close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3087033

код для вставки
April 23, 1963
3,087,023
c. E. LOMAX
TWO HUNDRED LINE CONNECTOR SWITCH
Filed June 24, 1959
3 Sheets-Sheet 1
L 100
j
i
3H
J.
Q
H
A
,
5214
9
PBX
LINES
Fm. 1B
60
INVENTOR.
Clarence E. Lomox
“'? a”
AHy.
April 23, 1963
‘
c. E. LOMAX
3,087,023
TWO HUNDRED LINE CONNECTOR swrrca
Filed June 24, 1959
'
s: Sheets-Sheet 2
FIG. 2
C201
CONNECTOR 200
0201
VERT
F22?’
o
3
O
3
O
255
.
0308,
, 222>
VERT. BANKS
22o
INVENTOR.
C lclrence E. Lomex
United States Patent 0 'ice
1
l
3,087,023
Patented Apr. 23, 1963
2
?xdigit being the hundreds digit of the directory number,
3 087 023
therefore requires the directory numbers of the two
TWO HUNDRED Ln’sE eoNNEcroR swrrcn
party line to differ only by this hundreds digit. This
otters simple distribution of directory numbers on the part
Clarence E. Lomax, Hastings, Nehru, assignor to Auto
matic Electric Laboratories, Inc, a corporation of Dela
of the telephone company and easy location of a troubled
line..
are
Filed June 24, 1959, Ser. No. 822,666
5 Claims. ((11. 179-48)
In PBX calls, no pre?x digit is necessary, whereby the
?rst wiper set is always utilized to test the PBX line while
the second wiper set is disabled although it is also con
This invention relates in general to telephone systems,
and more particularly to a connector switch having a 10 nected to the same PBX line but to a different PBX trunk._
If the ?rst wiper set engages a busy trunk, a wiper switch
ingrelay is operated to disable the ?rst Wiper set and en
'ables the second wiper set to test its associated PBX
maximum capacity for two hundred lines of party lines
and private branch exchange lines.
In the past, a regular PBX connector consumed one
trunk withoutrotation of the wipers. Only when both
hundred call numbers, and yet served far less than one
hundred subscribers, which is a loss of call numbers. For 15 PBX trunks extending to a particular PBX line are busy
will a busy tone be transmittedto a calling party.
instance, many small business concerns have only one line .
Referring brie?y to FIGS. 1A and 1B showing two
and yet they are connected into a PBX connector group
separate double levels of bank contacts, a preferred gen—
because it is expected that they may later need a second
eral layout of the different levels will be described. The
line, which results in leaving an unused contact in the
PBX connector bank and represents a lost call number. 20 ?rst ?ve double levels will be utilized for a single or two
party line, as shown by the two-party line L100 in FIG.
It is therefore an object of this invention to provide
1A. The last ?ve double levels will be utilized for PBX
a connector adaptable to changing conditions so that the
trunks, as shown by the sixth level in FIG. 1B. As
number of levels for one service can be increased and
shown for the two-party line L100 of FIG. 1A, it will be
the levels for the other service decreased.
seen that a ?rst set of wiper level bank contacts corre
It is a further object of this invention to provide a
sponding to the ?rst party thereon is multiplied .to a sec-_
connector of the Strowger type which will give automatic
ond set of wiper level bank contacts corresponding to the
trunk selection to a plurality of PBX trunks without the
second party, also thereon. These wiper level contact
wipers moving beyond the terminals to which they Were
banks for two-party lines are on the same vertical levels,
dialled.
but are accessed by two different sets of wipers, 391-393 _
Another object of this invention resides in a connector
with two sets of wipers which move together, one set to
select terminals in a ?rst group and the other set to select
or 394-396. As shown on line L100 a ringer R1 for sub
termnials in a second group, a means whereby the opera- .
and ringer R2 for subscriber X212 is connected to the .
tion of the dial can determine which set of wipers to use
and. also select the desired terminal, and a means where
by the connecting together of the two corresponding ter
minals will result in serving a two-party line and give
selective ringing.
scriber X112 is connected to the negative side of the line
positive side of the line, and thus either the wiper 391 or
» subscriber
394 applyngis the
being
ringing
rung.frequency
Although
willsubscribers
determine which
X112 ‘1
and X2712 are shown as a two-party line, they could easily
be changed to single party lines by removing the multiple ‘
connections across the band contacts, such as ‘shown in ,
Another object of this invention resides in a connector
which serves private branch exchanges, which has a plu 40 FIG. 1B regarding the PBX lines. ‘The. PBX line '1
terminating in PBX trunk 50 would extend to the same
rality of groups of trunks on one or more levels, which
PBX as line 2 terminating in PBX trunk 60. For this
has one or more trunks in each group of trunks, and
reason, which will become apparent fromthe detailed
which, when there is more than one trunk in the group
explanation-to follow, if line 1 is found busy by the ?rst
called, will automatically select an idle trunk without the
set of wipers, connector 200 will substitute switch con—',
switch rotating.
