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Патент USA US2106360

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Jan. 25, 1938.
2,106,360
R. RAYMOND
'
TELEPHONE SYSTEM
Filed June 19, 1935
12 Sheets-Sheet 1
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Jan. 25, 1938.
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TELEPHONE SYSTEM
Filed June 19, 1955
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Filed June 19, 1935
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Jan. 25, ‘1938;
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2,106,360
TELEPHONE SYSTEM
Filed J?ne 19, 1955
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INVENTOR
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Jan. 25, 1938.
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TELEPHONE SYSTEM
Filed June 19, 1935
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Jan. 25, .1938.
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Jan. 25, 1938.
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TELEPHONE SYSTEM
Filed June 19, 1935
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TELEPHONE SYSTEM
Filed June 19, 1955
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ATTORNEY
Jan. 25, 1938.
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TELEPHONE SYSTEM
Filed June 19, 1935
12 Sheets-Sheet 9
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Jan. 25, 1938.
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TELEPHONE SYSTEM
Filed June 19,‘ ‘1935
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TELEPHONE SYSTEM
Filed June 19, 1935
12 Sheets-Sheet 11
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R. RAYMOND
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Jan. 25, 1938.
R. RAYMOND
2,106,360
TELEPHONE SYSTEM
Filed June 19, 1955
12 Sheets-Sheet 12
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Patented Jan. 25,1938
2,106,360
UNITED STATES PATENT OFFICE
2.106.880
TELEPHONE SYSTEM
Ralph Raymond, Nyack, N. Y., assignor to Bell
Telephone - Laboratories, Incorporated, New
York, N. Y., a corporation of New York '
Application June 19, 1985, Serial No. 27,340
24 Claims. (Cl. 179-63)
This invention relates to telephone systems and interval during which the calling subscriber may
more particularly to those systems in which tele
phone connections are established by means of
eautomatically operative selector switches under
5 the control of a sending mechanism common to
a plurality of subscriber’s lines.
,It is the object of the invention to improve
the common sending mechanism to render it
more reliable in operation and less expensive to
10 install and maintain in e?lcient operating con
dition.
Heretofore in sending mechanism of this char
acter such for example as is disclosed in the Pat
ent No. 1,862,549, granted June 14,. 1932 to R.
Raymond and W. J. Scully, switches of the well
known sequence switch type have been employed
for performing certain of the operating func
tions. These switches, of which there are three
in each sender, require the installation of a driv
20 ing motor and power shaft on each sender frame.
Since all of the remaining apparatus of the
sender frame is of the relay type, the elimina
tion of these switches and the substitution there
for of relays to perform their functions would
considerably‘ simplify the maintenance of the
sender and then the entire maintenance of the
sender in good operating condition would be
practically reduced to relay adjustment. The
substitution of relays with their better contacts
for switches having base metal contacts would
give decidedly better circuit operating e?lciency.
In accordance with the present invention re
lays have been provided for performing all of
the functions of the sender, thus eliminating
the sequence switches and the power installa
tion for driving them. More speci?cally a train
of sequentially operating relays is employed in
place of the control sequence switch for con
trolling the selective operations of the selector
switches in accordance with the setting of the
_,
registers of the sender. A group'of transfer re
' lays and impulse generating relays is employed
‘for generating and transmitting codes of im
pulses in accordance with the setting of the
registers of the sender on calls to manual oiilces
equipped with call indicator apparatus and on
calls to tandem o?ices thus replacing a second
sequence switch which formerly performed these
functions and a group of relays is employed for
performing timing functions to replace a third
dial a station’s digit and a delay interval for mak
ing preliminary coin test for the deposit of a
coin if the sender is equipped to serve calls from
subscriber’s line having coin boxes.
. ,
5
A clearer understanding of the invention may
be had from a consideration of the following de
scription in connection with the accompanying
drawings which disclose a complete register send
10
er. In general
Fig. 1 shows the coin test circuits,
‘
Fig. 2 shows the pulse generating relays,
Fig. 3 shows the subscriber class and district
frame recording relays together with certain
general control relays,
1,5
Fig. 4 shows the timing and monitoring cir
cuits,
-
Fig. 5 shows the transfer relays for call indi
cator pulsing, '
,
Figs. 6 and’? show the cross-bar switchv used go
as a dial register,
Fig. 8 shows the incoming recording relays and
the locking relays of the dial register,
Fig. 9 shows the class and compensating re
sistance registers,
Fig. 10 shows the oilice registers,
Fig. 11 shows the selection sequence relays, and
Fig. 12 shows the selection control relays and
the counting relays.
'
This sender is particularly designed to func- 30
tion in a telephone» system employing cross-bar
switches.
Such a system isdisclosed in Patent
No. 2,093,117 granted September 14, 1937 to W.
W. Carpenter, and a general reference is hereby
made to that patent.
85
Ten senders, like the one disclosed, are mounted
on one frame and are associated together in a
group. Of the twenty-nine conductors, by which
the sender is connected to the link circuits, con
ductors 330 to 350 are multipled to all ten send- 40
ers, while conductors 325 to 320 and H2 to H4
are individual to this sender.
-
When the sender is idle, battery is connected
to conductor 325 over the back contact of relay
“0 and the outer right back contact of relay Iii. 45
When a subscriber originates a call, a line switchv
control circuit and a link‘ control circuit are
taken into use and these circuits function to find
a district circuit or junctor which has access to
a group of. senders, preferably containing more 60
sequence switch. The impulse generating re
than one idle sender.~ The calling line is then
lays not only generate codes of impulses for the > connected to the selected district Junctor and
establishment of manual and tandem ‘calls, but
also serve for generating impulses for timing cer
55 tain operations of the sender such as a delay
they sender.
~
.
7
Assuming that the sender disclosed has been
seizedfor service, the link control 'circuitcon- ll
2,106,880
" nects ground to conductor 32]., completing a di
rect circuit for relay 3“, and a circuit for relay
353 to ground at the inner right‘ front contact of
relay 3|‘.
The frame units indication is registered on the
3| 5. Relays ‘3H and H2 connect. conductors ' cross-bar type dial register 800. To indicate the
333 to 349 through to the sender equipment. relationship between the select magnets and the
When the line and link control circuits operate _ switch structure, they have been numbered M0
the line and link switches, the talking conductors to 010 although they appear in Figs. 2 and 3.
