÈ
HWS
Èwäw
È(.È?wlw w
.mlit w3 .w@zïmëw
@y
`
d
h
f
Èw:
Èw.
_
Kc’ ¿fà
ATTORNEY
Feb. 19, 1963
P. G. CAMERON ETAL
3,078,336
TELETYPEWRITER MESSAGE DISTRIBUTING SYSTEM
Filed March 2s, 1961
5 Sheets-Sheet 2
ë
A TTORNE Y
Feb. 19, 1963
P. G. CAMERON ErAL
3,078,336 _
TELETYPEWRITER MESSAGE DISTRIBUTING SYSTEM
Filed March 2_8, 1951
5 Sheets-Sheet s
SNK@
AT TORNEV
Feb. 19, 1963
P. G. CAMERON ETAL
3,078,335
TELETYPEWRITER MESSAGE DISTRIBUTING SYSTEM
Filed March 28, 1961
5 Sheets-Shea?I 4
l
Feb. 19, 1963
P. G. CAMERON ErAL
3,078,336
TELETYPEWRITER MESSAGE DISTRIBUTING SYSTEM
Filed March 28, 1961
5 Sheets-Sheet 5
mst-
ATTORA/Ey/
_
y ice
3,078,330
Patented ses, is, tees
2
iY
the various circuits and equipments are arranged to form
a typical distributing system in accordance with the in
3,078,336
TELETYPEWRITER MESSAGE DESTRIBUTING
'
'
SYSTEM
vention; and
Phillip G. Cameron, Walnut Creek, and John L. Maxwell,
Redwood City, Calif., assignors to American Telephone
and Telegraph Company, .New York, NX» a screwe
operate toforrn the `distributing system. `
Filed Mar. `28, 19151, Ser. No. 9S,824
11 Ciain'is.' (Cl. 173-3)
A'
Show the details' of'circuits and equipments which co~
tion of New Yori;
' "
`
FIGS. 2 through 5, when arranged as shown >in FIG. 6,
'
'
10
'ln the drawing, the relay contacts are shown detached
_from the relay windings. riïhe relay winding is given a
letter designation preceded by a number indicating the
ligure number of the drawing on which the relay winding
is located. Contacts associated with the relay winding
This invention relates to a telegraph distribution sys
are given the same number and letter designations. Con
tacts which are closed when the relay is dev-energized,
tem and mere particularly to a .System .for @Meeting mes
sages from station transmitters on single and multistation
known .as f‘break contacts,” are represented by a single
lires and rcutíns the message over e plurality 0f sutseìus
15 short yline perpendicular tothe conductor line, ‘while con
trunk lines.
tacts which are closed when Ythe relay is energized, known
» lt is a broad object of this invention to provide an im
as "‘make contacts,” are represented by two short, crossed
proved system for .Selecting remote ,Stations on Single and
multistation lines one at a time and in rotation,
Another broad object of` this invention is to provide an
improved system for selectively extending trunk lines to
lines diagonally intercepting the -conductor line.
20
station lines.
In certain systems of the type wherein messages are
Referring now to FIG. l, a pluralitylot single and multi
station lines 101 through 105 are >shown extending from
link circuit 103 at a central ydistributing oñice, sometimes
called a telegraph concentrator. Line`101 is a multista
tion line andvextends to station A1, station B1 and sta
tion C1 in series. Similarly, multistation line 102 extends
collected from a plurality of single and multistatinn lines
for transmission to a central station or switching oiiice,
for example, over one _or more trunks, a transmitter-start 25
circuit is provided for _each ,of the _incoming lines to `select
the remote transmitter one at a time and in rotation. In
addition, since the outgoing trunks are fewer in number
to station A2 and station B2 in series, multistation line
103 extends to station E3 and station F3 in series, _and
inultistation line »104 extends to station C4i- and station
_D4 in series.- Line 105 isa single station line which ex
tends to station G5 Vgenenally indicated by block 111.
than the station lines, intermediate message storage v.units
Station ll-‘vily which may be considered typical of the
are required to store incoming messages in the event that 30
outlying stations _includes tape transmitter 112, sequential
all ,the trunks are busy.
selector 113, and transmitter-start 'circuit 114. Sequential
Another object of this invention is to provide a trans~
circuit 113 monitors signals applied'to line 105 and ap
mitterfstart circuit which is common to a plurality of
plies control pulses to transmitter-start circuit 114i- in re
single and multistation lines.
A further obiect of this invention _is to >provide a trans 35 sponse to the application of predetermined signals on line
10S. 4 A sequential selector mechanism suitable -for use in
mitter-.start circuit which is seizable or controllable by
this system is disclosed in Patent 2,568,264'granted to
any one of a plurality of outgoing trunk lines.
An additional object of this invention is to eliminate
W. -JQZenner on September 18, 195i. The disclosure of
erator, provides start-code signals for selectively starting
text andan -end-of-message signal is‘inserted in transmitter
sequence circuit also designates the station line .extending
the message `tape ‘has’be'en inserted in transmitter 112,
the transmitter'isvstarted and the message is applied to
line _1054. At the kconclusion of the message, sequential
selector 113 responds to the end-o'f-message signal by in
structing transmitter-start circuit 114 to stop transmitter
intermediate storage of messages in a telegraph distribu 40 this patent is hereby incorporated herein by reference as
though fully set forth herein.
' Y
tion system.
In order> to transmit a message from transmitter 112,
in accordance with a speciñc embodiment ofthe present
a message tape containing address characters, the message
invention, a sequence circuit, together with a code gen
outlying station message transmitters on a plurality of 45 112. When a predetermined start signal is received from
line l105, sequential selector -113'instru'cts transmitter-’start
single and multistation lines, one at a time and in rotation,
circuit 114 to- start transmitter 112. In the event that
in the event that one of the outgoing trunks is idle. The
to the selected station transmitter in a register associated
with the idle'trunk.` A link >circuit thereupon proceeds to 50
selectively connect the idle trunk to the station line in
accordance with the registered designation and a connec
tor circuit connects the output of the code generator to
the .station line by way ofthe idle trunk circuit whereby
the start-code signal is impressed on the line extending to
the selected station transmitter. lf the selected transmitter
fails to respond, the sequence circuit provides the start
code signal for the nextsuccessive station and designates
the associated Station line _in theidle trunk register where
by the sequence is repeated. In the event, however, that
the selected transmitter is started, the trunk is rendered
busy, the sequence circuit retires until the next trunk be
comes idle and the registered designation is maintained to
preclude the designation of the _line by other registers.
112.
`
.Trunk circuit 106 and trunk circuit 107 also extend
from link circuit 108. Trunk circuits 10dl and 107 are
connected to outgoing trunk A and `-outgoing trunk B,
respectively, and the outgoing trunks in turn may extend,
forV example, to a central switching oíiice. Sequential se«
lector‘l-Z‘iand sequential selector 126, which are sub
stantially identical to the sequential selectors at the out60
lying stations, monitor the signals appliedto trunk circuit
106 and .trunk circuit 107, respectively.
Assuming trunk circuit 106 Ais lidle and no message
is being ntransmitted.to >trunk A, sequence circuit 120
The termination of the message restores the trunk to the 65 proceeds to' code‘the start signal for one of the outlying
stations, such as station A1, on generator 121. With
idle condition and removes the maintained registration.
.trunk circuit 106 idle, sequence circuit 120 also registers
The means for fulfilling the foregoing objects and the
an indication in -register 122 corresponding to line 101
.whichextends to'statio'n A1.Í VRegister 122 in turn ellects
taken in conjunction with the accompanying drawings 70 the connection of line 10.1 to trunk circuit 106by way
practical embodiment of the features of this invention
will be fully understood from the following description
wherein:
FÍG- 1 illustrates in block ferm the manner .ia _which
of link circuit 10,3. In addition, register 122 instructs
seguras? 1,23 t0 connect the @strat Qf _generator »121
3,078,335
3
to line 101 by way of trunk circuit 100 and link circuit
108. With the start signal for station A1 coded on genera
tor 121 and generator 121 connected to trunk circuit
106, the start signal is applied to line 101 whereby the
transmitter at station A1 is started in the event that it is
supplied with the message tape.
ticularly to FlG. 2, a first trunk circuit A, designated by
metallic pair 206, and a second trunk circuit B, desig
nated by metallic pair 207, are shown extending from the
telegraph concentrator. Trunks 206 and 207 may, for
example, extend to a telegraph switching oí’tice. 1n addi
tion, half-duplex telegraph transmission channels 201
through 205 are shown extending from the telegraph con
Assuming that the transmitter at station A1 is not sup
centrator. The half-duplex channels are also shown as
plied with a message tape, no response is received by
metallic transmission pairs. `It is to be understood, how
trunk circuit 106 and sequence circuit 120' proceeds to
code the start signal for the next successive station, such l0 ever, that each of the half-duplex lines may comprise any
of the usual types of telegraph transmission channels suit
as station A2, on generator 121 and register an indica
able for the transmission of telegraph signals in either
tion corresponding to line 102 in register 122. AccordA
direction.
ingly, trunk circuit 106» is extended to line 102 and the
start signal generated by generator 121 is transmitted to
.station A2 by Way of line 102. In this manner each of
Lthe outlying stations is polled for message material by
trunk circuit 106 one at a time and in rotation.
ln the event that the transmitter at station A1 is start
Outlying Stations
Half-duplex line 201 extends to station A1 generally
indicated by block 208, station B1 and station C1.