’
nection to the second set of wipers to extend a testing
A feature of the present invention resides in the use of 7
connection to line 2.
vertical banks and auxiliary wipers in the connector which
Referring brie?y to FIGS. 2 and 3, the connector 200 I
comprises fourteen relays, three magnets, two sets of.
control dropback, wiper selection, and “Wanted Tone,”
all dependent on the vertical bank level to which the auxil
iary wiper is stepped and the sequential order in which 50 wipers, as fell as a pair of auxiliary wipers. The vertical _
the corresponding digit was received.
Another feature of the invention resides in applying
banks 220 are. divided into a left and right set of banks
having separate wipers 221 and 222 respectively. The
a “Wanted Tone” momentarily to a busy line for noti?ca
tion to the party thereat that someone is trying to call.
Other objects and vfeatures will become apparent from
a perusal of the following speci?cation taken in combina~
tion with the drawings, of which:
FIGS. 1A and 1B are schematic circuit drawings repre
senting two different levels of bank contacts on a con
nector, and more speci?cally FIG. 1A shows a two
party line, and FIG. 1B shows PBX lines and trunks; and
vertical banks are so wired that if a ?rst digit “1” is re
ceived over the calling loop, the wipers will restore, and
if a ?rstdigit “2” is received the .Wipers will restore and
switch from wiper set 391-393 to wiper set 394-396. If
the digit “1” or “2” is dialled as a second digit following
their usage as a ?rst digit, the wipers will not restore and
60
the ?rst and second levels can thus be ‘used for extending
calls. Therefore, the ?rst digit will determine which set
of wipers will be used for party line calls providing the
FIGS. 2 and 3, with FIG. 3 to the right, shows a two
second digit is a digit from “1” to “5” snce only the ?rst
?ve levels are reserved for party lines.
type.
Since the upper ?ve levels ‘are reserved ?or PBX trunks,
With the utilization of a double wiper, set in a con 65 no pre?x digit (“1” or "2”) will be necessary. The level
nector, a two-party line can be conjointly engaged by‘both
dialled to on the ?rst digit received will be the level
hundred line capacity connector switch of the Strowger
wiper sets simultaneously. Likewise, two trunks to .the
used, with directive dial rotary action taking place in the
same PBX can also be conjointly engaged by both wiper .
usual manner and always utilizing the wipers such as
391-393. If the PBX trunk tests busy, busy test relay
330 will operate when slow-to-release relay 340 restores
sets. In the case of the two-party lines, a pre?x digit to
be absorbed acts as the means through a vertical bank to
determine which wiper set will be utilized for extending
which. causes wiper switch relay 380 to operate by way of .
the right vertical bank. Relay 380 thus substitutes the,
3,087,023
4
upper wipers 391-393 with the lower wipers 394-396’
opening its original operating circuit at contacts 282.
without additional stepping of the wipers to thus test the
busy condition of a second trunk extending to the same
PBX. If this second trunk also tests busy, the busy
test relay 330 remains operated and a “Wanted Tone”
will be momentarily transmitted over this secondv trunk
to'notify the busy party thereat of an awaiting call.
Contacts 281 close ground via contact 253, 272, conduc
tor C303, contacts 266 to energize release magnet 370.
The release magnet 370‘ in energizing restores the wipers
An alternate wiring-scheme comprising X and Y wiring
is utilized for extending a “Wanted 'I‘one” to busy lines
for noti?cation of an awaiting call. By utilizing the X
wiring which is strapped to the upper ?ve left bank con
tacts on vertical banks 220', only PBX subscribers will
receive this “Wanted Tone” in the event both of their
respective‘ lines are found busy. By utilizing the Y wiring,
to normal and opens the VON contacts 256 to restore
relay 250. Relay 250 in restoring opens the shunt across
the lower Winding of relay 270 by opening contacts 253.
Relay 270 thereupon, operates in series through its lower
winding with the release magnet 370‘. Relay 270‘ in op
erating closes its “X” contacts 271 ?rst, to lock relay 270
operated through its upper Winding via grounded con
ductor C204. Relay 270 thereafter opens contacts 273
and 274 without effect at this time, except that in opening
contacts ‘274, the wiper ‘switching relay 380 will be unablev
both PBX lines andlsingle or two-party lines will receive 15 to operate on the next digit to switch wipers. Contacts
272 open the circuit to release magnet 370 to cause de
this “Wanted Tone” on busy lines. These operations will
energization thereof.
become more clearly understood from the detailed opera
Upon receipt of the second digit “1,” line relay 230
tion to follow.
will again release and operate one time to pulse vertical
Operation
Assuming that a call is being made tosubstation X112 20 magnet 255 to step the wipers 391-396 and 221-222 to
their respective ?rst bank contacts, as above described.