With conductor 343 grounded, select magnet 8l3
of the calling line are connected through to con
ductors H2 and “3. Conductor “2 extends to operates, preparing the contacts of the No. 3 level
10 ground over the left normal contact of relay I04 of the register. Magnet 5" also extends its opand the right back contact of relay I01, while erating ground over its local contact, and con
ductor 2" to the winding of relay 8“ and bat
conductor I I3 extends over the right normal con
tact of relay I09, left normal contact of relay I01, tery. Relay 3“ closes a circuit from battery
through the‘winding of the frame hold magnet
conductor _i i5 to battery through the right wind
15 ing of relay 3l0. If the connection over the line ‘|0|, inner back contact of relay "I to ground at
and ,link switches and the subscriber's loop is the outer left front contact of relay 8| I. Mag
complete, relay 3I0 operates, closing a circuit net '|0l operates, closing a locking circuit for
from ground at the inner right back contact of itself through the winding of relay 80i, lower con
relay 303, front contact of relay 3I0,‘ conductor tact of magnet l0l to grounded conductor 353.
20 35I to the winding of relay 8“ and battery. A ‘It also closes a circuit from battery through the
circuit also extends from conductor 35l over the winding of relay 828, left back contact of relay
right back contact of relay 8l5, conductor 82'! to 825, to ground at the upper front contact of mag
the winding of relay 3“ and battery. Relay 314 net ‘l0l. Magnet ‘IOI closes the contacts of crosscloses an obvious circuit for relay 3l3, which in point ‘H2, at the No. 3 level prepared by the op
25 turn connects ground from the inner upper back erated select magnet H3. The cross-point concontact of relay 809, conductor 828, middle right nects ground to conductor ‘H i, which extends over
the outer right back contact of relay 300 and ‘the
front contact of relay 3 i3 to conductor 352, there
by completing a circuit over the front contact of third left contact of relay 3i5 to the winding of
.relay 8“ to battery through the winding of relay relay M5 and battery, locking relay 3i5. _
30 8| 5. Relay M5 at its right armature transfers
When, relay 3|2 released as previously 'described, the ' circuit of select magnet 5l3 was
the circuit of relay 3“ from the ground sup
plied by relay 3i 0 to ground at the contact of opened and that magnet released in turn releas
relay 8l5. Since relay 3" is slow to release, it ing relay 8“ and permitting relay 80| to. operate
maintains its contacts closed during the transfer. in the locking circuit of hold magnet 10!. Cross
35 Relay 3“ connects ground from its inner right point ‘H2 is maintained closed as long as magnet
1
contact through resistance 365, innermost right ‘IN remains operated.
When relay 3“ operated, a circuit was closed
back contact of relay 308, conductor 383, lower
back contact of relay 932 to conductor “4 to from ground at its outer right contact through
condenser 354, left winding of relay 3| 0, outer
control the district junctor.
.
Relay 3l3 in operating, connects battery ‘right back contact of relay 405 to the source of
40
through the winding of relay 3 l 5, over the middle dial tone. A tone is thereby induced in the sub
3l2 over the innermost normal contact of relay
left contact of relay 3l3 and the second lower
contact of relay 3“ to conductor 338 as an indi-'
cation to the link control circuit that the line
45 conductors have been closed. _Ground from the
link control circuit operates relay 3I5 which looks
over its third left contact to ground at the inner
‘ left contact'of relay 3i 3. Relay 3|5 disconnects
battery from conductor 325 to remove the idle
50 indication, and closes at its middle right front
contact a point in the all-senders-busy chain cir
cuit. It also conects ground over its second left
contact to conductor 350 to hold the line and link
switches operated, independent of the line and
In addition it connects
55 link control circuits.
ground over its innermost
lowermost contact of relay
as a release signal to the
Furthermore it opens the
left contact and the
3“ to conductor 339
link control .circuit.
circuit of relay 3l2
5
10
15
20
25
30
35
40
scriber’s dialing circuit and is heard in the sub
station receiver as an indication that dialing may
start.
Call to panel om'ce
45
Assume for the purposes of this description that
the wanted number is Chelsea 3-5678. When the
subscriber dials the ?rst letter C, which is the
equivalent of the digit 2, the circuit of relay 3l0
‘is opened twice, causing relay M0 to close its 50
back contact twice. Relays 8“ and M5 also re
lease. Relay 8l4 is fast both to operate and re
lease in order that it may follow relay “0 as
closely as possible. Relay M5 is also fast to
release.
'
55
At the ?rst release of relay 0“, a circuit is '
closed from battery through the winding of relay
825, back contact of relay 8| 4 to grounded con
ductor 352. Relay 825 operates ‘and is suffi
which releases, opening conductors 340 to 349.
ciently slow to: release to remain operated 60
When the link control circuit releases in response
to the release signal, relay 3“ also releases, open
ing the remainder of the common conductors.
During the time that relays 3H and 3I2 were
65 operated, a registration was made of the class
of service of the calling line and the number of
the district frame involved. This information
is furnished by the link control circuit in the
70 form of ground to one of the class of service leads
throughout the impulsing for the digit, in spite
of the repeated momentary breaking of its op
erating path. Relay 825 in operating, opens the
circuit of relay 828 which releases, remaining re
leased throughout the reception of the digit 65
v 330 to 333, one of the frame tens leads 334 and
335 and one of the frame units leads 340 to 349.
Assuming, for example, that the link control cir
cuit grounds conductors 33l, 335 and 345, relays
impulses.
>
Relays 8l8, 8| 1 and M8 serve to transmit the
dial pulses over conductors 829 and 830 alter
nately to the pulse counting or recording relays
8|! to 824. At its ?rst release, relay 3 l0 connects 70
ground from the inner right back contact of re
lay 300, over the backcontact of relay M0 and
the left front contact of relay 3“ to conductor
355, right back contact of relay 3l8, winding of
75 303 and 301 will operate and lock over conductor relay 8l8 to battery. Relay 8l3 operates, closing 75
3
2,108,860
a circuit from battery through its winding, left
winding of relay 8l8, back contact of relay 8",
iary magnet ‘H8 to battery. Magnet ‘I82 closes
front contact of relay 8l8, over the front ‘contact
of relay 825 or the inner right back contact of
relay 828 to grounded conductor 882. This cir
cuit also extends to grounded conductor 882 over
the outer right back contact of relay 828 and the
normal contacts of relays 8H and M2. Relay
8l8 does not operate, being shunted by the oper
10 ating circuit of relay 8l8. When relay 8l8 re
operates at the end of the first pulse, relay 8l8
operates, closing a circuit from grounded con
magnet ‘H8, through the winding of relay 882,
ductor 352, inner right back contact of relay
826, left front contact of relay 8l8, conductor
838, left back contact of relay 826, right back
contacts of relays 822 and 828, winding of relay
8l8 to battery. Relay 8l8 locks over its inner
right front contact, normal contacts of relays
' 828, MI, 822, 823, M2 and 8“ to grounded con
20 ductor 352, thereby recording one pulse.
Relay 8l8 in operating prepares a circuit from
battery through the winding of relay 8“, right
winding and right front contact of relay 8l8 to
conductor 355.
When relay 3|8 releases in re
. sponse to the second pulse, groundingconductor
355, relay 8l8 is held operated and relay 8"
operates, opening the holding circuit for relay
816 which now releases. At the end of the sec
30
,
60
,
.
70
a locking circuit for itself, and the auxiliary hold ,
upper front contact of magnet ‘I82, outer front
contact of relay 88l to ground. The operation‘
of relay 8“ opened the operating circuit of se- ,
lect magnet 8l2 but that magnet is held over
the locking circuit of relay 8“. Magnet 182 t
closes the cross-point ‘H3 prepared by magnet
M2 and when fully operated opens its normal 10
contact releasing relay 8“ and magnet H2. The
operation of relay 8“ also releases relay 828,
restoring the pulse recording relays, ready for
the next digit. Auxiliary hold magnet 'Il8 closes ’
cross-point 1 ll in the corresponding vertical. ‘In 152
addition magnet ‘H8 closes a circuit from ground
at its front contact through the winding of relay '
885 to battery, opening the dial tone circuit.
It will be observed from the foregoing that the
release of relay 828 is ineffective to operate one
of the select magnets M8 to 8l8 until hold'mage
net 'l8l has been properly operated by ‘the reg
istration of the district frame number and there-'
fore that the ?rst digit dialed cannot be falsely '
registered on the first or frame vertical of the 25
dial recorder.
’
"
=
If a false pulse is transmitted, or the digit on
is mistakenly dialed for the first digit, relays 8l8- _
ond pulse relays 8H and 818 also release closing and 8l8 are operated as above described, in turn ,
a circuit from grounded conductor 852, inner operating relay 8l8. When relay 828 falls back, v30
right contact of relay 826, left back contact of the select magnet circuit is closed as above traced .- Y
relay 8! 8, conductor 829, right back contacts of ‘ to the back contact of relay‘ 824 and thence over
_
relays 823 and MI, outer right front contact of the inner left front contact of relay 8l8 to the- ; '
relay M9, to the winding of relay 828 and bat
winding of the No.1 select magnet 8“. This
tery. Relay 828 looks over its left alternate con
magnet extends its operating ground to‘ the
tact and the normal contacts of relays 8“, 822, winding of relay M2. The locking circuit of re-- ‘
823, M2 and St I to grounded conductor 352. Re
lay 8l2 extends over the front contact of magnet
lay 828 also opens the locking circuit of relay ‘I82 and therefore cannot be closed until after
8l8 so that relay 828 alone of the pulse counting the ?rst digit has been registered. Likewise re
relays remains operated at the end of the digit. _ lay M2 is ineffective to operate magnets ‘I82 and 40’
While relay 3l8 remains operated between digits, ‘"8 since the ground supplied’ to the outer left
relays 8“, M5 and 828 remain operated and re
contact of relay 812 for the purpose of operating - ’
lay 825 releases.
the hold magnets is opened at the front con- ,
The cycle of operations described above for tact of relay 88! and is not reclosed until mag
relays 8I6, 8|‘! and 8l8 repeats for every two net ‘ll8 has closed one of thecross-points in its
pulses of a digit. If the number of pulses is even, vertical. Relay 8l2 opens the holding circuit for
as above, the last pulse leaves the three relays relay 8l8 so that relay 8l8, magnet 6H and relay
normal. If the number is odd, relay 8H is left 8l2 restore‘ in succession and the circuit is in
normal and relays BIG and 8l8 release after re
condition to record the proper digit.
'
lays 8|5 and 826 have reoperated and relay 825
It may also be noted that relay 8l2 is effective 50
has released to break all ground connections to record the ‘digit one on, the framevertical
which could hold them operated. This triple, since a ground for operating the frame magnet
parallel ground serves to establish‘ locking "I is supplied over the back contact of relay 88!.
ground for relays BIG and 8l8 promptly at ,the
‘The second letter of the office code, H, is the
start of each series of pulses and to .hold -"it‘ equivalent of the digit 4 and the relays 8l8, 811. 55
steadily until well after the end of the series.
and 8l8 perform two complete cycles. Relays 8l8
When relay 825 closes its left contact follow
and 828 operate in response to the ?rst two pulses
ing the dialing of the ?rst digit, a circuit is as previously described. After the third pulse
.closed from ground at the upper front contact relays 8H and 8l8 are held operated, grounding ' I.
of magnet 18f, left back contact of‘ relay 828, conductor 888 and closing a circuit over the left 80
left normal contacts of relays 8H and M2, right back contact of relay 828, right back contact of
back contact of relay 828, inner right front con-, relay 822, outer right front contact of relay 828
tact of relay 828 to the winding of select magnet to the winding of relay 82l and battery. Relay
H2 and battery. Magnet 812 operates, prepar
82l locks over its inner left front contact and
ing the No. 2 level of contacts and extends its the normal contacts of relays 822, 823, 8'l2-and
operating ground over conductor M8 to the 8“ to grounded conductor 352, at the same time
winding of relay. 8“ and battery. Relay 8“ opening the locking circuit of relay 828 which recloses a holding circuit for itself over its right leases. At the end of the fourth pulse relays 8l8, front contact, normal contact of hold magnet 8H and 8l8 are normal, connecting ground to
‘I82 and in parallel therewith over the back con
conductor 828, to complete a circuit over the right 70
tact of magnet ‘H8, front contact of relay 88I to back contact of relay 823, outer right front con
ground. At the same time it closes a. circuit tact of relay "I to the winding of relay 822 and
from ground over its outer left contact, inner battery. Relay 822 locks over its inner left front
front contact of relay 88l, upper back contact contact and the normal contacts of relays 823, M2,
of relay 882, windings of magnet ‘I82 and auxil
and 8“ to grounded conductor 882, releasing re 76
4
9,106,880
lay 021. Since this is the 1m pulse of the digit, ' relays 820 and 822. Relay 818 releases relay 823
and locks over the normal contacts of relays 820
relay 828 is released as above described connect
ing ground from the front contact of magnet 10! to 823 as before. Since relay 824_locked inde-'
over the left back contact of relay 825, left nor- . pendently of the other counting relays it re
mal-contacts of relays 812 and 8“, right back mains operated, and when relay 825 releases, the
contact of relay 824, inner right front contact of select magnet circuit extends over the right front
relay 822, to the winding of select magnet 8“ and contact of relay 824 and the outer left front con
battery. Magnet 814 prepares the contacts in tact of relay "9 to the winding of select magnet
the No. 4 level of the switch and extends its op
811. Magnets 811 and 181 and relays 8H and
10 erating ground‘over conductor 218 to the winding -801 cooperate to operate and lock cross-point 10
of relay 8| l. Relay 8“ looks itself and magnet
8 l4 over its front contacts, normal contact of hold
magnet 103, left back contact of relay 813, lower
front contact of relay 802 to ground. At its nor
15 mal contacts it opens the locking circuit of relay
821 and the operating circuit of magnet 814 and at
its outer left front contact closes a circuit from
ground, over the inner front contact of relay 80l,
upper front contact of relay 802, right back con
20 tact ‘of relay 813, back contact of relay 803 to the
winding of hold magnet 103 and battery. Mag
net 103 closes a locking circuit for itself through
the winding of relay 803, front contact of mag
net 108, left back contact of relay v8l3, front
25 contact of relay 802 to ground. When magnet
103 has fully operated it opens the locking cir
cult of relay 8“ and magnet 814. Magnet 103
holds cross-point 620 closed.
In recording the third code digit three, relay
30 82l is operated and locked, and, on the release
of relay 825, operates select magnet 6l3 which
prepares the No. 3 level of ‘contacts. Magnet 613
operates relay 8“ which, since relay 803 is oper
ated, locks under the control of magnet 104 and
35 operates that magnet.
Magnet 104 locks in se
ries with relay 804, locking cross-point 115 and
releases relay 8| I and magnet 6l3.
For the thousands digit 5, relays H9, 820 and
821 are operated and released as before by the ?rst
40 four pulses, the fifth pulse operating relay 823
_ over conductor 830 and the front contact of re
lay 822. Relay 823 locks in a circuit from bat
tery through its winding, back contact of relay
819, inner left front contact of relay 823, normal
45 contacts of relays 812 and 8| 1 to grounded con
ductor 352. Relay 823 also releases relay 822
and when relay 825,falls back operates select
magnet 6I5. Relay 8“, hold magnet 105 and
50
828.
To record the units digit 8, relays 819 to 823
are operated and released and relay 824 locked.
Relays M8 and 820 are reoperated and relay 818
released for the second time. With relays 820 15
and 824 operated, select magnet 618 is operated
and cooperates, with hold magnet 108 to lock
cross-point 824. When the seventh and last digit
has been recorded, hold magnets "I to 108 and
H0 are operated and looked through locking
relays 801 to 808. Magnet 108 in operating closes
a circuit from ground at its lower front contact
through the winding of relay 403 to battery. The
function of relay 403 will be described herein
19 ~21
after.
When the ofllce code had been completely re
ceived, as indicated‘ by the operation of magnet‘
104, the sender is ready to summon a decoder.
For this purpose, magnet 104 closes a circuit
from ground at its lower front contact, conductor 30
889, winding of relay 930, normal contact of re
lay 832, lower back contact of relay 833 to bat
tery. Relay 930 connects battery directly to
conductor 940, and over the normal contact of
relay 93l to conductor 84]. The decoder con 35
nector responds to this signal to connect the
sender with the decoder over a large number of
conductors as indicated. Conductors 940, 941,
810 and 8", and 321 are control conductors.
Conductors 322 to 324 and the conductors shown 40
at the upper left corner of Fig. 6 are for trans
mitting to the decoder the code, subscriber class
and frame identi?cation which has previously
been recorded in the sender. Conductors 944 to
948, 951 to 951 and 961 to -_863 and the group 45
shown on Fig. 10, are for receiving the decoded
information from the decoder. The decoder and
decoder connector function as described in the
relay 805 function to close cross-point 62L _
above identi?ed Carpenter patent.
When the hundreds digit 6 is recorded, the first
five pulses cause the successive operation and re
Since subscriber class relay 303 and frame tens 50
relay 301 were operated, ground is connected to
conductors 323 and 324 to transmit this informa
lease of relays 818, 820, 821, and 822, relay 823,
being operated alone at the end of the fifth pulse.
The, sixth pulse causes the grounding of con
55 ductor 829, operating relay 824 over the front
tion to the decoder. With cross-points ‘H2, ‘H3,
620 and 1 I 5 closed in the dial register, conductors
631, 032, 642, 653, 661 and 662 are grounded to
transmit the units digit of the frame indication
and the code designation to the decoder. It is to
relays 812 and 8“ to grounded conductor 352. ' be noted that the ungrounded conductors are
Since relay 823 locked over the back contact of connected by the relay or cross-point to one of
conductors 625, 626 and 621. These conductors 60
relay 8l8 it is also operated when relay 825 re
leases at the end of the digit and a. circuit is are used by the decoder in making a test- of the
closed from ground at the upper front contact of continuity of all of the registering conductors
each time that the decoder is used.
magnet 101, back contact of relay 825, left nor
Assuming that the wanted number represents
mal contacts of relays M2 and 8“, right front
contact of relay 824, outer left front‘contact of a subscriber’s line'in a panel type o?lce reached
contact of relay 823. Relay 824- locks over its
outer left contact and the normal contacts of
relay 823 to the winding of select magnet 6l6
which prepares the contacts of the No. 6 level of
the register. Magnet 106 and relay 806 are op
. erated under the control of magnet 616 and relay
70 III to close cross-point 622.
In recording the tens digit '7, relays M8 to 822
by direct trunks from the originating o?lce, after
the decoder has completed its decoding opera
tion, class relay 821 is operated. None of the
o?lce register relays of Fig. 10 will be operated, but
conductors 841 and 848 will be grounded by the
decoder, operating the skip of?ce relays 831 and
are operated and released and relays 823 and
938.
824 operated and locked by the first six pulses
as for the hundreds digit. The seventh pulse
compensating resistance relays 903, 804 and 805
75 reoperates relay 8" over the back contacts of
Since short direct trunks are to be used,
are operated.
Since this call is to a' full me-'
chanical oilice, no ?fth digit or stations digit is 75
5
2,100,800
to be expected and relays 984 and 898 are oper
I201, inner upper front contact of relay II08,
conductor II22, fourth right contact of. relay 908,
The decoder from the frame indication received conductor 888, lower back contact'of relay 808
from the sender establishes a connection with‘ to ground, holding relay I201 operated until relay
the district frame and then connects ground to > 808 has been operated. With relay ‘I201 operated, 5
conductor 82I operating relay 90I. Relay 90I an obvious circuit is closed for relay I208 which
ated.
‘
_
extends this ground over its left front contact
to conductor 828 leading through the link switches
to the district junctor where it operates a relay
10 which in turn extends the lead through the dis
trict frame connector to another point in the
decoder where another ground is applied to it.
holds the fundamental circuit open until the
thousands digithas been recorded. Relays I 209
and I295, are also released as long as relay I 208
is‘ held operated.
.
10
After relay 80I releases, relay III8 operates
and when the thousands digit has been recorded,
the fundamental circuit is closed from ‘the funda
mental tip conductor 328, left back contact of
15 of conductor 82f, has been broken.
_
~relay ~90I, conductor 351, lower back contact of '
Having closed this indirect hoiding'circuit for relay I208,,upper fro'nt contact of relay I209,
relay 80I, the decoder connects ground toJcon
‘conductor I240, outer upper from contact of
ductor 910, closing a circuit throughthe winding relay I I08, conductor I'I20, inner upper back con
of relay 88I to battery at the inner upper front' tact of relay 924, conductor 918, outer upper back
contact of relay 990. Relay 99I locks to ground - contact of relay ‘I208, winding of marginal trunk 20
at its inner upper front contact and at its upper test relay I 200, conductor I 24I, lower front con
normal contact opens the ground connected to tact of relay 900, conductor 911, right back con
This second ground holds relay 80I operated after
the direct connection with the decoder, by way
start conductor 9“, thereby Permitting the re
lease of the decoder connector and in ~turn of
the decoder. At its lower front contact relay 98I ,
connects ground to conductor 912 which supplies
locking ground for the class and a part of the
compensating resistance relays, for the of?ce
register relays of Fig. 10, and over the back con
30 tact of relay I I I1 for compensating resistance-re
lays 908 and 901. In addition, ground over con
ductor 912 extends over the back contact of re
lay IIi to the right winding of relay I08 which
operates and locks to conductor 912 independent
35 of relay III. The closure of these lockingcir
cults is thus delayed so that the register relays
may be released and set up in a different pattern
if the decoder reroutes the call.
The selection of an outgoing trunk and the
40 connection of the district junctor to that trunk
take placevunder the control of the decoder, as
described in the above identi?ed Carpenter pat
ent, and when these functions are completed the
decoder removes the ground by which relay 90I
45 was held operated. While relay 80I was operated
it connected ground to conductor 888, front con
tact of, relay 931, conductor 914, winding of re
lay II06, conductor 918, to battery at the outer
upper contact of relay 990.‘ Relay H08 operates
50 in this 'circuit and closes a locking circuit for it
, self through the‘ winding of relay I II 8, outer low
er front contact of relay H09, to ground at the
upperback contact of relay IIII. Relay III8
does not operate, being shunted by the operating
55 circuit of relay II08. ,When the decoder releases
relay 90I, it is an indication that the connection
has been completed as far as the outgoing trunk
and that the sender may assume control of the
further extension of the connection. Relay III8
60 then operates to close the fundamental circuit
for trunk test.
When relay 930 operated. connecting battery to
conductor 918 as above described, relay I2I9 oper
ated from ground at the lower back contact of
tact of relay 2l8, conductor 2I9, resistance 918,,
outer upper back contact of relay 924, conductor
919, inner upper‘front contact of relay III8, 25
conductor II2I,' front contact of relay ‘904,
through resistances 9H and 9I0, front contact
'of relay 908,‘ conductor 980, right back contact
of relay 80I~to the fundamental ring conduc
tor 829.,
,
f
>
'
.30
Whenthis circuit is established and the trunk
and incoming selector are ready, relay I200 op
erates, connecting ground over conductor I242
to the winding of relay 209 and battery. Relay
209‘ in turn closes a circuit from battery. through 85
the winding of relay 208, left front contact of
relay 209, outer left back contact of relay 2I8,
conductor 220 to ground at the inner lower con
tact of‘ relay I209. Relay 208 at its contact
closes a holding circuit for relay 209 to ground 40
at the left back contact of relay 809. Relay 209
also closes a circuit from battery at the outer
upper contact of relay 990, conductor 915, wind
ing of relay I222, windings of relays I220 and
I22I in parallel, conductor I248, inner lower back 45
contact of relay 924, conductor 981, inner lower
front contact of relay H08, conductor H28, in
ner right front contact of relay ‘209, conductor
22I, back contact of relay I209, conductor I244 '
to ground at theouter right front contact of
relay 8I8. Relays I220, I22I'and I222 look over
‘the front contact of relay I222 to ground at the
outer lower contact'of relay I209‘. Relay I22I
in operating closes a circuit from battery on
conductor 918, winding of relay IIOI, lower back 55
contacts of relays IIII, III2, III8, III4 and
III8, back contact of relay I204, inner. upper
back contact of relay I2I0, front contact of relay
I22I to ground over conductor I244. Relay'l IOI
closes a locking circuit for itself through the 60
winding of relay IIII, lower front contact of
relay |IOI, to ground at the upper back contact
of relay III2, but relay I III does not operate,
being shunted by the operating circuit of relay 05
IIOI. Relay Il0l closes a circuit from battery
operated from ground at the outer upper back through the winding of relay I208, upper front
‘ contact of relay I208 and relay I285 operated contact of relay IIOI, outerv upper front con
over the back contact of relay I282 from ground ,tact of relay III6,-to ground‘ at the'upper ‘back
at the inner upper back contact of relay I208.
contact of relay III9. ‘ Relay I208 opens the 70
For a call to a panel type o?ice, the trunk test circuit of relayv I209 which releases, opening the
circuit should not be closed until after the fundamental circuit at its upper front contact,
thousands digit has been registered and there
thereby releasing relay - I200 and opening ‘the
fore, the operation of relay II08‘prepares a cir
operating circuit of relay 209. At its inner lower
cult from battery, through the winding of relay contact‘relay I 209 opens the circuit of relay 208 75
relay I2I_2; relay I2II operated from ground at
the lower back contact of relay I2I0; relay I209
6..
2, 100,800
which releases relay 209. At its outer lower con
tact relay I209 opens the locking circuit of re
incoming selector. Relay I22I closes a circuit
from grounded conductor I244, front contact of
lays I220, I22I and I222 releasing them.
The release of relay I22I permits relay IIII to
relay I22 I, inner upper back contact of relay I2 I0,
operate in the locking circuit of‘ relay II M‘. Re
tacts of relays III5, III4, III3 and III2, outer
lay II II in operating opens the locking circuit of ’
relays H06 and III6 and these relays release.
When relay III6 opens its outer upper front
contact relay I208 releases, permitting relay
10 I209 to reoperate. Relay IIII also closes a cir
cuit from ground at its inner lower front con
lower back contact of relay I204, lower back con
CI
lower front contact of relay IIII, winding of re
lay II02 to battery on conductor 915. Relay
II02 looks through the winding of relay III2,
lower front contact of relay I I02, to ground at the
upper back contact of relay III3. Relay II02
also closes a circuit from ground at the outer
upper front contact of relay I I I I, conductor I I21,
upper front contact of relay II02, winding of re
on its upper front contact and closes an obvious lay‘ I208 and battery. Relay I208 releases relay
15 circuit for relay I205. These relays prepare the
I209 and these relays further open the funda
mental circuit.'. Relay I209 also opens the lock
sender for incoming and final selections.
ing circuits for the counting relays, which there
With relays I 209 and I205 operated, the funda
mental circuit is closed for incoming brush selec~' upon release. The release of relay‘ I22I permits
relay III2 to operate in the locking circuit of
tlon and extends from the fundamental tip con
20. ductor 328 to the upper front contact of- relay relay H02. Relay III2 opens the locking circuit ~
tact through the winding of relay I206 to battery
over conductor 915. Relay I206 locks to ground
the lower winding of polarized relay I203, wind
ing of stepping relay I202, back contact of relay
I220, outer upper front contact of relay I205,
of relays HM and II II and these sequence re
lays release. Relay II02 prepares an additional
circuit for relay I208 which extends from con
ductor II21 over the middle right back contact
ring conductor 329 as before.
lay 806 to ground, if the‘ hundreds digit has not
I209 as previously traced and thence through
25 conductor II2I and thence to the fundamental
'
Relay I202 operates in series with the selec
tor relay, but the current flow is not in the di
rection to operate polarized relay I203. In ad
30 dition the winding of relay I203 is shunted by
a circuit over conductor I240, upper back contact
of relay II06, conductor H24 and resistance I246.
‘ The counting relay circuit for incoming brush
selection, closed by_ relay I202 extends from
ground over the contact of relay I202, front con
tact of relay I2II, back contacts of relays I233
and I223, conductor I248, inner upper front con
tact of relay IIII, over conductor II25 to the
?rst left contacts of the thousands vertical of
40 the dial register 600, over the contact- closed at
cross-point 62I, conductor 612, back contact of
relay I225, winding of relay I226, to battery over
conductor‘ 915. Relay I226 operates, looking
through the winding of relay i225, front contact
45 of relay I226, back contact of relay I234 to
ground at the inner lower contact of relay I209,
but relay I225 does not operate.
~
When the selector at the terminating o?lce
sends back the first revertive pulse by shunting
the sender relay, stepping relay I202 releases
permitting relay I225 to operate and transfer
the counting relay circuit over the front con
tacts of relays I225 and I 235 to the winding of
relay I224 and battery over conductor 915.
When the revertive pulse ends and relay I202
reoperates, relay I224 operates and looks through
the winding of relay I223 to ground at the outer
lower contact of relay I209. The second re
of relay 308, conductor 360, back contact of re- '
yet been recorded to operate relay 806.
.
With relay I III released and relay 806 oper
ated, relay I208 releases, permitting relay I209
to ‘reoperate and the fundamental circuit is 30
closed for incoming group selection. In this case
the counting relay circuit extends from ground
at the front contact of stepping relay I202 to
conductor I248 as before and thence over the
inner upper front contact of relay III2, conduc- '
tor II28, to the left row of contacts of the hun
dreds vertical, over. the contact closed at cross
point 622, conductor 680, third left contact
closed at cross-point 62I, conductor 613, back
contact of relay I221, winding of relay I228 to 40
battery on conductor 915. Relays I228‘and I221
respond to the ?rst revertive impulse while re
lays I226 to I220 respond to the next three im
pulses in the same manner as for incoming brush
selection.
\
'
When relays I220, I22I and I222 operate, the
fundamental‘ circuit is opened as previously de
scribed. Since relay III2 is now operated, re
lay I22I operates relay II03 which in turn looks
through the winding of relay III3 to ground at
the back contact of relay II I4. Relay II03 closes
a circuit from ground at the upper front con
tact of relay III2, lower front contact of relay
II03, to the winding of relay I201 and battery.
Relay I201 in turn operates relay I209 which re- -
leases relay I209, thereby releasing the counting
relays and permitting relay III3. to operate.
With relay III3 operated, relays H02 and III2
release in turn releasing relays I201 and I208 and
60 vertive pulse permits relay I223’to operate. The - reoperating relay I209 to establish the circuits 60
counting relay circuit then extends as traced to
the back contact of relay I233, front contact
of relay I223, conductor 610, middle lower front
contact of relay I205, conductor I241, outer
most
right contact of relay 306, conductor 359,
65
lower back contacts of relays H05 and H04,
conductor H26, winding of relay I222 and to
battery over conductor 915. ' Relay I222 locks
through the windings of relays I220 vand I22I
70 in parallel, front contact of relay I 222 to ground
at the outer lower contact of relay I209. When
relay I202 releases in response to the third re
vertive pulse, relays I220 and I22I operate.
Relay I220 opens the fundamental circuit to
terminate the brush selecting operation of the
for final brush selection.
For this selection, the counting relay circuit
extends to conductor I248 as before, over the
inner upper front contact of relay III3, con
ductor II29, second left contacts of the hun
dreds vertical, contact closed at cross-point 622,
conductor 6", front contact of relay I235, wind
ing of ‘relay I224 to battery on conductor 915.
Relays I220 to I224 function as previously de
scribed in response to two revertive pulses.
Relay I220 opens the fundamental circuit to
stop the ?nal selector. Relay I22I operates re
lay II 04 which looks through the winding of re
lay III4 to ground at the upper back contact
of relay III6. Relay II04 operates relay I208
65
aioaaeo
conductor 982, fourth left contact closed at cross
fundamental circuit and release the counting re
“point 62I, conductor 88I, inner left front contact
of relay 403,. conductor 4I4, outer lower back
lays. With relay I22I released, relay-I I I4 oper
ates, releasing relays H03 and III3. A-further
holding circuit for relay I208 may be traced from
the outer upper front contact of relay II04, inner
lower front contact of relay I205, conductor I249,
second right contact of relay 308, conductor 36I,
lower back contact of relay 801 to ground.
10 Therefore, the circuit for ?nal tens selection can
not be established until the tens digit has been
recorded.
When the fundamental circuit is reclosed for
this selection, relay I202 reoperates closing the
counting relay circuit which extends as previous
ly traced to conductor I248, inner upper front
contact of relay III4, middle upper front con
tact of relay I205, conductor I250, to the left
contacts of the tens vertical, contact closed 'at
cross-point 623, conductor 812, back contact of
relay I225, winding of relay I226 to battery on
conductor 915. The ?rst two revertive pulses
operate relays I228, I225, I224 and I223. Relay
I223 extends the counting relay circuit over its
front contact, conductor 610, middle lower front
contact of relay ‘I205, conductor I241, outermost
right contact of relay 308, conductor 359, lower
back contact of relay I I05, lower front contact
of relay II04, conductor II30, second left row
of contacts of the tens vertical, contact closed at
cross-point 623, conductor 616, winding of re
lay I234 to battery on conductor 915. The third
" pulse, therefore, operates relays I234 and I233,
and locks them to ground at the inner lower con
tact of relay I209. Thereupon the counting relay
circuit is extended over the front contact of re
40
lay I 233 to the back contact of} relay I23I and
the winding of relay I232. In addition, the op
eration of relay I234 opens the locking circuits
of relays I225 and I226 and these relays re
lease. The, next pulse operates relays I 232 and
I 23I , which lock to ground at the inner upper
contact of relay I208.
Relay I232 opensthe
circuit of relay I 235 which releases. The next
three pulses operate relays I 230 to I225, inclu
sive, and since relay I235 is released, relay I225
extends the counting relay circuit over its front
contact and the upper back contact of relay I235
to the winding of relay I222. The eighth rever
tive pulse operates relays I 220 and I 22I in the
locking circuit of relay I222, terminating the
tens selection.
Relay I22I operates relay H05, which locks
‘ through the winding of relay III 5, inner lower
front contact of relay II05, upper back contact
of relay III6, to ground at the upper back con
60
7
which releases relay I209 to further open the
contact of relay 92I, outer upper front contact
of relay 93I to grounded conductor I244. Relays
509 and 5I9 lock over the outer lower front con
tact of relay 509 to grounded conductor I244 and
close a circuit from battery through the winding
of relay 809, conductor 83 I, inner lower front con
tact-of relay 509 to ground. Therefore, relay 809 10
operates to permit the closure of the fundamental
circuit for ?nal units selection'as soon as the units
digit is registered. Relay 809 also removes the
ground from.conductor 352 to prevent false regis—
tration in case‘ of belated dialing or switchhook
’ manipulation.
The counting relay circuit for ?nal units selec-'
tion extends‘to conductor I248, inner upper front
contact of relay III5, outer lower front contact .
of relay I205; conductor I252, left contacts of 20
the units vertical, contact closed at cross-point
624, conductor 613,, back contact of relay I221,
winding of relay I228 to battery. Relays I228
to I223 are operated under the control of the ?rst
three revertive pulses. Relay I223 extends the
counting relaycircuit as traced for ?nal- tens
selection to conductor 359, over the outer lower
front contact of relay II05, conductor II3I, sec
ond left contact of the units vertical closed at
cross-point 624, to conductor 816. The follow-i 30
ing six pulses operate relays I234 to I225, and re
lays I222, .I22I, and I220 as previously described.
Relay I22 I, when operated, closes a circuit from
grounded conductor I244, front contact of relay
I22I, inner upper back contact of relay I2I0, ‘
lower back contact of relay I204, outer lower front
contact of relay I I I5, conductor 913, frontlcon
tact of relay 938, conductor 914, winding of relay
II06 to battery on conductor 915.
Relay “06
operates and closes a circuit for relay I201 over
its inner upper front contact, lower back contact
of relay II03 to ground at the outer upper front
contact of relay II I5. Relay I201 operates relay
40
I208, releasing relay I209 and the counting relays,
thereby permitting the operation of relay- III6
in the locking circuit of relay II06, releasing~~ re
lays II05, II_I5, I201 and I208 and reoperating
relay I209.
When relay I208 releases and relay I209 re
operates to reclose the fundamental circuit, the
incoming selector at the terminating o?ice trans
mits a single long pulse of reversed ‘battery over
the fundamental circuit to the sender. Relays
I202 and I203 are both operated in responseto '
the reversed battery. Relayl203 looks over its
upper front contact to grounded conductor I244.
tact of relay III3. Relay II05 operates relay It also, extends this locking ground over the lower
I201 which in ‘turn operates relay I208, releasing front contacts of relays III6 and I206 to the
relay I209 and the counting relays. The release . winding of ‘relay I204. and. battery. - With relay
of relay I22I permits relay II l5 to operate and I204 operated, the operation of relay I202 closes
release relays H04 and III4; Relay I201 is held
operated after relay III4 releases over the inner
upper front contact of relay I205, conductor I25I,
outer left back contact of relay 308, conductor
362, outer lower back contact of relay 924, con
ductor 98I, lower back contact of relay 809 to
ground if registrations have not been completed.
It will be remembered that magnet 108 in op
erating operated relay 403, and that the decoder
operated delay relays 934 and 935, indicating that
a circuit from ground over the front contact of
relay I202, front contact of relay I2II, outer"
upper front contact of relay I204, conductor
II26, winding of relay I222 to battery on con-.
ductor 915. Relay I 222 locks through the wind
ings of relays I220 and I22I, front contact of
relay‘ I222 to ground‘ at the outer lower contact
of relay I209. Slightly after the closure of‘ the“ 5»
circuit ofrelay I222, relay I204 closes a circuit '
from groundatthe upper back contact of relay 70
I2I2, inner upper contact of relay I204,,‘conduc-v
tor I253, outer'upper, contact of relay-'90
n
403 operated, a circuit was closed from battery ductor ms, to the windings of relays I220
neither ?ve digit numbers nor stations letters
were to be expected. Therefore, as soon as relay
through the windings of relays 509 and 5I9 in
series, over the upper front contact of relay 934,
and I222. The purpose of this circuit is to insure
the operation of these relays in case the reverse
8
2,1os,sso
battery impulse is too short to permit relay I222
to operate in the manner above described. It is
also carried over the contact of- relay 905 so as
to be ineffective for calls over long trunks where
relay I202 may operate late.
003 in series to battery. With these relays oper
ated an additional holding circuit exists for re
lay I20'I extending from conductor 399‘ over the
permitting relays I220 and I22I to operate. Re
left front contact of relay 929, which is held
operated between digits,‘ conductor 932, inner
lower. front contact of relay 92 I, outer lower
contact of relay 923, conductor‘ 4“, outer lower
contact of relay 903, outer upper front contact of 10
relay 93I to grounded conductor I244. The trunk
lay I220 opens the fundamental circuit in the
test circuit, therefore, cannot be established until
At an interval following the reverse battery
pulse from the incoming selector, direct battery
is connected to the trunk and the selector awaits
‘mink closure by the district junctor. The re
moval of the reverse battery releases relay i202
sender to prevent a false trunk closure signal.
after the ?rst pulse of the tens digit has been re
Relay I22l closes a circuit from ground on con
ceived to operate relay 929 and release relay 929.
ductor I244, front contact of relay I22I, inner
upper back contact of relay I2I0, lower front
contact of relay I204, conductor I294, winding
of relay 909 to battery. Relay 309 locks over,
its left contact to grounded conductor 393, mark
ing the completion of the sender's function on the
call.
Relay 309 at its inner right contact closes a
shunt around resistance 305, thereby operating
a marginal relay in the district junctor, which
establishes the talking circuit and holding circuits
for the line switches, district and of?ce switches.
Relay 309 also disconnects ground at its inner
.right back contact from the armature of relay
Call through tandem o?lce
3I0, thereby releasing relays 9I4, 9I5, 3I4 and
Relay 3I4 disconnects ground from con
ductor II4. With relay 309 operated and relay
3I3 released, relay 3I9 also releases, opening the
link in the senders-busy chain, disconnecting
30 3I3.
ground from conductors 393 and I244, thus re
moving the off-normal grounds and releasing
the locked relays of the sender. It likewise re
connects the idle battery to the fourth lower con
tact of,relay 3“. Furthermore, it disconnects
ground from conductor 390 and the lowermost
40 contact of relay 3| I. The disconnection of ground
from conductor 390 releases the sender link
switches and so disconnects the sender from the
district junctor.
45
upper front contact of relay 93 I, outer lower front
contact of relay 92I, windings of relays 0i 3 and
In tracing the operation of the sender in con
trolling the completion of a call through a tandem
o?ice, it will be assumed that the call originates
at a substation equipped with a coin box, that
the wanted o?lce is reached through two distant
omce selectors, that the wanted oillce employs
party line designations and ?ve-digit numbers
between 10,000 and 10,499 and that Walker 5-1078
is the number of the wanted subscriber.
The seizure of the sender results in the oper
ation of relays 3H and 3I2, whereupon the frame
relay and the subscriber class relay are oper
ated. Frame relay 399 and class relay 309 may
be assumed to be operated. When the tip and‘
ring conductors are completed through the line
and link switches relay 3I0 operates, in turn
operating relays 9I4, 3I4, 3I3 and 9I9. Relay
3I0 is operated over conductor 339 and locks un
der the control of relay 3I3. Relay 3II releases
the link control circuit, 'holds' the link and line
switches and releases relay 3I2, relay 3“ being
released by the link. The units digit of the dis
trict frame is recorded as previously described,
and assuming it to be thesame as before, re 40
sults in the closure of cross-point ‘H2 and the
operation and locking of magnet "I and relay
"I and the operation of relay 929.
The recording of the wanted number takes I
45
Call to cross-bar omce _
place in the manner previously described, re
This type of call diil’ers from the call to a
panel type o?ice in only a few minor details since
the incoming sender in a cross-bar oiilce trans
mits simulated revertive pulses, which cause the
sulting in the closure of cross-points 990, ‘N9,
09l, ‘H1, ‘H9, 923, 924 and 992 accompanied by
the operation and locking of magnets "I to ‘I09
and ‘H0 and relays "I to 909, inclusive. Relays
subscriber's sender to function in the same man
ner as do the selectors of the panel office. For a
409 and 403 are operated by magnets ‘H0 and
109, respectively. The seizure of a decoder and
the transfer of the recorded information also
take place as previously described.
Under the conditions assumed. the decoder
call to a cross-bar o?ice, class relays 92l_ and 923
are operated. Relay 909 is not operated and
therefore the trunk test employs relay I20I in
55 stead of relay I200.
15
grounds certain conductors 'so that neither of t 55
,
The call also diifers in that trunk test may not
be made until the hundreds digit has been re
corded. It will be remembered that relays H09
and I I I9 are operated for trunk test. With class
relays MI and 923 operated the operation of re
lay I I09 closes a circuit from battery through the'
winding of relay I201,’ inner upper front contact
of relay H09, conductor H22, fourth right back
contact of relay 309, conductor 359. middle upper
front contact of relay 92I, inner lower contact
of relay 923, conductor 993, upper back“ contact
of relay H02, conductor “21, third right back
contact of relay 309, conductor 390, lower back
contact of relay 909 to ground. Relay I201 holds
70 relay I299 operated and the fundamental circuit
open until after the hundreds digit has been re
the stations delay relays 934 and 939 are oper
ated; compensating resistance relays 902, 903
and 901 may be operated, but relay 900 is not
operated, being used only with calls to panel
omces. Class relay 922 is used for this type of
call. Relay 939 is operated but relays 931 and
0o.
939 are not operated. For controlling selections
by the distant omce selectors, relays IO0I, IOI3,
I022, I03I, I032 and I094 may be operated. These
relays look under the control of relay 93I with 66
the exception of relay 901' which is further con
trolled by relay III'I. With class relay 922 oper
ated, relay 924 operates over the lower front
contact of relay 922 and grounded conductor 912.
Since the stations delay relays indicate that 70
a fifth digit may be expected, but none is actu
ally dialed, the operation of relay 909 to indicate
that dialing has been completed is delayed. When
relay "I is operated by the release signal from
_the
decoder, a circuit is closed from grounded 75
decoder,
from
grounded
conductor
I244,_outer
70
corded.
‘
_
Since relay 92I is operated, a circuit is closed,
_'when relay 93I operates. on the release of the
a
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