Similarly, each of the other half-duplex lines extend to
outlying stations designated by the letters A through G.
Outlying station 208 which may be considered typical
ed, the message impressed on line 101 is applied to trunk
A by way of link circuit 103 and trunk circuit 10d. In 20 of the above-mentioned outlying stations includes a trans
response to the initial character of the message, sequential
mitter-distributor 209, a sequential selector 216 and line
selector 12d locks the registration indicating line 101 in
elay Z-LR. The application of signals to line 201 by way
register 122 whereby the link connection from line 101 to
of the primary winding of relay 2-LR and the stop con
trunk circuit 106 is maintained. In addition, register
tact of transmitter-distributor 209 operates the marking
122 informs register 125, which is associated with trunk
contact of relay 2-LR to apply the line signals to select
circuit 107, that line 101 is busy, precluding the registra
tion of an indication corresponding to line 101 in register
125. Register 122 also instructs sequence circuit 120 to
magnet 217 of sequential selector 216.
In response to the end-of-message character sequence,
figures V-Z impressed on line 201, sequential selector 216
register subsequent indications in register 125.
is placed in the “select” condition and momentarily opens
The next subsequent start signal coded by sequence 30 normally closed contacts 219. While in the “select” condi
circuit 120 on generator 121 polls station E3 on line
tion the impression of the character A, for example,
103. In addition, sequence circuit 120 registers an indi
momentarily closes contacts 21S. The impression of the
cation corresponding to line 103 in register 125 and reg
end-of-address character sequence to select magnet 217 re4
ister 12S in turn extends line 103 to trunk circuit 107
stores sequential selector 212 to the “nonselect” condition.
by way of link circuit 103. In addition, register 125
In the event that tape is placed in transmitter-distributor
instructs connector 123 to connect the output of generator
209, tape-out contacts 210 close whereby the momentary
121 to trunk circuit 107'. Accordingly, with trunk cir
closure of contacts 21S completes a path from ground by
cuit 106 busy, trunk circuit 107 proceeds to poll the out
way of contacts 210 and 210 and the winding of relay
lying stations for message material, skipping the stations
2-TSR to battery, operating relay Z-TSR which locks by
on line 101.
1n the event that trunk circuit 107 starts an outlying
station, sequential selector 126 responds to the initial char
actcr of the message by maintaining the registered indi
cation in register 125. With the registrations maintained
in both register 122 and register 125, the operaiton of
' sequence circuit 120' is terminated until an end-of-message
signal is received.
When sequential selector 124 detects an end-of-message
signal, the registered indication in register 122 is removed.
way of contacts 210, make contacts Z-TSR and contacts
21.9 to ground. Relay 2-TSR operated, completes an
obvious energizing path for clutch magnet 211 of transf
mitter-distributor 209. Accordingly, the impression of
the character A on line 201 starts transmitter-distributor
209 in the event that it is supplied with tape.
The tape supplied to transmitter-distributor 209 includes
a message which is preferably preceded by letters charac
ters, the address characters of the called stations and an
end-of-address signal. The message text follows the end
Register 122 in turn instructs link circuit 108 to discon 50 of-address signal and is concluded by the end-of-message
nect line 101 from trunk circuit 106. In addition, reg
sequence ñgures V-Z.
ister 122 restarts sequence circuit 120 whereby trunk cir
Since relay Z-LR follows the signals applied to line 201
cuit 106 again polls the outlying stations. Similarly, the
detection of an end-of-message signal by-sequential selec
tor 12d removes the registration in register 125 whereby
trunk circuit 107 is disconnected from the incoming line.
by transmitter-distributor 209, the impression of the endJ
oit-message signal is applied to select magnet 217 whereby
sequential selector 216 is placed in the “select” condition
and contacts 219 momentarily open to release relay 2ï
TSR. The release of relay Z-TSR opens the previously
without the end-of-message signal, sequential selector 124,
described energizing path for clutch magnet 211 whereby
for example, raises an alarm in alarm circuit 129 by
transmitter-distributor 209 is stopped upon the transmis
way of coder 128. Upon the operation of an appropriate 60 sion of the end-of-message signal. Similarly, the im
key in key panel 130 by the station attendant, coder 128
pression of the character B on line 201 starts the trans
codes the end-of-message signal on generator 121. 1n
mitter-distributor of station B1 and the impression of the
In the event that a message transmission terminates
addition, sequential selector 124 together with register
character C on line 201 starts the transmitter-distributor
122 instructs connector 123 to reconnect the output of
of the station C1 in the same manner. ln a similar Inan
generator 121 to trunk circuit 106 and the end-of-message 65 ner the impression of the character A on line 202 starts
signal is applied to trunk circuit 106 and to line 101 by
way of link circuit 100. The impression of the endaof
message signal on trunk circuit 106 and line 101 re
stores station A1 to the initial condition and removes the
the transmitter-distributor of station 2A, the impression of
the character E on line 203 starts the transmitter~dis-
tributor of station E3, the impression of the character C
on line 204 starts the transmitter-distributor of station
registration in register 122 whereby line 101 is discon 70 C4, the impression of the character G on line 205 starts
the transmitter-distributor of station G5, etc.
proceed to again poll the outlying stations.
Sequence Circuit
Detailed Description
In the initial condition of the telegraph concentrator they
Referring now to FIGS. 2 through 5 and more par 75 upper plate of capacitor 402, FIG. 4, is charged by way
nected from trunk circuit 105 and trunk circuit 106 may
3,078,336
0
While in the “select” condition, the application of the
character letters to select magnet S01 momentarily closes
of resistor 401 which extends to positive battery. This
positive charge is extended to the control electrode of
gas tube 404 by way of resistor 403. After approximately
the make contacts of contacts S03 and momentarily
one second, the positive potential applied tothe control
electrode of tube 404 is raised sufficiently to tire the tube
opens the break contacts of contacts 503. In addition,
contacts 504 momentarily close upon the application of
whereby current is drawn from positive battery by way of
the winding of slow-to-release relay 4-SM1, the break
contacts of contacts 4-SM1, the plate-to-cathode path of
tor 5.02 is restored to the “nonselec” condition in re.
sponse to the application of the end-of-address sequence
each character to select magnet 50,1. Sequential selec
to select magnet 501. In addition, the impression of
tube 404 and the break contacts of contacts 4-SM1 to
ground, operating relay 4-SM1 which locks by way of 10 two successive blank characters to select magnet 501
momentarily closes contacts 506.
the make contacts of contacts LS-SMl and the normally
Returning now to relay 3,-SGA operated, line 201 is
closed interrupter contacts 405 of stepping switch 406 to
extended from battery by way of make contacts 4-TVA1,
ground. Relay '4l-SMI operated, opens the previously
the break contacts of contacts STBKA, the make con
described current path for tube 404 and discharges ca
pacitor 402 to ground by Way of the make contacts of 15 tacts of contacts S-SGA, lead 2,13, the wiper or com
contacts .4è-SM1. In addition, relay 4-SM1 operated, com
rnon lead and the stop Contact of distributor 307, FIG.
pletes an obvious operating path for slow-to-release relay
4-,SM2 and completes an obvious energizing path for step
mary winding of relay Z-LA. Accordingly, distributor
3, -lead 212, make contacts S-SGA, FIG. 2, to the p_ri
307 is placed in series with line 201 and line relay
i
The energization of step magnet 407 opens interruptor 20 2~LA. In addition, relay 3-SGA operated, completes
an energizing path for distributor clutch magnet 306
contacts 405 whereby the locking path of relay 4«SM1 is
of distributor 307 by way of the break contacts of con
opened. When relay _1L-SM1 releases, the operating path
of relay 4.x-SM2 is opened and step magnet 407 is de
tacts S-FZL, break contacts 3-AX1 and make contacts
energized whereby the wipers of arcs 1 through 5 of step
S-SGA, releasing distributor 307 for rotation.
With the wipers of stepping switch 406 on position
ping switch 406 advance one position to position 1, for 25
example, as shown in FIG. 4.
1 of each of arcs 1 through 5, distributor 307 is coded
with the teletypewriter -character A. For example, the
Polling the Outlying Stations
ñrst segment of distributor 307 extends by way of lead
When relay ris-SM2 releases, a path is completed from
301, the >break contacts of contacts S-FZL, FIG. 4, the
ground by way of break contacts 4-SM2, the wiper and 30 wiper and position l of arc 1 of stepping switch 406
position l of arc 6 of stepping switch 406, the break
and lead 308 to lead 212 which, as previously described,
contacts of contacts 3-TRA, break contacts 4-TB1, the
is in series with line 201 and relay Z-LA. Similarly,
winding of relay `4-TA1 and the normally closed con
the second segment of distributor 307 extends by way
tacts of yskip 1 key 40S to battery, operating relay 4-TA1.
of lead 302, the break contacts of contacts S-FZL, FIG.
Relay 4-TA1 operated, opens a short across duplex 35 4, the wiper and position 1 of arc 2 of stepping switch
line 201 by way of break contacts 4-TA1 and 4-TB1.