(FIG. 1A), connector 200 is found idle by a preceding
However,
in this case, when the VON contacts 256‘ close
selector switch (not shown) encountering battery, which
to operate relay 250*, the closing of contacts 253' to shunt
may be traced as extending from the upper winding of
relay 270 is ineffective since relay 270' is locked operated
relay 260, contacts 251 and back over control conductor
through its upper winding. Also, the circuit to release
C203 to initiate a seizure of this connector in a well
magnet
370is opened at contacts 272. After a short dura
known manner. Thereupon, the loop circuit is extended
tion, the slow-to-release relay 260‘ restores after termina
over negative conductor C201, contacts 211 and‘ upper
tion of. the second dialled digit, and at contacts 262 pre
Winding of relay 230' to battery on the one hand, and
pares
a circuit to the rotary magnet 325.
over positive conductor C202, contacts 213, and lower
Upon receipt of the third or last digit “2,”'line relay
winding of relay 230I to ground on the other hand. Relay 30
230 will intermittently release and operate two times.
230 operates and closes an obvious circuit at contacts 231
to' relay 2.40. Relay 240 operates, closing ground at con
tacts 241 over conductor C301 through the upper winding
of relay 360, contacts 385‘, and to control wiper 393. Con
tacts 2'42 close ground to operate relay 260 and extend it
back over control conductor C203 to hold the preceding
equipment in a welléknown manner. At contacts 243‘ and
the operation of relay 260 at contacts 261, a circuit is
Upon each intermittent release of relay 230, a ground
pulse is. closed via contacts 232, 243‘, 262,’ conductor
C3612, contacts 335, 365, winding of rotary magnet 325
to battery, to thus pulse rotary magnet 325 two times.
Also, this ground pulse will 'go through the winding of
relay 340 to cause operation thereof, and being of the
sloW-to-release type will remain operated throughout the
impulse series. At contacts 341, an obvious alternate
magnet 255. Contacts 245 close ground to certain con 40 circuit is closed to the rotary magnet 325‘, so that in case
a busy contact is engaged during rotation of the wipers,
tacts on the left and right bank contacts of vertical bank
prepared‘ to the lower winding of relay 260 and vertical
220;,and prepares circuits to relays 270, 280‘, 360, and 280.
Referring brie?y to FIG. 1A, as previously mentioned,
substation X112 has its ringer on the negative side of
the line and must therefore be rung over wiper 3911.
Thus, the digits “112” must be dialled as the last three
digits by the calling party in order, to ring this substation.
Upon receipt of'the ?rst digit “1,” pulsing relay 230 will
the momentary operation of busy test relay 3303 Will not
interfere with direct rotary dialling by opening contacts
335. At contacts 342‘an obvious circuit is closed to relay
350. Relay 350 operates, and at contacts 351 opens a
prepared circuit'for transmitting a “Wanted Tone” over
the positive wiper 3921. Contacts 352 open a prepared
“Busy Tone” circuit to the calling party. At contacts
353 a prepared circuit to relay 360 is opened, and at con
tacts 354 the busy test relay 330 is connected‘ to the con
trol wiper 393 via contacts 385. At contacts 356 a cir
intermittently restore and operate onetime. Contacts
231 will open the circuit to relay 240 however, relay 240‘
isvof the sloW-to-releas'e type and remains operated during
cuit is prepared to relay 320‘, which will be explained
the duration of dialling. Contacts 232 intermittentlyl
shortly hereafter. After the termination of the two im
closes ground, via contacts 243', 261, to the lower winding
pulses, rotary magnet 325 will have‘ stepped the wipers
of relay 260 to battery, and through the winding of the
vertical magnet 255 to battery. The vertical‘ magnet 255‘ 55 391—396 to their respective second rotary position on
the ?rst level of bank contacts.
energizes to step the wipers 391-396 to the ?rst level of
As above mentioned, the operation of relay 350 closes
‘bank contacts, and also step the auxiliary. Wipers 221 and
contacts 356 to prepare a circuit to relay 320‘. We will
222 to their respective bank contacts on vertical banks
assume ?rst the utilization of the X Wiring. Since in
220. Upon the wipers taking their ?rst step, the VON
springs‘ operate, closing at VON contacts 256 an obvious 60 this case the X wiring is connected from the sixth to
tenth bank contacts on the left vertical bank of 220,
circuit to relay 250. Relay 250* operates, and at contacts
and the wiper 221 is on the ?rst bank contacts, relay
251‘ opens the operating circuit to relay 260 however,
320
will not be affected. As mentioned, these upper
‘relay 260 being of the slow-to-re'lease type remains op
two banks correspond to the PBX lines and therefore
erated during pulsing through its lower winding. At
contacts 252, a circuit is prepared to the release magnet 65 the Wanted Tone as normally extended by relay 320‘ is
370.
Contacts 2573' close a shunt across the lower wind
ing, of relay 270. Upon the termination of the digital
impulse series, the slow-to-release relay 260‘ restores, and
not utilized on calls to party lines. However, if the
Y wiring is used, every time contacts 356 close, a direct
ground circuit is closed to relay 320. As mentioned, the
Y wiring is used when it‘ is desired to provide Wanted
extending from battery, winding of relay 280’, contacts 70 Tone to all types of lines. The operation of relay 320
closes contacts ‘321 to prepare for the extension of
282, 273-, conductor C305, ?rst left contact and wiper
at' contacts 2635 closes a circuit to relay 280; the circuit
221 on the vertical bank 220,v conductor C2053, contacts
Wanted Tone to the called party in the event this line
is found busy.
Returning to the rotary stepping of wipers 391-396
280 operates, closing its make contacts 283‘ to close a lock
irig circuit for itself via grounded conductor C204, before 75 to the second rotary ‘bank contacts, and‘ if it' is assumed
263,, conductor'C204, to‘ ground at contacts 245. Relay
A
3,087,023
6 .
loop of called party X112, wiper 392, contacts 383, 363,
that the called substation X112 is busy, busying ground is
encountered by the control wiper 393 in a well-known
manner. The busy test relay 330 will operate from
315, conductor C202 and the lower winding of relay
210 to ground. Relay 210 operates, closing contacts
this ground via contacts 385v and 354. The slow-to-re
lease relay 340 will release a short period after the ter
relay 230 while maintaining this relay operated during
mination of the rotary impulse series, opening at con
tacts 342 the circuit to the slow-to-release relay 350.
The closing of contacts 343 and the operation of relay
330 at contacts 336 closes ground to the upper right
212 ‘and 214 to reverse polarity on the calling loop from
the opening of contacts 211 and 213. This reversal in
polarity will operate the meters on the line (not shown)
in a well-known manner.
At contacts 215 a second
ground is applied to conductor C204 to aid in maintain
?ve bank. contacts on vertical bank 220 without effect, 10 ing relay 380 operated. Relay 210 will thus provide
transmission battery for the called party, and relay 230
however, on this call. After a short duration, the slow
will provide transmission battery for the calling party.
to-release relay 350 restores, closing make contacts 355
Assume next a call to the second substation X212 on
before opening contacts 354 in the operating circuit for
line L100. In this case the digits “212” must be dialled
the relay 330 to close a locking circuit to relay 330'.
This last-mentioned locking circuit extends from battery, 15 into connector 200. Upon receipt of the ?rst digit “2,”
line relay 230 will pulse the vertical magnet 255 in a
the winding of relay 330, contacts 355, 334 and 241 to
manner previously described and step the wipers to their
ground.‘ Assuming that the Y wire is used whereby
respective second level of bank contacts. The restoring
relay 320 operates, the “Wanted Tone” is extended to
the called line via contacts 321, 331, 351, 383, wiper 392
of relay ‘260 at the termination of the ?rst impulse series
will operate relay 380 instead of relay 280 in this case.
and over the positive side of the line L100 to notify the
This last circuit extending from battery, the winding of
called, party X112 that another party is trying to call
relay 380, contacts 388, conductor C306, contacts 274,
him. Also, a “Busy Tone’? is sent back to the calling
part vvia contacts 352, 332 and back over positive con
ductor C202“ At contacts 335- the circuit to relay 340 is
conductor C206, the second left bank contact on vertical .
erates,rclosing its “X”. contacts 367 ?rst, to close a lock
that relay 380‘ has switched connections to use the second
bank 220, wiper 221, conductor C205 contacts 263 and
further opened. The above-mentioned “Wanted Tone” 25 245 to ground. Relay 380 operates, closing contacts 382,
would remain on the line called only the length of time
384 and 386 to switch the circuit connections fromthe
?rst set of wipers 391-393 to the second set of wipers
it" takes for the slow-to-release relay 320 to restore as
394—396. At contacts 389 relay 380- locks operated to
a result‘of its operating circuit being opened at con
grounded conductor C204. At contacts 387 a circuit
tacts 356 when relay 350 restored. The called line, hav
is closed to relay 280; the circuit extending from battery,
ing received the “Wanted Tone,” may then proceed to
the winding of relay 280, contacts 282, 273, conductor
hang up at his discretion, and attempt to make. his line
C305, contacts 387, conductor C308, second right bank
idle to await the return of the call. The calling party,
contact on vertical bank 220, wiper 222, conductor C204,
upon receipt of the “Busy Tone,” would proceed to hang
to ground at contacts 245. Relay 280 operates, locks via
up to release the connection, and remake the call at a
contacts 283 to grounded conductor C204, and closes the
later time at his discretion.
previously traced circuit to the release magnet 370 at
Assuming however that the called party X112 is idle,
contacts ‘281. The release magnet 370 thereafter op
battery will be encountered by control Wiper 393, and
erates to return the wipers to normal. Relay 250 will
the busy test relay will not operate. After a short dura
restore to in turn operate and lock relay 270 operated.
tion, the release of the slow-to-release relays 340 and
350 completes a circuit to the switch-through relay 360 40 as previously described.
The receipt of the last two digits “12” operates the.
from the battery encounter-ed by wiper 393, contacts 385,
connector to step and rotate the wipers in a manner pre
353, upper winding of relay 360, contacts 333, conduc
viously described to seize line L100 with the exception
tor C301, and contacts ,241 to ground. Relay 360 op
ing circuit for itself through its lower winding from 45 set of wipers. In this case the ringing frequency will be
transmitted over wiper 394, and as shown in FIG. 1A, the
ground at contacts 245 and ‘via conductor C204. There
bank contacts accessible by wiper 394 are strapped to
after, relay 360 operates its remaining contacts closing
the positive side of the line and ringer R2 will thus respond
at contacts 362 the ringing frequency to the called party
to notify substation X212 of an incoming call. Also,
via GEN, the lower winding of relay 310, contacts 311,
should this party be busy at the time the wipers engaged
362, 381‘,- wiper 391 and to the ringer R1 of subscriber
X112 connected ‘to the negative side of the line. Con
the line, the momentary “Wanted Tone” would be trans
tacts ‘361' extends ringback tone via contacts 313 and
negative conductor C201 to the calling party. At con
tacts 363 a circuit is prepared to ringing relay 310. At
contacts 364 a lockingcircuit is prepared to ringing relay 55
310.. At contacts 365 and 366. prepared circuits are
further opened to relay 340 and release‘magnet 370 re
spectively.
i
mitted over wiper 395 to the negative side of the line..
Thus on calls to either party on the line the “Wanted
Tone” and ringing frequency are always transmitted on
opposite sides of the line.
Although only a two-party line L100 has been shown,
it should be understood that substations X112 and X212
could easily be converted to single party lines. Also,
each level of bank contacts could contain mixed lines of
When the called party answers, the ringer resistance
is removed from across the line and the called party’s 60 single and two-party lines as the subscribers may so de
loop is closed ‘to operate the ringing relay 310 via bat
sire, or be easily convertible to one or the other by merely
tery on GEN lead, the lower winding of relay 310, con
changing the strapping on the bank contacts. Further
tacts 311, 362, 381, wiper 391, through the called party’s
more, it is to be pointed out that the vertical banks 220
are’ effective only on the ?rst digit dialled into connector
loop, wiper 392, contacts 383, 363, 314 to ground. Re
lay.310i closes its “X” contacts 316 ?rst to lock itself op 65 200, and therefore calls to levels 2-5 on the second digit
erated through its upper winding via ground at contacts
would cause the same respondence as above described for
364, Thereafter, the remaining contacts of relay 310
the ?rst level.
Release
operate, ‘opening at contacts 311 and 314 the above
traced ringing circuit and ‘the operating circuit for relay
I On the termination of a call, when the called party
310. At contacts 313 ringback tone is removedr'from 70 hangs up, the loop circuit to relay 210 is opened to cause
restoration thereof. The restoration of relay 210' at con
the calling line. At contacts 312 and 315 the talking
tacts 211 and 213 again reverses polarity to the calling
circuit is extended to thecalled party, while a circuit
loop via relay 230 to‘ again operate the meters (not shown)
is alsoclosed to relay 210, with this circuit extending
to meter the call. At contacts 215 one of the grounds is
from battery, upper winding of relay 210, conductor
C201, contacts 312, 362, 381, wiper 391, through the 75 removed from conductor C204.
3,087,023
7.
8
When the calling party hangs up‘, the loop circuit to
relay 230' is openedcausing restoration thereof; At con
tacts'23‘1 the circuit to the slow-to-release relay 240 is
contacts 388, conductor C306, contacts 274, conductor
C206, the tenth to sixthright bank contacts of vertical
bank 220, wiper 222, conductor C304, contacts 336, 343
to ground. Relay. 380'thus operates before the slow-to~
release relay. 350 restores, and at contacts 389* relay 380
locks operated to grounded conductor C204.‘ Relay 380
opened. At contacts 232' a circuit is prepared to the re
lease magnet 370'. After a short duration the slow-to‘
release relay 240' restores, opening at contacts 245 the
circuits to relays 270, 280‘, 360‘, and 380 to cause restora
tion thereof, to close a circuit to the release magnet 370,‘
at contacts 382, 384 and 386v switches the connection of
connector 200 to the second set of wipers to test the line
2 corresponding to PBX trunk 60. Since relay 380 oper
via battery, the release magnet 370, contacts 366, con
ductor C303, contacts 252, 244- and 232. to ground.. The 10 ates before relay 350- restores, the “Wanted Tone” is
release magnet 370‘ will thus energize to restore the
never transmitted over linel, nor is a “Busy Tone” trans
mitted back to the calling party as aresult of this line
wipers to normal to in turn open VON contacts 256 to
testing busy. Control wiper 396 now engages the con
restore relay 2501. Relay 250‘ in restoring opens con-.
tacts corresponding to line 2 (FIG. 1B), and the idle or
tacts-252-to deenergize the release magnet 3701 Also, the
restoration of relay 3:60v at contacts 364 will open the lock 15 busy condition existing thereon will determine whether
or not relay 330‘ will remain operated; Should line 2
circuit to relay 310‘ to cause its release.
also be busy, wiper 396will encounter busying ground
PBX Call
and relay 330 will be maintained‘ operated. However,
should line 2 be idle, relay 330' will restore.
As previously mentioned it was assumed that the sixth
Assuming line 2 is also busy, relay 330 is maintained
to tenth levels ofv connector 200 were reserved-for PBX 20,
operated,
whereby slow-to-release relay 350 eventually
lines. Therefore, the ?rst digit dialled must be from “6”
restores, and “Wanted Tone” is extended over line 2 via
to “0.”
Referring brie?y to FIG. 1B showing the PBX trunks
50 and 60 accessible from the sixth level and ?rst bank
contacts, a call to these trunks Will be described. The
?rst two digits dialled into connector 200 must thus be
contacts 321, 331, 351, 384, wiper 395, the positive side
of the line and via PBX trunk 60 to a PBX'subscriber. At
contacts 352 “Busy Tone” is closed to‘the calling party,
and at contacts 355 relay 3'30 locks operated, all as pre
viously described.
Thus, the called P-BlX subscriber,
the digits “61.”
Upon receipt of the ?rst digit. “6,” line relay 230 will‘
pulse the vertical magnet 255- six times to step the wipers
having received the “Wanted Tone” over line 2, may at
tempt to make one of 'his lines idle in anticipation that
sixth left bank contacts of vertical banks 220. The re
lease of relay 260' at contacts 262 now prepares a circuit
from battery engaged by control wiper 396, contacts ‘386,
353, upper winding of relay 360, contacts 333, conductor
to rotary magnet 325.
C301, and contacts 241 to ground. Relay 360* operates,
closing its “X” contacts 367 ?rst to lock relay ‘360 operated
through its lower winding via grounded conductor C204.
to the sixth level of bank contacts in a manner pre 30 the calling party will call again. The calling- party upon
receipt of the “Busy Tone” will‘ hang up. and call again
viously described. At thetermination of the received
at alater time.
?rst digital impulse series, relays 230, 240, and \250‘ are
Assuming however that line 2 was found to be idle,
operated and after a short duration, relay 260‘ has released
the control wiper 396 therefore encounters battery, and
in a manner previously described. By these operations,
ground has been placed;on the X wiring (assuming that 35 busy test relay 330 will restore. After a short duration
the sloW-to-release relay 350 will restore to close a cir
this wiring is used), from ground, contacts 245, con
cuit to the switch-through relay 360; the circuit extending
ductor C204, contacts 263, conductor C205, wiper 22d,
Upon receipt of the second dialled digit “1,” line relay"
230 will intermittently restore to close a circuit to the
rotary magnet 325 over a circuit from ground, contacts.
232, 243, 262, conductor C302, contacts 335, 365, wind
Thereafter, relay 360 closes the ringing frequency to the
called line and returns ringback tone in a manner pre
ing of’ the rotary magnet 325 to battery. The rotary mag 45 viously described.
It is is assumed that When the call was originated, line
net 325‘ will thus energize to rotate the wipers 391-396
1 had been found idle, busy test relay 330' wouldnot have
to their respective ?rst rotary bank contacts. Over the
operated. In thiscase, the call would have been extended
above-mentioned rotary circuit, the slow-to-release relay
over the ?rst set of wipers in a manner previously de
340 also operates, closing at contacts 341 an‘ alternate
path for itself and the rotary magnet 325. At contacts 50 scribed, utilizing line 1. and PBX trunk 50;.
We have thus described av connector which” will deter
342 an obvious circuit to relay 350 is closed. Relay 350
mine Which set of wipers will be utilized by the receipt’
operates, opening points at contacts 351 and 352 in the
of a ?rst predetermined digit on a ?rst type‘ of call, and
prepared circuits for “Wanted Tone” and “Busy Tone”
will‘ switch wipers when a ?rst line is busy, without any
respectively. At contacts 354 busy test circuit for busy
relay 330 is closed from control wiper 393 of the ?rst set 55 automatic rotation thereof on a second type of call.
a For night service, and also for special calls during the
of wipers. Also, assuming for the present that'the X wir
ing isbeing used, at contacts 356 the ground on the X
day, it may be desirable to eliminate the automatic trunk
wiring is closed to slow-to-release relay 3201. Relay 3201
selection so' that only the Wantedline of the two lines
will thus operate closing contacts 321 to prepare a point
will. be called. This can be done by'pre?xing the digit
in the application of the “Wanted Tone” to the called 60 “1” or “2” to the connector call number.. The pre?x
line. Assuming the use of Y wiring containing the per
digit “1” operates relay 270 so that relay 380 cannot op
manent ground, relay 320 would operate as previously
erate even though the upper line is busy as previously
described‘.v At the termination of this last digital impulse
series, the wipers will be engaged with their respective
described. The pre?x digit “2” would also operate relay
270- but, in addition, it operates relay 380 so that only the
?rst‘ bank contacts on the sixth level, and the circuits to 65 lower line is called.
the rotary magnet 325 and relay 340‘ will be opened at
contacts 232. Relay 340 subsequently restores its con
tacts to- normal after a slow-to-release interval of time.
It will thus be seen from the pre
ceding description that this switch could have only thev
PBX service or only, the one and two~party service if there
were enough of either service to warrant ?lling the con
Assuming ?rst that line 1 corresponding to PBX trunk
nector.
50, is found busy, ground will be encountered in the usual 70
While there has been described what is at ‘present con
manner by control Wiper 393, which will cause the busy
sidered to be the preferred embodiment of the invention,
test relay 3301 to operate. Relay 3150‘, being slow-to-re
it will be understood that various-modi?cations may be
lease, will permit relay 330- to' close at contacts 336 a cir
made therein, and it is intended to cover in the appended
cuit to relay 380 before relay 350 restores. This last
claims all such modi?cations as fall‘ withinthe true spirit
circuit extending from battery, winding of relay 380, 75 and scope of the invention.
3,087,023
9
10
What is claimed is:
1. In a telephone system, a calling station, a connector
switch of the two motion type, means for extending a
connection from said calling station to said connector
connection from said private branch exchange to said
?rst set of terminals, a second set of terminals accessible
by only said second set of wipers, a second path terminat
ing a connection from said private branch exchange to
switch, a plurality of private branch exchanges, a plurality
I‘ saidsecond set of terminals, stepping means operated in
response to receipt of a ?rst and a second series of digital
impulses over said, connection for simultaneously stepping '
both said wiper sets in a primary motion and thereafter
in a secondary motion into respective engagement with
said ?rst and said second set of terminals, testing means
of two-party lines, a ?rst plurality of levels of bank con
tacts on said connector terminating connections with each
party of each said‘ two-party-lines, a pair of lines indi
vidually to each private branch exchange, a second plu
rality of levels of bank contacts terminating connections 10
operated subsequent to the termination of said wiper
stepping for testing the busy or idle condition of said ?rst
path connection with said private branch exchange over
with each line of each said pairs, a ?rst and a second set
of wipers in said connector with each wiper set constitut
ing one of the two means of access to each two-party
line and to each private branch exchange, stepping means
said ?rst set of terminals, means operated in response to
operated for stepping said two sets of wipers simultane 15 a busy condition existing on said ?rst path for connecting
said testing means to test the busy or idle condition of said
ously in a primary and then a secondary motion in re
second path connection with said private branch exchange
sponse to a ?rst and second series of digital impulses re
over said second set of terminals without additionally
ceived over said connection, testing means for testing the
stepping said Wipers, a source of wanted tone, and means
busy or idle condition of a called two-party line in one
case and for testing the busy or idle condition of said 20 operated by said testing means in response to a busy con
dition existing on said second path for momentarily con
lines of said pair individual to a called private branch
necting said source of wanted tone to said second path for
exchange in another case, means operated in response to
informing said private branch exchange of an awaiting
said wipers stepping into engagement with selected bank
call.
contacts in said ?rst plurality of levels in accordance with
4. In a telephone system, a calling station, a connector
said primary and said secondary movements for connect 25
ing said testing means to test the selected two-part line
to determine the busy or idle condition of only one party
thereon, and means operated in response to said wipers
stepping into engagement with selected bank contacts in
said second plurality of levels in accordance with said 30
primary and said secondary movements for connecting
said testing means to test the busy or idle condition of
said second line of said pair individual to the selected
private branch exchange in response to the ?rst line of
said pair being busy.
switch of the two motion type, means for extending a
connection from said calling station to said connector
switch, a private branch exchange, a ?rst and second set
of wipers in said connector switch, stepping means for
stepping said two sets of wipers simultaneously in a pri
mary and then a secondary motion in response to a ?rst
and second series of digital impulses received over said
connection, a pair of auxiliary wipers in said connector
switch stepped simultaneously in only said primary mo
35 tion with said ?rst and second sets of wipers, a ?rst setof
terminals accessible by only said ?rst set of wipers for ex
tending a connection to said private branch exchange
2. In a telephone system wherein means at a calling
station is operated to transmit impulses corresponding to
over a ?rst path, a second set of terminals accessible by
dialed digits over a connection comprising a switch train
to directively control a connector switch in'successive
with of a plurality of two-party lines, a ?rst and a second
only said second set of wipers for extending a connection
to said private branch exchange over a second path, test
ing means connected with said ?rst set of wipers and
set of wipers in said connector switch, stepping means in
said connector switch operated in response to receipt of
impulses corresponding to a ?rst dialed pre?x digit for
busy or idle condition of said ?rst path connection with
said private branch exchange over said ?rst set of termi
primary and secondary movements, the combination there
simultaneously stepping said wiper sets only in said pri
operated subsequent to said wiper stepping for testing the
45
nals, and wiper selecting means operated by said auxiliary
wipers in response to a busy condition existing on said ?rst
mary movement, wiper set selecting means normally
path for connecting said testing means with said second
routing connections from said connector to said ?rst
set of wipers to test the busy or idle condition of said sec
wiper set, means for operating said Wiper set selecting
ond path connection with said private branch exchange
means only in response to said pre?x digit being a certain
predetermined numerical value for routing said connec 50 over said second set of terminals without further stepping
said Wipers.
tions from said connector to said second wiper set, wiper
5. In a telephone system, a calling station, a connector
release means, means operated in reponse to the termina
switch of the two motion type, means for extending a
connection from said calling station to said connector
nector terminals accessible by said wiper sets and indi 55 switch, a private branch exchange, a ?rst ‘and second set
of wipers in said connector switch, stepping means for
vidually terminating each party of each of said two-party
stepping said two sets of wipers in simultaneously in a pri
lines, said stepping means reoperated in response to re
tion of said pre?x digit impulses for operating said wiper
release means to restore said wiper sets to normal, con
ceipt of impulses corresponding to the dialing of two digits
following said pre?x digit for simultaneously stepping both
mary and then a secondary motion in response to a ?rst
and second series of digital impulses received over said
said wiper sets in said primary and said secondary mo 60 connection, a pair of auxiliary wipers in said connector
switch stepped simultaneously in a primary motion with
tion successively to simultaneously engage said terminals
said
sets of wipers, a wiper switching relay, a ?rst set of
terminating both said parties on a called two-party line
terminals accessible by only said ?rst set of wipers for
corresponding to said dialed two digits, a signal source
extending a connection to said private branch exchange
in said connector, and means for extending the signal from
said source to signal a particular one of said parties on 65 over a ?rst path, a second set of terminals accessible by
only said second set of wipers tor extending a connection
said called two-party line over one of said wiper sets
to said private branch exchange over a second path, test
selected for use by said wiper set selecting means in ac
ing
means connected with said ?rst wiper set and oper
cordance with said numerical value of said dialed pre?x
digit.
ated subsequent to said wiper stepping for testing the busy
nection from said calling station to said connector switch,
a private branch exchange, a ?rst and second set of wipers
in said connector switch, a ?rst set of terminals accessible
by only said ?rst set of wipers, a ?rst path terminating a 75
circuit means prepared by said primary motion of said
3. In a telephone system, a calling station, a connector 70 or idle condition of said ?rst path connection with said
private branch exchange over said ?rst set of terminals,
switch of the two motion type, means for extending a con
auxiliary wipers to said wiper switching relay, means
operated by said testing means in response to a busy con
dition existing on said ?rst path for completing said cir
3,087,023
12
11
cui-t means to operate said wiper switching relay, and
means operated by said‘ Wiper switching relay for discon
meeting said testing means from saidv ?rst set- of‘wipers
and connecting said'testi'ng means to said second set of
wipers, whereby-the busy. or idlecondition of said second
path connection with- said‘ private branch exchange is
tested over said second'set of terminals without further
stepping - said‘ wipers.
References Cited in the ?le of this patent
UNITED" STATES PATENTS
1,636,160
2,087,398
2,278,752
2,419,282
2,510,011
2,791,635
W-icks _______________ __ July 19,
Dixon ___________ __>____ July 20,
West et ‘a1. ___________ .__ Apr. 7,
Ostline _____________ __ Apr. 22,
1927
1937
1942,
1947
Corbett ______________ __ May 30, 1950
Bakker _______________ .... May 7, 1957
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 138 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа