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Патент USA US2412955

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A
Dece 24, 1946.
w. M. BAcoN ET AL
2,412,955
TELEGRÀPH SWITCHING SYSTEM
Filed Sept. 18,- 1945
16 Sheets-Sheet >l
Dec. 24, 1946.
w. M; BACON ETAL
2,412,955
TELEGRAPH swITcHme SYSTEM
Filed Sept. 18, 1943
16 Sheets-Sheet 2
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ATTORNEY
Dec. 24, 1946.
w. M. BACON ET AL
2,412,955
TELEGRAPH SWITCHING SYSTEM
Filed Sep‘l’..~ 18, 1943
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TELEGRAPH SWITGHING SYSTEM~
Filed Sep‘l'..` 18, 1943
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TELEGRAPH- SWITCHING SYSTEM
Filed Sept. i 18, 1943
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Dec. 524„~ 1946.
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Dec. 24, 1946.
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TELEGRAPH SWITCHIÑG SYSTEM
Filed Sept. 18, 1943
16 Sheets-Sheet 15
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INVENTORS. WR YOUNG JR'
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l2,412,955
Patented Dec. 24, 1946
UNITED STATES PATENT OFFICE
2,412,955
TELEGRAPH SWITCHING SYSTEM
Walter M. Bacon, New York, N. Y., and William R.
assignors to Bell
Young, Jr., Summit, N. J.,Incorporated,
New
Telephone Laboratories,
York, N. Y., a corporation of New York
Application September 18, 1943, Serial No. 502,944
17 Claims. (Cl. 178-4)
1
2
transmission over the outgoing line to which they
have been directed.
A feature of this invention relates to switching
circuits and apparatus which will select an out
going line if that line is idle and alternatively
This invention relates to communication sys
tems and more particularly to automatic tele
graph switching systems in which messages are
automatically directed and routed to stations oi
ultimate destination under control of certain
and automatically select a storage device and
predetermined signals or code combinations usu
transmit messages thereto if the line had been
ally preceding each message.
previously selected by the selecting equipment and
The object of the present invention is to provide
a message is in the process of being transmitted
an improved telegraph system employing less ap
’
paratus than comparable systems of the prior art 10 thereover.
In addition, the system is arranged to provide
and at the same time expediting the transmis
numerous other tests, alarm, and other features
sion of messages through the system.
as disclosed in said above-identified application of
In accordance with an exemplary embodiment
Branson‘et al., all these being incidental to mes-_
of the invention, the system disclosed in United
sage transmission and in the nature of auxiliary
States patent application. of Branson et al., Serial 15
apparatus.
No. 448,878, ñled June 27, 1942*, has been improved
_ The foregoing objects and features of the pres
in order to expedite the transmission of messages
ent invention, the novel features of which are
through the system and at the same time require
speciñcally set forth in the claims appended here
less apparatus and hence less sources of trouble
to, may be more readily understood from the
and less equipment to maintain, thus improving
following description when read with reference
the service and at the same time reducing the cost
to the attached drawings in which:
per message. In accordance with the system dis
Fig. 1A shows the manner in which Figs. 2, 3
closed in said Branson et al. application, messages
are transmitted from outlying stations to a cen
and 4 should be arranged adjacent one another
to show in outline form the various circuits and
tral switching station. At the central switch
equipment of an exemplary system in accord
ing station the messages intended for other out
ance with the present invention as well as illus
lying stations are stored in a tape by means of
trate the routes of messages through the system;
a reperforator. The tape then controls the trans
Fig; 1B shows the manner in which Figs. 5
mitter which transmits the message through se
lective switching equipment to a second reper 30 through 17, inclusive, should be arranged adja
cent one another to show the circuit arrange
forator associated with a line extending towards
ments
in detail of one exemplary form of the
the station of ultimate destination of the message.
invention;
Thereafter the second tape controls a transmitter
Figs. 2, 3 and 4 show in outline form a typical
'which transmits the message over the line' ex
_system embodying the present invention; and .
tending towards the station of ultimate destina
Figs. 5 through 17, inclusive, when arranged
tion.
'
as shown in Fig. 1B, show in detail the various
In accordance with the present invention the
circuits and equipment comprising‘and‘cooperat
second storage of the message is dispensed with
ing
with the present invention.
except when the line extending towards the sta
Referring now to Figs. 2, 3 and 4 when ar
tion of ultimate destination is employed for the
ranged as shown in Fig. 1A, Fig. 2 shows two
transmission of another message over' that line.
typical
party lines and the station and _control
Hence during periods of light trañic the messages
equipment associated therewith. One party line is
are not stored a second time. Instead the mes
designated 2 I0 which comprises a receiving chan
sages are immediately transmitted over the line
nel 2l i and a transmitting channel 2 I2. Similarly,
extending towards their stations of ultimate des
party line 260 comprises a receiving channel 26|
tination. However, when the trailìc over the line
and a transmitting channel 262. Both trans
becomes heavier many messages will be directed
mitting
and receiving channels are illustrated in
to a storage device associated with said line. Thus
Fig. 2’ and also Fig. 3 by means of telegraph lines
during a considerable portion of the time the sec
or conductors. It is to be understood, however,
ond storage of the message is dispensed with as
that these lines or channelsmay include any
well as the equipment necessary for accomplish
ing this second storage. However, when the line
'becomes more heavily loaded as is usual during
certain hours of the day many of the messages will
type 0f telegraph transmission equipment nor
mally employed for the transmission of telegraph
signaling pulses or code combinations of pulses. .
_be stored a second time and` await their turn for 55 These lines> or channels may, for example, include
2,412,955
3
4
open wire lines, cable lines, channels of voice
frequency or high frequency carrier current sys
tems, radio systems, time division multiplex sys
tems or telegraph channels of composite tele
phone and telegraph transmission systems or
of any other type of pulse transmission chan
for stations connected to these other lines may be
recorded at station 2|9 and later automatically
transmitted over the proper line without requir
ing the time of an operator to retransmit the
Cil
nels or systems suitable for the transmission of
signaling pulses such as employed in telegraph
the attendant or subscriber at the outlying or way
stations perforates messages in paper tapes for
systems. The various party lines and channels
thereof may include or comprise any or all of the
foregoing types of transmission systems or any
or all combinations of such types of transmission
systems.
later transmission over the system. Preceding
each message, an address or group of switching
signals is perforated in the tape and following
each message an end-of-message or disconnect
>
signal is also perforated in the tape. Following
The transmission systems of the various types
comprising the party lines operate in their usual
the end-of-message signal the subscriber may
perforate any address signal followed by another
message intended for the station designated by
the address. Following this message and each of
the messages, the operator will then perforate a
and Well-understood manner so a description of
the operation thereof need not be included here
in because it would serve no useful purpose and
only tend to obscure the other elements and fea
tures of the present invention.
disconnect signal in the tape. Furthermore, the
_
20 operator or attendant will usually perforate an
Each of the party lines shown in Fig. 2 extends
end-of-transmission signal in -the tape after the
disconnect signal following the last message
to a plurality of outlying subscriber or Way sta
tions. It is to be understood also that it is with
in the scope of this invention to extend lines
available for transmission from the station then
transmitting.
individually from one or more of the outlying sta
tions to the central switching exchange. In .this
case certain of the control equipment associated
with each of the party lines need not be provided
as will be readily apparent .to those skilled in the
art.
The attendant or operator at the outlying sta
tion will then insert a tape in the transmitter for
transmission over the system. At a later time
the transmitter is started under the control of an
operator or switching circuits at the central
30 switching station. Thereafter the messages are
‘
Each of the lines which extends to more than
transmitted to the central ,switching station and
one outlying station is provided with control
equipment located at or near the outlying sta
tions of the party line. Control equipment may
be provided which is individual to each of the out- ‘
lying or way stations in case the way stations
are rather widely separated or the control equip
ment may be provided common t0 a group of out
lying stations which are `located more closely to
gether. In addition, certain of the control equip
ment may be individual to certain outlying sta
tions, while other control equipment provided for
times referred to as a secondary switching cen
equipment is provided at the other stations. In
-addition, -station 2I9 is provided with a receiving
recorder or reperforator for again perforating
‘tape in accordance with messages received from
«the system. This reperforator is provided at
'those stations at which other telegraph lines or
circuits terminate so that the messages intended
lays 4l3 and a director circuit 4|4. Fig. 4 also
shows a miscellaneous intercept circuit 421 and
Each of the party lines terminating at the
>centers 2|3, 2|4 and 2|5. The control equipment
2|4 is individual to station 2l9. Control equip
ment 2|5 is common to stations 2 i6, 2|1 and. 218,
-while control equipment 2l3 is common to sta
tions 225 to »224, inclusive. Each of the outlying
stations is provided with a receiving instrument,
and the keyboard Vperforator is illustrated dia- >
ter and transmitting distributor 4I2, control re
the willful intercept circuit.
ing and control circuits or secondary Yswitching .
grammatically and‘designated 22,5 in Fig. 2, the
transmitting distributor is designated 235, while
the con-trol equipment is designated 236. Similar
tion comprising a keyboard perforator 4H, a
monitoring receiving instrument 4|0, transmit
a repeating instrument 420 comprising a re
corder or reperforator 42| and a transmitting de
`vice 422. A director 423 is also associated with
ter, are associated with each of the party lines.
For example, party line 2 l 0 extends to the switch
trolled transmitter for transmitting signals in
accordance with the perforations in the tape. For
example, at station 2|6 the receiving instrument
originating position at the central switching sta
a receiving reperiorator 426 and a tape recep
of the outlying stations.
As shown in Fig. 2, three separate and distinct
sets of switching and controlling circuits, some
with the signals to be transmi-tted and a tape con
recorded thereat.
The circuits at the central switching station
are illustrated in Figs. 3 and 4. Fig. 4 shows the
tacle 425. A willful intercept circuit 424 is also
shown. This intercept circuit is provided with
the same party line may be common to a plurality
transmitting equipment, and control equipment.
In the specific system described herein, the trans
mitting equipment comprises a keyboard per
forator for perforating paper tape in accordance
message.
In order to transmit messages over this system,
switching oiìce or center is provided with an in
coming line circuit 322 and a receiving only ma.
chine 323, a storage repeater 324 and associated
transmitter 325. Incoming line circuit 322
causes the messages intended for the central
switching station to be recorded on the receiving
only receiver 323 and causes the messages intend
ed for other stations of the system to be re
corded by the reperforator 3_28. Director circuit
327 is associated with the transmitter 325 and
60
serves to connect the transmitter 325 selectively
to any of the lines terminating at the central
switching station under control of the address
characters preceding each message.
Each of the party lines is also provided with
transmitter start circuits, such as 3|0, and out
going line circuits and equipment for transmit
ting messages over the party line. The outgoing
line circuit associated with party line 2 I0 incor
porates control circuits and equipment in ac
cordance with the present invention as will be de
scribed hereinafter. Brie?ly, messages directed
to stations of party line 2l I are transmitted either
directly over the party line or to storage re
peaters associated with line 2li under control of
Athe director circuits individual to the lines upon
2,412,955
5
which the messages originate for later transmis
sion over the outgoing lines.
' Figs. 2 and 3 also show a trunk circuit 290 com
prising two transmission channels 29| and 292
extending to' a distant switching center 295. The
terminal equipment associated with the trunk
circuits is similar to the terminal equipment as
sociated with each of the party lines as described
above.
The operation of the various circuits referred
to above is described in detail-in the above-iden
tified copending patent application of Branson
et al. Since the respective circuits referred to
above forming parts of the systems referred to
herein operate in substantially the same manner
as described above in said patent application of
Branson et al., which patent application has
6
manner of cooperation between the various cir
cuits may be more readily understood.
In the exemplary system shownin Figs. 2, 3
and 4 only one line of each of the different types
oflines disclosed‘in the above-identified appli
cation of Branson et al. is indicated. It is to be`
understood, however, that any number of the var-V
ious types of lines and their associated equipment
may be provided as are required by any one or
more of a number of different conditions and
requirements encountered in any specific instal-.
lation. Likewise equipment associated with only
one of the lines is shown modified in accordancev
with the present invention in Figs. 2 through 4,
inclusive. It will be readily apparent to those
skilled in the art, however, that the equipment
associated with any one or more of the lines may
readily be modified in accordance with the pres
been made a part hereof as if fully included
ent invention. The amount of equipment and
herein, an elaborated description has therefore
20 the number of lines and the features provided on
not been repeated here.
each line will vary depending upon the circum
Reference will now be made to Figs. 5 through
stances of each installation. However, lines
17, inclusive, when arranged as shown in Fig. 1B.
equipped in accordance with the present inven»`
Fig. 5 shows the subscribers’ stations and con
tion will cooperate with all the other lines of such
trol equipment associated with party line 2H).
an exemplary system.
The subscribers’ stations and control equipment
Likewise Figs. 5 through 17, inclusive, show
associated with party line 2H! are shown in sub
in detail the circuits associated with only one
stantially the same form as shown in Fig. 2.
of these lines. It will be'readily appreciatedv by
In addition, the same reference numerals have
persons skilled in the art, however, that the
been employed to designate stations and equip
equipment disclosed in these ñgures may be
ment. Details of typical party lines of this type 30 duplicated for additional lines and it may be
are described in the above copending application
incorporated without involving invention in- any
of Branson et al. and also in a patent application
of the other types> of line circuits disclosed in
of Krecek et al., Serial No. 408,406, iìled August
said copending applications.
`
28, 1941, which was issued on January 9, 1945
Assuming now by way of example that it is
35
as Patent 2,366,733, the disclosures of which are
desired to transmit a message from station 2|6
hereby made a part of this specification as if fully
to station 222. The attendant at station 2l6 will
included herein. Inasmuch as the equipment in
perforate the address or switching codes AG one
the circuits at the> subscribers’ stations as well as
or more times in the tape preceding the message.
the control circuits therefor operates in substan
tially the same manner as described in the above 40 The attendantv will then perforate the message
identified copending applications, detailed oper
in
the
tape
after
which
a
disconnect
or
end-of-message signal comprising a figures
signal is followed by an H signal and this in turn
, Fig. 5 also shows transmitter start circuit 310
is followed by a letters signal. The attendant
as well as the incoming line circuit 322. As de
scribed above, incoming messages intended for if) may perforate additional messages in the tape
each preceded by proper address code or signals
the central switching center are directed to the
and each followed`by an end-of-message group
receiving only machine H56, while messages in
of code combinations. After a predetermined
tended for other stations of the system are re
number of messages have been perforated in the
corded by the reperforator H02.
tape the attendant will perforate an end-of-`
Inasmuch as the circuits and equipment at the »
transmission group of codes in the tape. There
outlying stations and the control thereof in the
exemplary system disclosed herein operate in the
after the tape will be inserted in transmitter 235.
same manner as described in the above-identified
At a somewhat later time the transmitter will
be started into operation in response to the op
applications of Branson et al. and Krecek et al.,
they have been shown only in outline form and
eration of the transmitter start circuit 3I0 at
a detailed description of their operation will not '
the central switching station. Transmitter 235
be repeated here. Likewise the transmitter start
will then transmit the address codes followed by
circuit 3 l 0 as well as the incoming line circuit 322
the message over the transmitting channel ~2I2
has been shown only in outline form since these
of party line ZIB.
,
circuits operate in substantially the same manner
The operation of the equipment at the central
and cooperate with the other circuits in a similar
station including the incoming line circuit 322
ation of these circuits will not be repeated here.
manner to the manner described in said Branson
et al. application. Consequently the detailed de
scription of the operation of these circuits need
not be repeated since this information may be ob
tained by reference to the applications above
identified and incorporated herein. However, in
asmuch as the director circuit cooperates with
the outgoing line circuit in a novel manner and
inasmuch as the outgoing line circuit has been
materially modified, an exemplary form of these
circuits is shown in detail in Figs. 5 through 17,
inclusive, and the operation of these circuits will
be’described in greater detail in order that the
in cooperation with the receiving printer H56
and the reperforator ,I |02 and the associated cir
cuits in response to the address codes AG preced
ing the message causes the message to be directed
to the selector magnet H03 of the reperforator
HB2. Magnet H03 in turn causes the message
to be printed upon and perforated in tape H05.
The reperforator H02 is arranged to cooperate
with the transmitting instrument shown in Fig.
11 so that the transmitting equipment shown in
Fig. 11 will transmit the last character recorded
inthe tape H05. The details of such a trans
operation of the improved circuits _as well as theV 75 mitter andreperforator are shown andV described
7
2,412,955,
in the above-identified application of Branson
et al. incorporated herein and therefore need, not,
be repeated here.
Upon the reception'of the address codes A and
G by the reperforator I I 0'2 the increase in supply
of tape between the reperforator and the sensing
head H00 of the transmitter will cause the sens
ing head H06 to be rotated in a clockwise di
rection as seen in Fig. l1 thus permitting con
tacts H2I to close. The closing of contacts H2I
completes a circuit for the operation of relay I 3| 6.
Relay |3I6 in turn completes circuits for the op
eration of relays I3H, I3I'I, I32I and I2I8. The
operation of relay I3 I 6 also completes a circuit for
the operation of the transmitter magnet IIII.
The circuits for the operation of the above relays
and magnet are traced in detail in the above
identified application of Branson et al. and need
not be repeated here. Similarly the circuits for
the setting of the contacts.` controlled by mem-_
bers H09. However, since the contacts I. to 5 0f
the distributor are not connected to any trans
mission circuit at this time, this signal is not
transmitting during the revolution of shaft II5I.
Near the beginning of the revolution of the shaft,
II5I cam H49 causes contacts H50 to close. The
closure of contacts H50 completes a circuit for
the operation of relay H42.
Under certain circumstances the ñrst charac
ters received by the reperforator H02 may be
switching characters which have already per
formed their function, may be disconnect char
acters and certain other characters which are
normally discarded by the switching equipment.
The contacts controlled by members H09 are ar
ranged to complete circuits through them from
ground in response to each of the discard char
acters. As described in the above-identified aD
the operation of various of the other relays to be 20 plication of Branson et al., these discard char
described hereinafter are likewise set forth in
acters include the figures, H, letters and Z code
detail in said Branson et al. application so that
combinations or signals. Upon the operation of
this information will not be repeated at this
relay MI2 if the code combination above the
point.
sensing pins is one of the discard characters, re-The operation of magnet IIII withdraws stop
lay I3I8 is operated. Near the completion of the
latch I'H3 and 'permits shaft H53 to rotate
revolution of the distributor shaft II5I contacts
through one revolution. Near the beginning of
this revolution the tape is advanced through the
H50 reopen at which time relay ISIS operates
and locks operated in series with relay I4I2.
sensing head H06 so that the feeler pins will be
The operation of relay I 318 in response to a
below the next set of perforations in the tape 30 discard character as described above completes a
H05. That is, they will be below the first set of
perforations received by the printing reperforator
permit the feeler pins to sense the tape to de
termine the perforations therein. The pins
circuit for the operation of relay I4I5. Relay
MI5 in operating interrupts the locking circuit
of relay MIS and relay I4I3 releases. Relay I4I3
in releasing interrupts the locking circuit of re
lays I3I9 and MI 2 and permits these relays to
which encounter perforations above them will rise
further as viewed in Fig. I1 than those which do
not find perforations above them. At a later
release which relays in turn cause the slow >re
lease relay I3I8 to release. After a short in
terval of time relay I3I8 will release and cause
time after the arms H01 have been fully posi
relay MI5 to release. The release of relay I 4I5
H02.
Thereafter arms IIO'I are released and
tioned in accordance with the perforations in ‘ ' will again complete a circuit from the transmitter
tape H135 the transfer cam H20 will cause the
transfer members I I 08 to be moved to the left as
viewed in Fig. 11 and engage either the upper
or lower bifurcated end of the arm I I01 and thus
cause the members Heß to be positioned in ac
cordance with the perforations in tape I |05. The
transfer members H08 control intermediate
members HIO having a projection H53 which
engages a switchl controll member H09 which in
turn causes the contacts controlled thereby to
be positioned in accordance with the perforations
in tape H05.
During the revolution of shaft H53 cam IHS
will cause contacts I I I'I to be momentarily closed.
The momentary closing of contacts III ‘I com
pletes a circuit for the operation of relay I4I3
which relay operates and completes a circuit for
release magnet I II I and the above cycle of op
eration is` repeated as long as discard characters
are presented over the feeler pins of the trans
mitter.
Following the discard signals recorded in tape
H05 the address code of the succeeding message
will usually be recorded. As assumed above this
address code is AG. When the letter A _code
combination appears above the sensing pins re
lay E3I8 will not be operated upon the- operation
of relay I 4I2 as described above. Near the end
of the revolution of the distributor shaft II 5I
contacts H50 reopen as described above and per
mit relay ISIS to operate and lock operated in
' series with relay MI2.
With relay ISIB released
and relay IBIS operated a circuit is completed
for the operation of relay I 522.
Relay I 522 in operating _interrupts the operat
maintaining itself operated under control of re
lay MI5. Relay I ¿I3 in operating interrupts the 60 ing of the slow’ release relay I 3H. This relay
does not, however, immediately release since it is
operating circuit of release magnet IIII, thus
a slow release relay and allows time for certain
insuring that magnet I HI will release and cause
of the other relays to function before it releases.
shaft H53 to stop at the end of one revolution.
The operation of ~relai7 ,|522 connects the first
After the contact members I I 09 have had ample
group of fan or coding relays I5I6 to I’52I to the
time to position the contacts controlled by them
contacts controlled by members H09 thus posi
in accordance with the perforations in the tape
tioning
the relays in accordance with the code
H05 contacts III 6 are closed in response to the
combination recorded in- tape H05. Under the
rotation of cam HI8 on shaft H53. Closure 0f
assumed conditions these relays will be positioned
contacts IHS completes a circuit for the opera
in
accordance with the letter A signal.
tion of the distributor release magnet I |41. Mag
The operation of relay |522 completes a cir
net IM‘I releases a distributor shaft II5I for ro
cuit >for the _operation of relay MI5 which relay
tation through one revolution.
operates
and in turn causes the release of relays
During this revolution the transmitting con
MI3 and MI-2 and I3I9. The operation of, re~
tacts I to 5 are closed in sequence for transmit
lay I5I¢5 extends a circuit- from the winding of
ting a signal code combination in accordance with 75 relay
I322 to a sequence circuit |650. When the
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