406 and lead 303 to lead 212. Accordingly, during
`In addition, relay 4-TA1 operated, extends line 201
this rotation of distributor 307 the teletypewriter char-l
through the primary winding of relay 2-LA by way of
acter A is transmitted to line 201 and to trunk circuit
magnet 407 of stepping switch 406.
make contacts 4-TA1, the break contacts of contacts
206.
S-BKA, the break contacts of contacts S-SGA, the pri 40
During the transmission of the start element of the
mary winding of relay Z-LA, the break contacts of con
character A, auxiliary contacts 309 of distributor 307
tacts _S-BKA and make contacts 4-TA1 whereby the
close, completing a path from ground by way of con
normally opened marking contacts of relay Z-LA are
tacts 309, the break contacts of contacts S-FZL and
the winding of relay 3«AX1 to battery, operating relay
closed to short trunk 206. Trunk 206, however, is nor
mally shorted by break contacts S-BKA, S-LUA and 45 3-AX1. Relay 3-AX1 operated, opens the previously
‘i1-TA1 through 4-TA5 maintaining trunk 206 in the
described energizing path for clutch magnet 306 where
marking condition. The operation of relay 4-TA1 thus
by distributor 307 stops at the end of the rotation.
removes the short across trunk 206 whereby the signals
During the transmission of the stop element of the tele
applied to relay Z-LA are repeated to trunk 206 vía
typewriter Vcharacter A, auxiliary contacts 309 reclose,
marking contacts 2-LA. Since trunk circuit 206 ex 50 »operating relay 3-AX2 in series with relay 3-AX1 by
tends by way of the primary winding of relay 2~L1A,
way of break contacts Y4-SM1 and make contacts 3-AX1.
it is noted that the signals applied to trunk 206 are re
With relays 3-AX1 and 3-AX2 operated, the previously
peated by relay 2-L1A.
201 has been extended to trnnk circuit 206. Relay
4-TA1 operated also completes a path from battery
`described operating and holding paths for relay S-SGA
are opened,vv releasing relay S-SGA. Relay S-SGA re
leased, removes the >blinding ground from select magnet
501 _of sequential selector 502, disconnects -distributor
307 from line 201 and reconnects line 201 to relay 2.-LA
by way of the winding of relay S-SGA, FIG. 3, the
as previously described.
Relay 4-'TA1 operated also completes an obvious ener
gizing path for lamp 507, FIG. 5, indicating that line
55
break contacts of contacts ê-FZL, make contacts 4-TA1,
r[he transmission of the character A to line 201 starts
the break contacts of contacts SFTRA and break con 60 transmitter-distributor 209 at station 208 in the event
tacts Í-l-SMZ’, 4-SM1 and 3-AX1 to ground, operating
that the transmitter is supplied with tape. Assuming,
relay 3«SGA which locks by way of the break contacts
however, that vtransmitter-distributor 209- is not started,
capacitor 402 is again charged by way of resistor 401
of contacts S-FZL, make contacts 3-SGA and break
contacts 3-AX2. Relay 3~SGA operated, extends ground
and tube 404 retires after one second, as previously de
to select magnet 501 of sequential selector 502., FlG.
5, by way of make contacts S-SGA, lead 508 and break
contacts 3-FZL. It is noted that the winding of select
scribed, >whereby relay 4~SM1 operates and locks as
previously described. Relay 4-SM-1 operated, extin
guishes tube 404, completes the previously-described ener
magnet 501 also extends to the marking contacts of
gizing path for step magnet 407 and the previously-de
relay 2-L1A whereby select magnet 501 normally _follows
scribed operating path for relay 4-SM2. In addition,
signals applied to trunk 206. Accordingly, the opera
tion of relay S-SGA blinds select magnet 501 to the
relay 4-SM1 operated, opens the previously-described
operating path for relays 3-AX1 and 3-AX2 in series,
whereby these latter relays release. Relay 4-SM2 oper
ated, opens the previously-described operating path for
signals applied to trunk 206.
Sequential selector 50,2, in response to the end=of
message code sequence ñgures V.-Z, is placed in the
relay 4-.TA1, releasing this relay. The release of relay
“select” condition and momentarily opens contacts 50,5. 75 .45M extinsuishes lamp 507 and @peas the previoaSlY'
3,076,836
ïi
8
escribed path extending line Zul to relay Z-LA. In ad
dition, relay ltr-TA1 released, recompletes the previously
described shunting path for trunk 266.
by way of the break contacts of contacts 5%, contacts
Sti-’1.5. the break contacts of contacts 5-UNA and the
winding of relay S-UNA to batter‘, operating the relay
Returning now to the energization of step magnet 467,
which locks by Way of the make contacts of contacts
interrupter contacts ¿lßä open to release relay »fl-SM1 as
S-UNA and normally closed contacts 5&5. Relay ë-UNA
operated, completes an obvious energizing path for lamp
5.?.2 indicating that trunk circuit 296 is busy. ln addi
tion, relay S-UNA operated, completes a locking path
'
previously described. Relay d-SMI released in turn
opens the operating path for relay Ll-SMZ and the ener
gizing path for step magnet M97. The de-energization
for relay 4-TA2 by way of make contacts 4-TA2 and
of step magnet 4557 steps the wipers of stepping switch
4536 to position 2. When relay fl--SM'Z releases, a path is
make contacts S-UNA. Relay S-UNA operated also
removes ground applied to the control electrode of tube
5M by way of resistor SiS and the break contacts of
contacts S-UNA. Tube 5M is thus unblinded and ca
thus completed from ground by Way of break contacts
¿i-SMZ, the wiper and position 2 of arc o of stepping
switch fille, the break contacts of contacts î-TRA, break
contacts li-TBZ, the winding of relay 4-TA2 and skip Z
key 409 to battery, operating relay fir-TAE.
pacitor` 535 charges by way of resistor Sie during the
transmission of marking signals and discharges to' ground
by way of the spacing contact of relay 2-LiA during the
Relay ¿lf-TAZ operated, opens the previously-described
transmission of spacing signals.
’shunting path across trunk 266 and completes an obvious
Returning now to relay S-UNA operated, a path is
completed from battery by way of the winding of relay
of trunk 2% to line 262. In addition, relay d-TAZ oper
ated, extends line 2552 from battery by way of make con 20 SJFRA, FIG. 3, make contacts â-UNA and break con
tacts ¿Pa-HDA to ground, operating relay .7a-TRA which
tacts d-TAZ, the break contacts of contacts S-BKA, the
locks by way of make contacts S-TRA and break con
break contacts of contacts S-SGA, the primary winding
tacts Att-SM1.
vof relay 2-LA, the break contacts of contacts S-BKA and
make contacts 4-TA2 to ground on line 292. Accord
Trunk B Poils Outlying Stations
ingiy line 262 is placed in series with relay Z--LA whereby '
During the interval following the transmission of the
the signals applied thereto are repeated to trunk 296 by
letters signals, tube étie- resumes timing and at the end
the marking contacts of relay Z-LA.
energizing path for lamp 5499 indicating the connection
of the timing period thereof relay li-SMl operates, op
Relay Ltr-TAZ operated also completes a path from
erating relay ¿lf-SM2 and energizing step magnet 467 as
battery by way of the winding of relay S-SGA, the break
contacts of relay .'i-FZL, make contacts ét-TAZ, the break 30 previously described. When step magnet 497 is ener
contacts of contacts S-TRA and break contacts 11i-SM2,
g1zed, relay d-SMl releases, opening the operating path
d-SME and S-AXl to ground, operating relay S-SGA
which locks as previously described. Relay 3~SGA oper
ated, places distributor 3‘1l7 in series with relay 2-LA
by the wipers of stepping switch 466 step to the next posi
of relay d-SMZ and de-energizing step magnet dit?? where
tron, as previously described, which in this case is posi
which in turn is in series with line 262 by way of the 35 non 3.
The subsequent release of relay 4-SM2 completes a
path from ground by way of break contacts ßi-SMZ, the
make contacts of relay deTA2. Accordingly, distributor
3W now transmits to line 202.
wiper and position 3 of arc 6 of stepping switch 406,
the make contacts of contacts S-TRA, break contacts
Returning now to relay E‘a-SGA operated, the previous
ly-described blinding ground for select magnet Stil is re
applied and the previously-described energizing path for
40
distributor clutch magnet 367 is recompleted. With the
wipers of stepping switch 4% on position 2, it is appar
ent that distributor 3%'7 is again coded with the teletype
writer character A which is transmitted to line 202 to
start station A2 in the event that the station A2 transmit
ter-distributor is supplied with tape.
During the transmission of the start element of the
character A, auxiliary contacts 339 close to operate relay
S-AXl, as previously described, and relay S-AXlt oper
S57 indicating that trunk 207 is extended to line 203.
Relay ¿i-TB3 operated also removes the short across line
ZÜS by way of break contacts 4-TA3 and 4-TB3. In
addition, relay lä-TBE operated, extends line 263 from
battery by way of make contacts 4-TB3, the break con
tacts of contacts S-BKB, the break contacts of contacts
S-SGB, the primary winding of relay 2-LB, the break
ated, opens the previously-described energizing path for
contacts of contacts S-BKB and make contacts ¿fl-TBS
to ground on line 2GB. Accordingly, line 263 is extended
distributor clutch magnet 366. During the transmission
of the stop element of the character A, auxiliary contacts
389 reopen whereby relay S-AXZ operates in series with
relay 3-AX1 and with relays S-AXl and 3-AX2 oper
ated, relay S-SGA releases as previously described. The
release of relay '3s-SGA removes the blinding ground from
select magnet Stil and disconnects distributor 397 from
line 262 and relay Z-LA as previously described. The
through the primary winding of relay Z-LB whereby
signals from line 203 are repeated to trunk 297 by way
of the marking contacts of relay 2-LB. It is noted that
trunk 267 is normally shorted by way of break contacts
S-BKB, S-LUB and Al-TBl through ¿t-TBS to maintain
the trunk in the marking condition. The operation of
relay ¿i-TBC‘B, however, removes the short thereby un
circuit now awaits the response, if any, from station A2
on line 2&2.
Trunk A Receives Messcfge
Assuming now that line 2%2 responds by sending a
message tape, in the event that a message is preceded by
letters characters, the letters signals are transmitted to
trunk circuit 2% and repeated by relay 2~LlA to select
magnet Siti as previously described. ln response to each
letters character, sequential selector 562 momentarily
¿t-TAE, the winding of relay -€~TB3 and skip 3 key 411
to battery, operating relay fît-TBS. Relay d-TBS op
erated, completes an obvious energizing path for lamp
60
blinding relay Z-LEB to signals repeated by relay Z-LB.
Relay 4-TB3 operated also completes a path from
battery by way of the winding of relay S-SGB, the break
contacts of contacts S-FZL, make contacts él-TB3, break
contacts S-TRB, the make contacts of contacts S-TRA
and break contacts ¿il-SM2, ¿ä-SMl and S-AXl to ground,
operating relay B-SGB which locks by way of the break
contacts of contacts S-FZL, make contacts 3-SGB and
break contacts S-AX... Relay 3-SGB operated, extends
ground to select magnet Síël of sequential selector 552
by way of make contacts S-SGB and break contacts
closes the make contacts of contacts 503 applying ground
by way of the make contacts of contacts 503 and lead 511 70 S-FZL. Accordingly, sequential selector 552, which is
to the upper plate of capacitor 492 thereby suppressing
substantially identical to sequential selector 592, is blinded
to signals applied to select magnet 55E. by Way of the
the timing of tube 4M».
make contacts of relay Z-LlB.
When the ñrst character of the address code is repeated
Relay â-SGB operated, connects distributor 367 in
to select magnet Sill., sequential selector 592 momentarily
series with line 293 and the primary Winding of relay
closes make Contact 5% completing a, path ’from ground
3,073,336
9
2~LB by way of the make contacts of contacts 3-SGB,
lead 213, the common lead and stop contacts of distribu
tor 307, lead 212 and make contacts 3»SGB. In addition,
is
The release of relay S-UNA opens the previously-de~
vscribed energizing path for lamp 512 extinguishing the
lamp and reapplies ground to capacitor 515 precluding
the operation of tube 514.
relay 3~SGB operated, completes the energizing path for
In addition, relay S-UNA
operated, opens the previously-described locking path for
distributor clutch magnet 306 by way of the break con
tacts of contacts 3-FZL, break contacts 3-AX1 and make
relay 4-TA2 and this relay releases.
The release of relay 4-TA2 opens the previously-de
scribed energizing path for lamp 509 extinguishing the
lamp. In addition, relay 4-TA2 released, reshunts line
contacts S-SGB. Distributor 307 now proceeds to send
the start code to line 203 in the same manner as pre
viously described. It is noted, however, with stepping
switch 406 on position 3 that distributor 307 is coded 10 202 by way of break contacts 4-TA2 and 4-TB2 and dis
connects line 202 from the winding of relay 2-LA by
with the character E since the ñrst segment extends by
way of the make contacts of relay 4~TA2.
lead 301, the break contacts of contacts S-FZL, the
Returning now to the release of relay S-UNA, the pre
wiper and position 3 of arc 1 of stepping switch 406 and
viously-described discharge path for capacitor 402 is
lead 308 to lead 212. Accordingly, the circuit will pro
ceed to connect each of the lines to trunk 207, polling 15 opened at make. contacts S-UNA whereby tube 404 starts
to time out. When tube 404 tires, relay 4«SM1 operates
each station for message material in substantially the
as previously described. The operation of relay 4-SM1
same manner as previously described.
opens the previously-described locking path for relay 3«
In the event that the circuit attempts to poll a station
TRA and this relay releases. With relay S-TRA re
on line 202 by stepping to position 6, for example, be
leased and relay 4-SM1 operated, trunk circuit 206 re
fore the termination of the transmission from station A2
sumes the polling of the outlyingstations in the same man
to trunk 206, it is noted that the operating path of relay
ner as previously described.
-TBZ is open at break contacts 4-TA2 precluding the
The transmission of the end-of-address signal by sta
operation of relay 4-TB2. In this event, line 202 is not
tion E3 to trunk 207 sets sequential selector 552 rin the
connected to trunk 207 and tube 404 again times out to
advance the wipers of stepping switch 406 whereby the 25 “nonselect” condition. When the end-of-message signal
is transmitted by station E2, sequential selector 552 is
stations on line 202 are skipped.
reset in the “select” condition and contacts 555 momen
Trunk B Receives Message
tarily open to release relay S-UNB. The release of relay
S-UNB opens the previously-described energizing path for
Assuming now that station E3 responds to the polling
character transmitted by distributor 307 by sending a 30 lamp 5,62, reapplies ground to capacitor 565 by Way of the
break contacts of contacts ‘S-UNBA and opens the previ
message tape, the message signals are repeated to trunk
ously-described locking path for relay 4-TB3. The re
207 by relay Z-LB and relay 2-L1B in turn repeats the
lease of relay 4-TB3 opens the previously-described ener
signals to select magnet 551. If the initial characters are
gizing path for lamp 557, reshunts line ‘203 by way of
letters signals, ground is applied by way of the make con
tacts of contacts 553 and lead 511 to the upper plate of 35 break contacts 4-TA3 and 4-TB3 and releases the con
nection of line 203 to the primary winding of relay 2-LB
capacitor 402 to preclude the timing of tube 404.
by way of the make contacts of relay 4-TB3.
The first character of the address signal momentarily
In the event that trunk 206 has resumed polling, the re
closes contacts 554, completing a path from ground by
lease of relay 5~UNB Atogether with the above-described
way of the break contacts of contacts 553, contacts 554,
the break contacts of contacts S-UNB and the winding 40 operation of relay 4-SM1 releases relay S-TRB. If the
of relay ä-UNB to battery, operating the relay which
' message being transmitted to trunk 206 has not concluded,
the release of relay S-UNB opens the previously-described
discharge path for capacitor 402 whereby tube 404 re
locks by way of the make contacts of contacts S-UNB
and normally closed contacts 55S. Relay S-UNB op
tires to operate relay 4-SM1 as previously described. The
erated, completes a path from battery by way of the wind
operation of relay 4-SM1 opens the previously-described
locking path for relay S-TRB to release the relay. With
relay S-TRB released, trunk 207 resumes polling if a
ing relay 12J-TRB, make contacts 5-~UNB and break con
tacts Sti-HDB to ground, operating relay 3-TRB which
locks by way of make contacts S-TRB and break con
tacts 4-SM1. In addition, relay S-UNB operated, com
y message is being transmitted into trunk 206.
pletes a locking path for relay 4-TB3 by Way of make
End-.of-Message Coder
contacts ffl-TBS and make contacts S~UNB. Relay 5 50 Assuming now that the message from station A2 ends
UNB operated also completes an obvious energizing path
without the transmission of the end-of-message signal, the
for lamp 562 indicating the transmission of a message to
marking condition maintained on line 202 and repeated
trunk 207. In addition, relay S-«UNB operated, removes
to trunk 206 maintains the armature of relay 2~L1A on
ground applied to capacitor 565 by Way of the break con~
the marking contact whereby blinding ground is removed
tacts of contacts S-UNB whereby capacitor 56S is charged
from capacitor 515 by way of the space contacts of relay
by way of resistor 566 during the transmission of marking
2-L1A. Accordingly, capacitor 515 charges by way of
signals and discharged by Way of the spacing contacts of
resistor 516 and the increased potential is applied to the
relay Z-LlB during the transmission of marking signals.
control electrode of tube 514- by way of resistor 513.
With relays S-UNA and S-UNB operated, ground is
After approximately one minute, tube 514 tires, drawing
applied to the upper plate of capacitor 402 by way of
current by way of the winding of relay S-LUA, the break
the make contacts of these relays to preclude the timing
contacts of contacts S-LUA, the plate-to-cathode path of
of tube 404 whereby the operation of this circuit is
tube 514 and the break contacts of contacts S-LUA to
stopped until the completion of the message from either
ground, operating relay S-LUA which locks by way of the
of the transmitting stations.
make contacts of contacts S-LUA and the make cont-acts
Termination of Message
Returning now to the transmission of the message
from station A2 to trunk 206, the end-of-address se
quence is sent at the conclusion of the transmission of
the address codes, setting sequential selector 502 in the
“nonselect” condition. The end-of-message sequence
figures V-«Z is transmitted at the end of the message re
65
of contacts S-UNA. The operation of relay S-LUA
opens the previously-described discharge path of tube 514
extinguishing the tube and discharges capacitor 515 to
ground by way of the make contacts of contacts S-LUA.
In addition, relay 5-LUA operated, completes an obvious
energizing path for lamp 517 indicating a lockup of trunk
206. Relay S-LUA operated also >completes an obvious
energizing path for relay S-AL and relay S-AL operated,
setting sequential selector 502 into the “select” condition
completes an energizing path for buzzer alarm 518 by
and momentarily opening contacts 505 whereby the lock
ing path for relay S-UNA is opened to release the relay. 75 way of make contacts S-AL and break contacts .S-AR.
emesse
il.
YThe attendant is thus advised that the station has ceased
transmitting to trunk 296 Without sending the end-of-rnes
During the transmission of the start element of the
_character figures, auxiliary contacts 3% momentariiy
sage signal.
close, applying ground by Way of contacts 3d?, the make
To release buzzer alarm 51S, the attendant momen
tarily operates buzzer release key 519 completing an ob
contacts of contacts ê-FZL, the break contacts of con~
tacts È-CZ and the winding of relay E-Cî to battery.
When auxiliary contacts 369 reopen at the conclusion of
the transmission of the îigures character, relay ’3x-C2 op
erates in series with relay S-Cl by Way of make con
S-AR opens the previously-described energizing path for
tacts 3-Cl, thc Winding of rela‘ 3-(22 and break con
buzzer alarm 518.
ln the event that the message from station E3 to trunk 10 tacts â-FZR. Relay 3-CZ operated, recompletes the en
ergizing path for distributor clutch magnet 366 by way
207 ends Without the end of transmission of the message
of break contacts 3-C3 and make contacts 3-C2 which
signal, the operation of the armature of relay 2-LllB to
vious energizing path for relay S-AR which locks to
ground by Way of make contacts S-AR and 5-AL. Relay
» the marking contacts opens the previously-described dis
shunt break contacts S-Cì in the previously~described en~
ergizing path for clutch magnet 3% whereby distributor
charge path for capacitor 5&5 whereby tube 564 ñres at the
termination of a one-minute interval, drawing plate cur 15 367 is released for a second rotation.
rent by way ot the winding of relay S-LUB and the
For the second rotation of distributor 397, the dis
break contacts of contacts ë-LUB. Relay 5-LUB oper
ated, locks by way of the make cont-acts of contacts
5-LUB and the make contacts of contacts S-UNB. In
tributor segments are coded for the character V.
The
second segment extends to lead 39E by way of lead 3b.?,
the make contacts of contacts 3-FZL and the break con-
addition, relay S-LUB operated, completes an obvious 20 tacts of contacts 3-Cß‘t. The third segment extends to
. energizing path for lookup lamp 567, discharges capacitor
lead 368 by way of lead EQ2, the make contacts of con
tacts â-'FZL make contacts 3-C2 and break contacts
3~C«i~. The fourth segment extends to lead SGS by way
of lead 3%4, the make contacts of contacts Ea-FZ‘L and
Relay S-AL completes the previously-described energizing
path for buzzer alarm 518. The attendant is thus advised 25 break contacts S-Cd. The ñfth segment extends to lead
303 by Way of lead 3tl5 and the make contacts of contacts
that the message being transmitted into trunk 207 termi
565 by way of the make contacts of contacts 5~-LUB and
completes an obvious energizing path for relay S-AL.
nated Without the transmission of the end-of-message sig
S-FZL.
'
During the transmission of the start element of the
nal. The attendant may release buzzer alarm 518 by op
erating key 519 in the same manner as previously de
character V, contacts 399 close to extend ground by
30 way of the make contacts of contacts S-FZL, the make
scribed.
To release the above-described lockup condition, the
attendant momentarily operates clear key Sil, FIG. 3.
The momentary operation of key Eli completes a path
from ground by Way of key Sill, make contacts ë-LUA
contacts of contacts S-CZ and the break contacts of con
tacts 3-C4 to the Winding of relay itt-C3.
At the con
clusion of the transmission of the character V, auxiliary
contacts 3€?? reopen and relay 3-C4 operates in series
or â-LUB, the break contacts of contacts S-FZL, break 35 with relay .ft-C3 by Way of make contacts 3-C3, the
contacts SJEZR and the Winding of relay 3~FZL to bat
winding of relay 3-C4 and break contacts S-FZR. Re
tery, operating relay S-PZL which lock by Way of break
lay S-Cd operated, completes a path ‘oy way of break
contacts S-Câ and make contacts 3-C4, shunting break
contacts 3-Cl in the previously-described energizing path
Assuming that trunk 2% is in the lockup condition, 40 for clutch lmagnet 396 whereby distributor 397 is released
the operation of relay 3-FZL completes a path from bat
for a third revolution.
tery by Way of the winding of relay S-SGA, the make
For the third rotation of distributor 367 the segments
contacts of contacts S-FZL and the make contacts of
are coded with the character Z. The first segment ex
contacts â-LUA, operating relay S-SGA. If the lockup
tends to lead 368 by Way of lead 30d, the make contacts
condition is associated with trunk Zd?, the operation of
of contacts â-F L and the make contacts of contacts
relay S-FZL completes a path from battery by way of
S-Cd.
“he fifth segment extends to lead 366 by way
the winding of relay S-SGB, the make contacts of con
of lead 395 and the make contacts of contacts S-FZL.
tacts S-FZL, maite contacts S-LUB and the break con
During the transmission of the start element of the char~
tacts of contacts 5-LUA, operating relay â-SGB. In ad
acter Z, auxiliary contacts 399 close, extending ground
dition, relay Í’f-FZL operated, opens the previously-de 50 by Way of the make contacts of contacts Ss-FZL, the make
scribed blinding ground for the appropriate one of sc«
contacts of contacts E-CZ, the make contacts of contacts
quential seiectors 502 or Sdi. Relay EHFZL operated
S-Cd and the break contacts of contacts S-Cd to the
also completes a discharge path for capacitor ¿§62 by
Winding of rel-ay 3-C5. At the termination of the char
acter Z, auxiliary contacts 399 reopen and relay Ié-Cd
way of the make contacts of contacts fr-FZL precluding
operates in series with relay 3-C5 by way of make con
the operation of tube 4%.
The operation of relay .7s-SGA or ë-SGB places dis
tacts 3-C5, the winding of relay S-Cñ and break contacts
tributor dit? in series with relay E-LA or È-LB and
3«FZR. Relay S-Có operated, completes a path by Way
the appropriate line connected thereto as previously de~
of break contacts 3-C7 and make contacts 3-(2'6, shunting
break contacts S-Cl in the previously-described energiz
scribed. in addition, relay S-SGA or 3»SGB operated,
contacts S-FZR and the make contacts of contacts 3~
FZL.
completes the energizing path for distributor clutch mag 60 ing path for distributor clutch magnet 3&6 whereby dis~
net 3536 by Way of the make contacts of contacts 3
FZL, break contacts â-Cî and make contacts ßv-SGA
or ,T1-SGB, releasing distributor 367 for rotation.
For the tiret rotation of distributor 3%7, the distribu
tor segments are coded for the character figures. The
ñrst segment extends by way of lead Stil to lead 2li?.
tributor 3%7 is released for a fourth rotation.
For the fourth rotation of distributor 397, the char
acter letters are coded on the segments, lead 216i extends
to lead 393 by Way of the make contacts of relays Iê-FZL
and 3~C4i~ Lead 3&2, extends to lead 3533 by Way of the
make contacts of contacts E-FZL and make contacts 3-Cd. Lead 3% extends to lead 3% by Way of the make
contacts of contacts 3-FZL, make contacts 'al-C2 and
make contacts 3-C6. Lead 3M extends to lead 392% by
by way of the make contacts of contacts â-FZL and
break contacts 3-C2. The second segment is extended
to lead EEZ by Way of lead 3dB, the make contacts of
contacts S-FZL and the break contacts of contacts 3-~ 70 way of the make contacts of contacts S-FZL and make
Cd. The fourth segment is extended to lead 2l?, by
contacts 3-(26. Lead 3dS extends to lead 3% by way
way of lead 3M, the make contacts of contacts S-FZL
of the make contacts of contacts S--FZL
and break contacts „Él-Cd. The fifth segment is extended
During the transmission of the start element of the let
to lead 212 by Way of lead 365 and the make contacts
ters character, auxiliary contacts 3d@ close, extending
of contacts 3-FZL.
75 ground `by way of the malte contacts of contacts liv-FILL,
'3,078,336
3-C2, 3-C4 and 3-C6 to the winding of relay 3-C7. At
the termination of the transmission of the letters char
acter, auxiliary contacts 309 reopen and relay 3-C8
Operates in series with relay 3-C7 by way of make con
14
or 571 is energized together with the lockup lamp 517
or 567. Assuming that during the transmission of the
message from station A2 to trunk 206 the line opens,
relay 2-LA repeats a spacing signal to relay Z-LlA. The
tacts 3«C7, the winding of relay 3~C3 and break contacts
S-FZR. Relay 3-C8 operated, completes an obvious
operating path for relay 3-FZR which locks by Way of
maintenance of the armature of relay Z-LliA on the
contacts S-LUA and make contacts S-LUB.
contacts of contacts S-BKA and contacts 505.
spacing contact is read Áby sequential selector 502 as suc
cessive blank characters momentarily closing contacts
S06 »whereby ground is extended to the winding of relay
make contacts S-FZR, break contacts 4-SM2 and the
5-BKA by Way of the break contacts of contacts 5-BKA,
make contacts of contacts S-LUA or in the event that
trunk 207 is locked up by Way of the break contacts of 10 operating relay S-BKA which locks by Way of the make
Relay
S-BKA operated, completes an obvious energizing path
Relay S-FZR operated, opens the previously-described
for lamp 521 and an obvious operating path lfor relay
holding path for relays 3-C1 through 3-C8 and these
S-AL. Relay S-AL operated, completes the energizing
relays release. In addition, relay S-FZR operated, opens
path
for buzzer alarm 518 as previously described.
15
the previously-described operating and locking paths for
Returning now to relay S-BKA operated, a path is
relay SQFZL. 'I‘he release of relay kS--FZL opens the pre
completed from battery by way of resistor 214, the make
viously-described operating path for relay 3-SGA or
contacts of contacts S-BKA, the break contacts of con
relay 3-SGB and the appropriate relay releases. In ad
tacts S-SGA, the primary Winding of relay 2-LA and
dition, relay 3«FZI. released, opens the previously-de
scribed discharge path for capacitor 402 by Way of make 20 the make contacts of contacts S-BKA to ground, operat
ing the armature of relay 2-LA to the marking contacts.
4_contacts 3-FZL.
This marking signal is repeated to relay 2-L1A, opening
Assuming trunk 206 is in the lockup condition the
the Vpreviously-idescribed discharge path for capacitor
transmission of the end-of-message signal figures V~-Z
515 by way of the space contacts of relay Z-LIA. Ca
letters resets -sequential selector 502 in the “select” con
dition and momentarily opens contacts 505 to release 25 pacitor 515 now proceeds to charge by Way of resistor
relay S-UNA as previously described. Relay S-UNA
released, opens the previously-described locking path for
relay SfLUA and this latter relay releases. Relay S-UNA
released also opens a possible discharge path for capaci
tor 402 by way of the make contacts of relays S-UNB
and S-UNA. In addition, relay S-UNA released, opens
516 and,l in parallel thereto, by Way ot resistor 522 and
make contacts S-BKA. After approximately one second,
tube 514 fires to operate relay 5~LUA as previously de
scribed. The operation of relay S-LUA completes the
energizing path for lamp 517 -and extinguishes tube 514.
Buzzer alarm 518 may be de-energized by the operation
-of release key 519 as previously described.
the previously-described energizing path for lamp 512
To clear the line break condition, the attendant oper
extinguishing the lamp and opens the previously-described
ates the appropriate skip key together with clear key 311.
locking path for relay 4-TA2, releasing this relay.
Relay 4-TA2 released, extinguishes lamp 509, reapplies 35 With station 202 locked up to trunk 206 as indicated by
the energization of lamps 509, 521 and 517, the opera
the -shortsacross line 202 and trunk 206 and releases the
tion of skip 2 key 409 opens the previously-described
connection between line 202 and relay 2-LA as previously
>operating and locking paths for relay d-TAZ., releasing
described. Relay S-LUA released, opens the previously
described »operating path for relay 5«AL and the locking 40 the relay. The release of relay 4-TA2 opens the connec
tion between line 202 and trunk 206 and extinguishes
path for relay 3-FZR and these relays release. In addi
lamp 509 as previously described.
tion, relay S-LUA released, opens the previously-de-4
The attendant now operates clear key 311 whereby re
scribed energizing path for lamp 517. The release of
lay S-FZL operates and relay S-FZL together with re
relay S-AL opens the locking path for relay S-AR, re
lay S-LUA completes the previously-described operating
leasing the relay. With relays S-FZL and S-UNA re
path for relay 3-SGA. The operation of relay 3-SGA
45
leased, capacitor 402 again starts to charge and relay
4-SM1 operates when tube 404 lires as previously de
scribed. The operation of relay 4-SM1 opens the pre
connects distributor 307 in series with trunk 206 and dis
tributor 307 sends the end-of-messagc signal to trunk
viously-described locking path for relay S-TRA. With
206 as previously described.
signal.
Similarly, an open line during the transmission of a
message from station E3 to trunk 207 operates the arma
At the termination of the transmission of the end-of
the release of relay S-TRA, trunk 206 resumes the polling
50 message signal, relay â-FZR operates followed by the
of the outlying stations.
release of relays S-FZL and S-SGA. The reception of
In the event that trunk 207 is in the lockup condition,
the
end-of-message signal by sequential selector 502 re
the transmission of the end-of-message signal by distrib
s-tores it to the “select” condition and momentarily opens
utor 307 momentarily opens contacts 555 to release relay
contacts 505 to release relay S-UNA as previously de
>S-UNB as previously described. The release of relay
scribed. In addition, the momentary opening of contacts
5
E-UNB opens the previously-described locking paths for
S05
opens the previously-described locking path for relay
relays S-LUB and 4-TB3 and these relays release. In
S-BKA and relay S-BKA in turn extinguishes lamp S21.
addition, the release of relay S-UNB extinguishes lamp
The release of relay S-UNA releases relay 5-LUA
562.
and extinguishes lamp SI2 as previously described. Re»
The release of relay 4-TB3 extinguishes lamp 557, re
lay S-LUA in turn releases relays 3~FZR and S-AL and
shorts trunk 207 and line 203 and disconnects line 203 0 relay 5~AL released opens the locking path of relay
from relay 2~LB as previously described. The release of
S-AR as previously described.
relay S-LUB extinguishes lamp S67, opens the previously
The connection between line 202 and trunk 206 is
described locking path for relay 3~FZR and the operating
now `released and line 202 is on “skip” since key ¿509 is
path for relay 5-AL and these relays release. The release
operated. With relay S-FZL released, tube 404 again
of relay S-AL releases relay S-AR as previously de- 6 OI tires to operate relay 4-SM1 which in turn releases relay
scribed. With relays 3-FZL and 5~UNB released, tube
3-TRA. When relay 3~TRA releases, trunk 206 re
404 retires to operate relay 4-SM1 which in turn opens
sumes searching for trañ‘ic as previously described. It is
the previously-described locking path for relay 3~TRB
noted, however, that the stations on line 202 are skipped
placing trunk 207 in the same condition which results
since the operating path of relay 4-TA2 is open at the
when the message is terminated by the end-of-message 70 contacts of skip 2 key 409.
M iscellaneous Alarms
In the event that a line break occurs during the trans~
ture of relay Z-LIB to its spacing contacts. This is read
mission of the message, the appropriate break lamp S21 75 by sequential selector 552 as successive blank characters
l5
completing the energizing path for relay S-BliB. Relay
S-EKB in turn completes the energizing path for lamp
571 and an obvious operating path for relay S-AL and
relay S-AL in turn energizes buzzer' alarm ô'lë. Relay
S-BKB also completes a path from `battery by way of
tion of the spacing signal as the character blank momen
tarily closes contacts 504 whereby relay 5-UNA operates
as previously described.
Relay 5~UNA operated, energizes lamp SïZ and oper
ates relay S-TRA as previously described. Relay S-BKA
operated, connects line battery to relay Z-LA, energizes
resistor ZlS, to make contacts of contacts S-BKB, the .
lamp 523; and operates relay S-AL which in turn encr
break contacts of contacts 3-SGB, the primary winding
gizes buzzer Slt; as previously described. Bnzzer ßìß
of relay E-LB and the make contacts of contacts 5~BKB
may be cie-energized by the operation of release key 5l9
to ground, operating the armature of relay Z-LB to its
marking condition. The armature of relay Z-LlB is 10 as previously described. At this time, with relays 5-UNA
Z-TRA operated, trunk 2% is locked out of the
_operated to its marking contacts whereby capacitor 565
circuit and the search for message material is transferred
1s charged by way of resistors 56d and 572 in parallel.
to trunk 2li?.
Tube
tires after approximately one second and relay
When the trunk closes after the open condition, the
â~LUB operates to energize lamp 567 and extinguish tube
armature of relay Z-LllA is operated to the marking
âe/l. Buzzer alarm 513 may »be (le-energized by the
contacts, opening the previously~described discharge path
operation of key 5tlg as previously described.
for capacitor Sib'. With relay fai-EKA operated, tube
The line break condition may be cleared by the opera
tires after approximately one second to operate relay
tion of skip 3 key 411 and clear key 313i. Key ¿lll op
S-LUA which in turn energizes lockup lamp El?.
erated, opens the previously-described operating and lock
The attendant may clear the trunk after it closes by
ing paths for relay ¿ti-T53 and relay ‘ll-TES in turn de
operating clear key Sli. The momentary closure of key
energizes lamp S57’ and opens the previously-described
jill operates relay E-FZL which in turn operates relay
connection between line Ztil` and relay Z-LB. The mo
S-SGA as previously described. Relay B_SGA. oper~
mentary operation of key lill operates relay â-FZL
ated, connects distributor 367 in series with the primary
which in turn operates relay Z13-SGB as previously de
winding of relay Z-LA and distributor êtl7 sends the
scribed. Relay 3-SGB operated, connects distributor 30'7
end-of-message signal to trunk 2Go in the same manner
in series with the primary winding of relay Z-LB and
as previously described. At the termination of the trans~
distributor 3€?? sends the end~of-message signal to trunk
mission of the end-oi-message signal, relay S-FZR oper~
Ztl? as previously described.
ales, releasing relay BeFZL which in turn releases relay
At the termination of the transmission of the end-of
3-SGA as previously described. In addition, sequential
rnessage signal, relay â-FZR operates, releasing relay
selector 5tl2 responds to the end-oi-message signal by
S-FZL and relay S-SGB as previously described. In adn
momentarily opening contacts âtiîi to release relays
dition, the reception of the endaoÍ-message signal by se
§-UNA and .ii-BKA. Relay ’_i-BKA released, de-ener
quential selector 552 restores it to the “select” condition
gizes lamp 521; relay S-UNA released, de-energizes lamp
and momentarily opens contacts S55 to release relays
35 5L?, and releases relay S-LUA as previously described.
S-UNB and S-BKB.
The release of relay 5-LUA de-cnergizes lamp Sl‘î and
Relay S-BKB released, extinguishes lamp 571. Relay
releases relays Il-FZR and S-AL and relay S-AL in
S-UNB released, releases relay S-LUB which extinguishes
turn releases relay S-AR as previously described.
lamp 567 as previously described. The release of relay
The release of relay ÃFFZL opens the discharge path
S-LUB releases relays 3-FZR and 5~AL and relay 5«AL
‘ill of capacitor db2 and tube lilla tires, operating relay
in turn releases relay S-AR as previously described.
fi-SMl which in turn releases relay S-TRA as previously
When tube alla subsequently lires to operate relay
described. With relay .Qi-TRA released, trunk 2Go re
‘lf-SML relay B-TRB releases as previously described.
The connection between line 203 and trunk 2&7 is now
released, line 293 is on “skip” and the circuit is restored
to the initial condition.
In the event that the trunk circuit opens during trans
mission thereto, the appropriate break lamp S21 or 57i
sumes pol-ling for message material.
lt may be desirable to set up various line-to-trunk
connections sending the end-of-rnessage signal to put
sequential selectors in the “select” condition. ln order
to connect trunk 2% to the various lines, the attendant
ñrst operates hold key SlZ completing a path by way of
the break contacts of contacts S-TRA and S-HDA and
operates the armature of relay Z-LItA to its spacing con
tacts whereby contacts ‘5% momentarily close to operate 50 the winding of relay 3-HDA to battery, operating relay
3-HDA which locks by way of the make contacts of
relay S-BKA as previously described. Relay 5-BKA op
contacts ÈLHDA and break contacts ê-FZR. Relay
erated, energizes lamp @2l and operates relay E-AL which
S-HDA operated, completes a discharge path for capac
in turn energizes buzzer älä as previously described.
itor 492 by way of make contacts ,E4-HBA precluding the
Returning now to relay S-BKA operated, the connec
operation of tube elle.
tion between line 2G52 and trunk 2% is opened and relay
To connect the appropriate line to trunk 2do, the
2-LA is operated to its marking contact as previously
is energized. The opening of trunk 2%, for example,
described. Relay Z-LlA, however, does not respond t0
the marking signal since trunk Ztlá is open. The attend
ant may (le-energize buzzer .alti at this time as previously
described.
With lamps 521 and
energized, indicating an open
trunk condition, the attendant releases line ZtlZ by oper
ating and releasing skip key
The operation of skip
key all@ releases relay 4-TA2 as previously described and
relay d-TAZ released, de-energizes lamp 5u@ and releases
the connection of line 292 to trunk Zlio. The subsequent
release of skip key ¿ib? renders linne 202 available to
polling by trunk Ztl’î. Trunk Zito, however, is held since
relays :"i-UNA and ß-TRA are operated.
attendant repeatedly operates selector key @l2 until the
wipers of stepping switch ¿tile are on the appropriate
position to operate the desired Ll~TA relay which relay
in turn energizes the appropriate lamp such as lamp Etl‘l',
for example, and connects line 2M; to trunk 2%.
The end-of-inessage signal is sent to the trunk and the
desired line by momentarily operating clear key 3l?.
which in turn operates relay Íi-PZL as previously
described. Relay SJEZL operated, completes a path
from battery by way of the winding of relay S-SGA, the
make contacts of contacts S-FZL, the break contacts of
contacts S-TRA and make contacts S-HDA to ground,
operating relay :"f-SGA. ‘With relay S-SGA operated,
ln the event trunk 2% opens or goes spacing when 70 distributor 3i?? is connected in series with relay E-LA
and the appropriate line circuit. Distributor Btl? now
a message is not being transmitted thereto, the armature
proceeds to send the end-oi~message signal in the same
of relay ÍZ-LlA is operated to its spacing contact whereby
manner as previously described.
sequential selector S62 reads a double blank. Contacts
During the transmission or the first character in the
5% are thereby momentarily closed to operate relay
:'S-BKA as previously described. ln addition, the recogni 75 message signal, contacts
of sequential selector S92
3,078,336
18
17
momentarily close whereby relay S-UNA operates as
previously described. Relay 5-UNA in turn locks the
operated one of the liv-TA relays and energizes lamp 512.
Near the termination of the transmission of the end
Near the termination of the transmission of the end
oi-message signal, relay 3-FZR operates, releasing relays
S-FZL, 3-HDB and 3-C1 through 3-C8 as previously
described. Relay 3-C8 in turn releases relay S-FZR and
of-message signal, relay E-FZR operates, releasing relay 5 relay S-FZL releases relay 3-SGB. Relay 3-HDB re
leased, completes the previously-described operating path
3~FZL and relays S-Cl through 3-(28 as previously
for relay â-TRB.
described. In addition, the release of relay 3-FZR opens
The reception of the end-of-message signal by se
the previously-described locking path for relay 3-HDA
quential selector 552 releases relay S-UNB and relay
and this relay releases. The release of relay â-CS opens
the previously-described operating path for relay S-FZR,
releasing the relay.
S-UNB in turn releases lthe operated one of the 4-TB
relays whereby the connection of trunk 207 to the con
nected line circuit is released. With relays 3-FZL and
Relay S-FZL released, opens the previously-described
operating path for relay S-SGA and this relay releases.
3~HDB released, the previously-described discharge path
Relay S-HDA released, completes the previously
described energizing path for relay I’i-TRA, operating
for capacitor 462 lis open and tube 404 retires, operating
relay /l-SMI. Relay 4-SM1 operated, releases relay
the relay.
S-TRB as previously described.
`rl‘he transmission of the end-ot-message signal momen
tarily opens contacts 565 releasing relay S-UNA which
in turn de-energizes lamp 5152 and releases the operated
one of the ‘LTA relays. The release of the fil-TA relay
opens the line-to-trunk connection and de-energizes the
line lamp such as lamp 567, for example.
Returning now to the release of relays S-HDA and
the initial condition and can resume searching for mes
sage trailic.
t
S-FZL, the previously-described discharge paths for
What is claimed is:
l. In a telegraph switching system, a central station,
a plurality of transmission lines extending from said cen
capacitor 4tl2 by way of the make contacts of relays
S-FZL and S-HDA are open whereby tube riti-d retires,
operating relay e-SMl. Relay A-SMl operated, releases
relay .çi-TRA, as previously described, whereby the cir
cuit is restored to the initial condition and trunk 2do
may resume searching for message material.
ln the event it is desired to hold trunk 296 out of
the circuit, the busy key comprising normally open con
The circuit is now in
Although »a speciñc embodiment of the invention has
been shown and described, it will be understood that
various modifications may be made without departing
from the spirit of this invention and within the- scope
of the appended claims.
tral station, each of said transmission lines extending
to at least one outlying station, each of said outlying sta
tions including a telegraph transmitter selectively started
30 1oy the impression of a transmitter-start oode signal on
said line, a plurality of outgoing trunks extending from
said central station, means for generating said start code
The closure of contacts
signals, sequentially operating means for coding said
313 completes an obvious energizing path for relay
start signals of each of said outlying stations on said
iii-TRA whereby the previously-described operating paths
generating means, one at a time and in rotation, means
for the ¿_T/‘s relays are opened. rlihe closure of con
tacts M3 applies shunting ground around make contacts
associated with each of said trunks and responsive to
said sequentially operating means for registering a de
tacts 313 and 4X3 is operated.
signation of said line extending to said outlying station,
S-UNA in the previously-described discharge path for
means responsive to said registering means for selec
capacitor 462. Accordingly, the Li-TA relays cannot
operate, whereby trunk 266 is unable to poll the line 40 tively connecting said associated trunk to said designated
line, means responsive to said connecting means for
stations. In addition, in the event that trunk 267 starts
impressing said start signals on said designa-ted line,
a station transmitter, relay S-UNB operates to complete
means responsive to the starting of said outlying station
a discharge path for capacitor 462 by way of make
transmitter on said designated line for maintaining said
contacts S-UNB and contacts M3, terminating the oper
45 registration, means responsive to said maintained registra
ation of tube 404.
tion of said associated registering means for disabling
In the event it is desired to hold trunk 2il7 out of the
said associated registering means, further means respon
circuit, the busy key comprising make contacts 314 and
sive lto said maintained registration of said associated
¿i14- is operated. Accordingly, when trunk 2% starts a
registering mean-s for precluding the subsequent designa
station transmitter, the discharge path for capacitor 402
iscompleted by way of normally open contacts 414 and 50 tion of said designated line by other ones of said register
ing means, means responsive to maintained registrations
make contacts S-UNA whereby the circuit operation is
of all or" said registering means for disabling said sequen
terminated until trunk 2do can resume polling for message
tially operating means, and means responsive to the
material.
termination of the operation of said outlying station
If it -is desired to send the end-ot-message signal to
trunk 2M, busy key comprising contacts 313 is operated 55 transmitter for removing said maintained registration of
said associated registering means.
to operate relay ZS-TRA and hold trunk 206. Hold key
2. In a telegraph switching system, a central station, a
3112 is then operated, completing a path from ground
plurality of transmission lines extending from said cen
by way of normally open contacts 312, the make contacts
tral station, each of said transmission lines extending vto
of contacts S-TRA, the break contacts of contacts
â-HD'B and vthe winding of relay 3-HDB which locks by 60 at least one outlying station, each of said outlying sta
tions including a telegraph transmitter selectively started
way of the make contacts of contacts B-HDB and break
by the impression of a transmitter-start code signal on
contacts 3-FZR. Relay S-HDB operated, completes an
obvious discharge path for capacitor 462, terminating
the polling cycle. Clear key 311 is subsequently operated
whereby relay 3-FZL operates. The operation of re
lay ?a-FZL completes a path from battery by way of the
winding of relay S-SGB, the make contacts of contacts
S-FZL, break contacts S-TRB, the make contacts of
said line, a plurality of outgoing trunks extending from
l said central station, means for generating said start code
signals, sequentially operating means for coding said
start signals of each of said outlying stations on said
generating means, one at a time and in rotation, means
associated with each »of said trunks and responsive to
said sequentially operating means for registering a desig
tion of relay S-SGB connects distributor 397 in series 70 nation of said line extending to said outlying station,
means responsive to said registering means for selectively
with relay Z-LB and the end-of-message signal is sent
connecting said associated trunk to` said designated line,
to sequential selector 552 in the same manner as previous
means responsive 'to said connecting means for impressing
ly described. The -lirst character ot the end-of-message
said start signals on said designated line, means respon
signal momentarily closes contacts S54, operating relay
sive to the starting of said outlying station transmitter on
5*-UNB.
contacts S-TRA `and make contacts S-HD‘B. The opera
3,078,336
E@
said designated line for maintaining said registration, and
quentially operating means for registering a designation
of said line extending to said outlying station, means re
sponsive to said registering means for selectively connect
ing said trunk to said designated line, and means re
subsequent designation of said designated line by other
sponsive to said connecting means for impressing said
ones of said registering means.
start signals on said designated line.
3. In a telegraph switching system, a central station,
7. In a telegraph switching system, a central station,
a plurality of transmission lines extending from said cen
a plurality of transmission lines extending from said cen
-tral station, each of said transmisison lines extending to
tral station, each of said transmission lines extending to
at least one outlying station, each of said outlying stations
including a telegraph transmitter selectively started by the 10 at least one outlying station, each of said outlying stations
including a telegraph transmitter selectively started by
impression of a transmitter-start code signal on said line,
the impression of a transmitter-start code signal on said
a plurality of outgoing trunks extending from said central
line, an outgoing trunk extending from said central sta
station, means for generating said start code signals,
tion, means for generating said start signals, sequentially
sequentially operating means for coding said start signals
operating means for coding said start signals of each of
of each of said outlying stations on said generating means,
further means responsive to said maintained registration
of said associated registering means for precluding the
one at a time and in rotation, means associated with each
said outlying stations on said generating means, one at a
time and in rotation, means responsive to said sequentially
operating means for registering a designation of said line
ing means for registering a designation of said line ex
extending to said outlying station, means responsive to
tending to said outlying station, means responsive to said
registering means for selectively connecting said asso 20 said registering means for selectively connecting said trunk
to said designated line, means responsive to said connect
ciated trunk to said designated line, means responsive to
ing means for impressing said start signals on said desig
said connecting means for impressing said start signals
nated line, means responsive to the reception of signals
on said designated line, means responsive to the starting
from said designated line for maintaining said registration,
of said outlying station transmitter on said desigated line
for maintaining said registration, and means responsive to 25 and means responsive to said maintained registration for
disabling said sequentially operating means.
said maintained registration 0f said associated registering
8. In a telegraph switching system, a central station,
means for disabling said associated registering means.
a plurality of transmission lines extending from said
4. In a telegraph switching system, a central station,
central station, each of said transmission lines extending
a plurality of transmission lines extending from said cen
tral station, each of said transmission lines extending to 30 to at least one outlying station, each of said outlying
stations including a telegraph message transmitter selec
at least one outlying station, each of said outlying stations
tively started by the impression of a transmitter-start
including a telegraph transmitter selectively started by the
code signal on said line, an outgoing trunk extending
impression of a transmitter-start code signal on said line,
`from said central station, means for generating said start
a plurality of outgoing trunks extending from said central
station, means for generating said start code signals, 35 signals, sequentially operating means for coding said start
signals of each of said outlying stations on said generat
sequentially operating means for coding said start signals
ing means, one at a time and in rotation, means respon
of each of said outlying stations on said generating means,
sive to said sequentially operating means for registering
one at a time and in rotation, means associated with each
a designation of said line extending to said outlying sta
of said trunks and responsive to said sequentially operat
of said trunks and responsive to said sequentially Operat
tion, means responsive to said registering means for
selectively connecting said trunk to said designated line,
tending to said outlying station, means responsive to said
means responsive to said connecting means for impressing
registering means for selectively connecting said asso
said start signals on said designated line, means respon
ciated trunk to said designated line, and means responsive
sive to the reception of a message from said designated
to .said connecting means for impressing said start signals
on said designated line.
45 line for maintaining said registration, means responsive
to said maintained registration for disabling said sequen
5. In a telegraph switching system, a central station,
tially operating means, and means responsive to the
a plurality of transmission lines extending from said cen
termination of said message for removing said main
tral station, each of said transmission lines extending to
tained registration.
at least one outlying station, each of said outlying stations
including means selectively responsive to control signals, 50 9. In a telegraph switching system, a central station,
a plurality of outgoing trunks extending from said central
a plurality of transmission lines extending from said cen
station, means for generating said control signals, sequen
tral station, a plurality of outgoing trunk lines extending
tially operating means for coding said control signals of
from said central station, means common to said trans
each of said outlying stations on said generating means,
mission lines for generating control signals, means asso
one at a time and in rotation, means associated with each 55 ciated with each of said trunks and responsive to the
of said trunk and responsive to said sequentially operating
idle condition of said associated trunk for extending said
means for registering a designation of said line extending
associated trunk to a selected one of said lines, further
to said outlying station, means responsive to said register
means associated with each of said trunks and responsive
ing means for selectively connecting said associated trunk
to said extending means for seizing said generating
to said designated line, means responsive to said connect 60 means, _and means responsive to said seizing means for
ing means for impressing said control signals on said
impressing said control signals on said selected line.
designated line, and further means responsive to said
10. In a telegraph switching system, a central station,
registration of said associated registering means for pre
a plurality of transmission lines extending from said
cluding the subsequent designation of said designated line
central station, each of said transmission lines extending
-by other ones of said registering means.
65 to at least one outlying station, each of said outlying
6. In a telegraph switching system, a central station,
stations including .a telegraph transmitter selectively
a plurality of transmission lines extending from said cen
started by the impression of a transmitter-start code signal
tral station, each of said transmission lines extending to
on said line, a plurality of outgoing trunk lines extending
at least one outlying station, each of said outlying stations
from said central station, means common to said trans
including means selectively responsive to control signals, 70 mission lines for generating said transmitter-start code
an outgoing trunk extending from said central station,
signals, means associated with each of said trunks and
means for generating said control signals, sequentially
responsive to the idle condition of said associated trunk
operating means for coding said control signals of each
for extending said associated trunk to a selected one of
of said outlying stations on said generating means, one
said lines, further means associated with each of said
at a time and in rotation, means responsive to said se 75 trunks and responsive to said extending means for seizing
ing means for registering a designation of said line ex
3,078,336
21
"
said generating means, and means responsive to said
seizing means for impressing said transmitter-start code
signals on said selected line.
l1. In a telegraph switching system, a central station,
a plurality of transmission lines extending from said
central station, each of said transmission lines extending
22
each of said trunks and responsive to said extending
means for seizing said generating means, means responsive
to said seizing means for impressing said transmitter-start
code signals on said selected line, and means responsive
to the starting of an outlying station transmitter on said
selected line for releasing said generating means and pre
cluding the extension of other ones 0f said trunks to
to at elast one outlying station, each of said outlying
said selected line.
stations including a telegraph transmitter selectively
started by the impression of a transmitter-start code
References Cited in the ñle of this patent
signal on said line, a plurality of outgoing trunk lines 10
UNITED STATES PATENTS
extending from said central station, means common to
said transmission lines for generating said transmitter
`2,088,750
Kinkead ______________ __ Aug. 3, 1937
start code signals, means associated with each of said
2,474,257
Klienschmidt _________ _.. .Tune 28, 1949
trunks and responsive to the idle condition of said asso
Anspach et a1 _________ _.. Apr. l1, 1961
ciated trunk for extending said associated trunk to a 15 2,979,556
selected one of said lines, further means associated with
3,022,372
Votaw ______________ __ Feb. 20, 1962
Документ
Категория
Без категории
Просмотров
0
Размер файла
2 292 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа