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Патент USA US2072234

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March 2, 1937.
E. WOCHINGER
2,072,234
TELEPHONE METERING SYSTEM
Filed July 15, 1935
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INVENTOR.
EDUARD WOCHINGER
mg,
ATTORNEY.
Patented Mar. 2‘, 1937
2,072,234
UNITED STATES PATENT OFFICE
2,072,234
TELEPHONE METERING SYSTEM
Eduard Wochinger, Berlin, Germany, assignor to
Siemens & Halske Aktiengesellschaft, Werner
werk, Siemensstadt, near Berlin, Germany
Application July 15, 1935, Serial No. 31,355
In France July 26, 1934
13 Claims.
The present invention relates to telephone
systems with main and subsidary exchanges and
automatic operation. The general object is di~
rected to improving these systems by making
as them more dependable and ei?cient by avoiding
the disturbances which occur especially during
‘the setting up of calls and during metering, by
means of auxiliary devices of the simplest pos
,
‘
10
sible form.
According to the invention the metering op
eration occurring at the end of a call is prevent~
ed from being disturbed by the premature re
lease of the call, in that a relay located in the
, main exchange and associated with the con—
' necting line between the main and subsidiary
exchange, and which maintains the outgoing
connections of the subscribers of the subsidiary
exchange, is held energized during the metering
, operation which takes place after the clearing
‘signal has been given.
‘> 'Since the meters provided for metering the
outgoing calls of the subsidiary exchange sub
scribers are centralized in the main exchange, it
is convenient also to in?uence these same me
ters in the case of internal calls, in order to
avoid the necessity of additional metering de
vices. This isachieved according to the invention in that, in thecase of internal calls between
‘subscribers of the same subsidiary exchange, and
from among the meters centralized in the main
exchange belonging to subscribers connected to
the subsidiary'exchange, the meter of the calling
station is connected up by switching means in
the, main exchange characterizing the calling
subscriber,
'
Besides the special formation of the switching
devices of the main exchange, the construction
of the subsidiary exchange devices formaking
. , the systems with- main and subsidiary exchanges
40 more dependable and e?icient is of particular
importance.
Thus, for example, the necessary
disconnection of the other subscribers’ lines from
a common calling circuit has previously been ef
iected by relays common to several subscribers’
4:5 lines. Since for the satisfactory working of the
system the common relays can only be provided
with a de?nite number of contacts the arrange
ment of several common relays is always neces
5 sary in those cases when the number of sub
scribers’ lines exceeds a de?nite number. Ac
cording to the invention the number of ~these
common relays is reduced in that in the normal
condition of the selectors of the subsidiary ex
the subscriber’s lines attached to these
55 change
are connected to the calling circuit passing to
the main exchange partly over contacts con
trolled by the selectors of the subsidiary ex
change, and partly over the‘ contacts of relays,
‘ common toseveral subscribers.
(Cl. 179-9)
Three separate embodiments of the invention
are illustrated in Figs. 1, 2, and 3.
In Fig. 1 a subsidiary exchange UA without
batteries is shown as an embodiment of the in
vention, which has access to a main exchange
HA over the connecting line consisting of two
leads. The connection of the subsidiary ex
change subscribers to this connecting line takes
place over a selector DBIll which for outgoing
calls acts as a call ?nder, and for incoming calls
‘is set by numerical impulses as a ?nal selector.
In the normal condition of the system relay U0,
and further relays (LII, LIZ) in case the con
tacts to be provided for each subscriber cannot
be operated by one relay, is operated over one 15
lead of the connecting line. These relays con
nect all the subscribers of the subsidiary ex
change in common to the calling circuit through
their working contacts and on deenergizing which
occurs when a subscriber calls, cause a switch
20
ing over of the calling circuit so that the indi
vidual subscribers can be tested. In order to
reduce the number of relays of this kind to a
minimum, contacts operated mechanically by the
selector of the subsidiary exchange are used for 25
this purpose, for example Iwlli (I-—I'I) and
which are opened on the ?rst switching motion
of selector DBIB and remain open until position
The setting of selector DBIIl in the subsidiary
exchange UA always takes place under the con
trol of the main exchange HA, both in the case
of outgoing calls, when the selector is acting as
a call ?nder, and also in the case of incoming
calls when the selector is acting as a ?nal se
lector.
'
35
.
As already mentioned, in the normal condition
of the system relay LII], and, if present, also re
lays LII and LIZ are energized, over the circuit:
earth, relays LIE, LII, LIB, wiper a in position 40
0, winding I of relay U! 0, lead a. of the connect
ing line, contacts Z‘IcIl], 391mm, wiper dIVIIl in
position 0, contact 43x10, winding I of relay XI 0,
battery, earth. In this circuit only relays LII],
LII and LIZ are energized, while relay XII] does 45
not receive su?icient current.
Outgoing traj?c
When subscriber AI of the subsidiary exchange
takes up his receiver the following circuit is set
up: earth, contact 20am, winding II of relay
UIB, wiper b in position 0, lead bI, subscriber
AI, lead aI, contact Iwl0 (I—I‘I), wiper a in po
sition O, winding I of relay UH), lead a, contacts
Z‘IcIll, 39anlll, wiper dIVIU in position 0, contact 55
43ml ll, winding I of relay Xi ii, battery, earth. Be
sides the transitory energizing of relay UI U relay
XII] also energizes in this circuit and locks up
by the closing of contact 42:11:!0 in series with its
Winding II. The circuit just described passing 60
22
In
pulses by short circuiting the choke coil DTIO
the subsidiary exchange relays LIB, LI I and LIZ
release so that the switching magnet Wit of the
at contact 39MB during the emission of the im
pulses, and disconnecting the condensers (con
tacts 282219 and 29mm.
The connecting devices of the main exchange
are set in the desired direction by the various
impulse trains in any suitable manner}, with
over the a lead is opened at contact 43mm.
selector in the subsidiary station is connected to
the 1) lead over contact 23 I II). The following
circuit is thus set up through the main exchange:
earth, contact 23 I I8, switching magnet WID,
10
contact came, lead b, contacts 24cm, liaylll, relay
Kill, battery, earth. In this circuit both the
which we are not concerned, and the desired sub
switching magnet Wit) in the subsidiary exchange
It should be noted that the meters of the 10
subsidiary exchange subscribers are centralized in
the main exchange. In order now to be able to in
?uence the corresponding meter when a subscriber
and also relay Kit in the main exchange are
energized so that the switching device in the
subsidiary exchange is advanced one step. Con
tact 52km switches on the switching magnet DIE
in the main exchange through contact 53MB,
so that the wipers d I I?—d IV Ill operated by
this switching magnet D I 0 also advances one step.
Through contact Eldld, which is operated each
time switching magnet Dill energizes, relay Yl?
2,0 is energized over: earth, contact E'Idl?, resistance
Will, winding I of relay YIEl, battery, earth.
Thereupon the energizing circuit of switching
magnet Wit and relay Klll, completed over the
b-lead of the connecting line, is broken at con
25 tact GB'JIG.
Switching magnet DH! is likewise
disconnected by the opening of contact 5270“).
The interaction would if necessary be repeated
again and accordingly both the switching device
DBIt in the subsidiary exchange and also the
30 switching device in the main exchange would be
advanced in step. Since, however, the subscriber
AI of the subsidiary exchange, connected to the
?rst contact is calling, the testing relay PI 0,
which after the occurrence of each step is con
35 nected to the a-lead over contact lltylll, is ener
gized in the main exchange after the first step.
This testing circuit is completed through: earth,
contact ZQuIIl, winding II of relay Ulii, wiper b
in position I, lead bl, subscriber AI , lead a I, wiper
40 a in position I, winding I of relay UII], lead a
of the connecting line, contacts Z'Iclll, 390mm,
wiper cZIVIE! in positions I-II, contacts Mm“),
45ylil, relay PIG, battery, earth. In the same
circuit relay Ulti is energized in the subsidiary
45 exchange. By the closing of contact 58pm, re
lay Ylti is next maintained energized over its
winding I, while by the opening of contact 2mm,
the switching magnet W18 of the switching de
vice in the subsidiary exchange is cut off. The
50 earth previously connected over contact Zllulil
is replaced by earth connected over contacts
24cm, G'Iylil, (36km and choke coil Dr‘II, by'the
opening of contact wall} and the closing of con;
tact ZIuIil, so that complete symmetry exists
55 between the two speaking leads, and no unbal
ance occurs in the subsidiary exchange. By the
closing of contact 3Iplll a loop is also closed for
seizing the exchange connecting devices, so that
for example a presele-ctor can be set in operation
after whose setting relay Cor is energized. The
subscriber receives a dialling signal. He can then
~ commence dialling.
On operating the dial the relay P I ll in the main
exchange used for testing while the selector is
65 being set releases intermittently according to the
‘ impulses, while relay UII! in the subsidiary ex
change remains energized on account of its con
struction as a slow acting relay. Relay YI I? simi
larly holds up in the main exchange during the
70 impulse emission. Contact 3Iplil transmits the
‘ impulses to the connecting devices of the main
exchange by interrupting the line loop. On the
?rst release of relay Pill relay VII} is in?uenced
since contact 5Izrlll is also closed. The latter
relay ensures a clean transmission of the im
scriber is then rung in the known way.
sets up a call the meter is connected over a wiper
of the switching device in the main exchange 16
which controls the setting of the selector in the
subsidiary exchange and is thus advanced in
step with the latter. When the conversation has
?nished a meter impulse is transmitted over the
lead 0, in any way, with which we are not con
20
cerned, which influences the meter SMI allocated
to the calling subscriber. A second winding of
relay YII] lies in the meter circuit and on ener
gizing maintains the connection existing between
the main exchange and the subsidiary exchange 25
so that even when the calling subscriber re
places his receiver no release of the selector DBIU
in the subsidiary exchange or of the switching de
vice in the main exchange can take place during
the metering process. If at the moment that the 30
selector of the subsidiary exchange is engaging a
subsoriber’s line during the further switching
after the termination of the conversation, the
subscriber of the line in question takes up his re
ceiver, the connecting line leading to the main 35
exchange can immediately be seized again. Since
the selector of the subsidiary exchange has ad
vanced in step with the switching device in the
exchange, in this case also the meter correspond
ing to the subscriber reached is again connected
to the c-lead.
If a new call does not take place, both switching
devices are advanced to position II through the
alternating play of the above mentioned relay.
In the main exchange relay HI 0 energizes in this 45
switching position over contact 38yl0, wiper d III
I I) and resistance Wz'l, and by opening contact
53MB prevents the switching magnet DIO from
being operated again and the consequent fur
ther switching of the corresponding wiper. The 50
switching magnet WID in the subsidiary exchange
is further operated, however, by the alternate play
between relays KIU and Ylll, since the correspond
ing selector has to carry out I ‘I steps to reach the
zero position. This is continued until the selector 55
DBIll in the subsidiary exchange reaches position
II. In this position relays LIB, and LII and LIZ,
now energize over: earth, relays LIZ, LII, LII],
wiper a in position I‘I, winding I of relay UIIJ, lead
a of the connecting line, contacts 210“), 390mm, 60
@Bhlii, resistance Wz'5, battery, earth. Relay LIII
cuts off the operating circuit of switching magnet
WIO, at contact 23ZIO, so that relays KIO and YII)
in the main exchange can also no longer energize.
By the opening of contact 38g/I ll relay HID deener
gizes and opens the circuit for the L-relay passing
over the a-lead, at contact 41mm. Thereupon this
relay again deenergizes. Through the closing of
contact 231m the operating circuit of switching
magnet W III passing over the b-lead of the con
necting line is again closed so that the selector in 70
the subsidiary station makes one switching step
(into the normal position). By relay KIO ener
gizing in the operating circuit of switching magnet
WI ll the switching magnet of the switching device
3
2,072,234
in the main exchange is now operated over con
tact 52km, so that this switching device also
makes one step, likewise into the normal posi
tion. Thus both are now standing again in posi
tion 0. On reaching this position the condition
existing when the system is at rest is again set
up (L-relay energized).
The number of steps of the selector in the sub
sidiary exchange are known to be larger than
10 the number of steps of the switching device in
the main exchange. Since, however, in order
to actually connect up the motor of the calling
LI2 in the normal condition of the system ism-n
broken, so that these relays deenergize. seizing
from the subsidiary exchange is not possible since
relay Pill which is otherwise used for testing is
disconnected and the selector is brought to rest
through setting the switching device in the main
exchange under the control of the seized testing
lead. By the closing of contact 232 I I] after the re
lease of relay LIO the operating circuit for the
switching magnet passing over the b-lead is closed 10
in series with relay KID. Both switching devices
now move synchronously as was described above
subscriber through the switching device in the
for the case of the call of a subscriber of the sub
main exchange, the switching device and the
sidiary exchange. The advancement now, how
15 selector in the subsidiary exchange must be
ever, takes place until the wiper d I I0 comes to (15
synchronous, the arrangement is such, as de
scribed above, that the motion is synchronous
until the 11th contact, i. e. until the ?rst contact
without any subscriber’s connection, whereupon
20 the selector in the subsidiary exchange travels
over the, remaining contacts and then accom
rest on the calling lead 05.
plishes the last switching step together with the
switching device.
This release motion is
achieved in that up until the 11th contact the
=, relays Kill, Yili and the magnet DH) produce im
' pulses for advancing both switching devices,
whereupon the magnet Dlil is disconnected from
the impulse producing circuit and by a switch
ing over process (HID) impulses are only pro
- duced through relays’KHl and Yl0 for the mag
net Will. In position I‘! this then causes a re
d I‘ I0, contact 320mm, relay CHI, battery, earth.
By the opening of contact 24cm the operating
circuit of magnet WI!) and also the control circuit
for the magnet DIB are broken. The speaking
leads are switched through to the ?nal selector
by the closing of contacts 250“) and 26010. The
ringing current is: transmitted to the desired sub
scriber from the ?nal selector in any of the known 25
ways, and passes over the a-lead of the connect
ing line of the subscriber’s station in the subsid
iary exchange and the earth in the subsidiary
station . connected over contact Zilul?.
Ifv the
ringing current were connected over the b-line, 30
then obviously the a and bi-leads must be inter
versal of the change-over device so that for the
changed.
last switching step the circuit ?rst operative
comes into operation again, together with the
When the called subscriber replies the ringing
current is disconnected by the completion of the
loop in the ?nal selector, and by the energizing 35
of relay U i 0 over the speaking leads contact 2 i ul III
, switching magnet Di ii.
Incoming tml‘?c
change must take in order to be set on their con
If they were previously subscribers
nections.
45 having individual lines to the main exchange they
can retain their original call numbers unaltered.
Only the c-lead from the ?nalselector has to be
.
disconnected from their previous connections and
led to a contact of wiper d I ID.
_
is closed so that now lead I) of the connecting line
The subscribers attached to the subsidiary sta
tion can obviously also be called from the main
40 station. The last digit of their call‘ numbers
corresponds, for example, to the number ofsteps
which the selector DB“! in the subsidiary ex
The a.- and 1)
50, leads of all subscribers’ ‘lines incoming from the
?nal selector are‘ connected together in parallel.
Thus both subscribers attached to the same level
55
When this occurs re
lay ciil energizes over the circuit: lead 05, wiper,
is also switched through to the main exchange.
The desired subscriber is now connected to the
calling subscriber.
40
After the termination of the conversation lead
05 is cut off from the ?nal selector in any desired
way, so that relays Cl 0 and Ania, which had es
tablished a locking circuit over contact 35cl0,
release.
In the subsidiary exchange relay UN) is 45
deenergized so that the operating circuit for mag
net Wlil in the subsidiary exchange and for relay
K"! in the main exchange is again completed over
the b-lead of the connecting line. By relay Kill,‘
the magnet DIE} of the selector in the main ex
change is switched on through contact 52km.
Thus the reciprocal play between the two switch
of a final selector and also those attached to dif
ferent levels of the same ?nal selector or in par ing devices, already described, causes the ad
ticular to different ?nal selectors are incorporated vancement into the normal position in the 55.
in the subsidiary exchange while maintaining manner described in the case of the release for
their call numbers.
‘
an outgoing connection.
Special circuits
. If a ?nal selector (notshown) is set in any man
ner on the line leading to the subsidiary exchange
for the purpose of calling subscriber A5, testing is
carried out, in the known way, over the lead 05
thus seized, as to whether the line leading to the
apartment house exchange is free. If this is not
the case, Wiper d III H! has left its position 0,
If the selector in the subsidiary exchange is 60
displaced from position or by hand, and the two
switching devices thus become out of step, relays
Llil, Li I, LI2 deenergize since the normal circuit
is broken at wiper a of the selector. The magnet
engaged signal in the known way.
If on the contrary, the line leading to the sub
Will is connected in an operating circuit through 65
the closing of contact 23110, the circuit being com
pleted as in the case of a call over relay Kit in
the main exchange and the lead 2) of the connec
in a circuit dependent upon wiper d III iii, via
the control of the impulse circuit in the main ex
65 so that the lead 05 incoming from the ?nal selec
tor is open and the calling subscriber reveives an
sidiary exchange is free relay Anlll is energized ting line running between the main exchange and
over the lead 05 (lead 05, resistance Wi9, contact the subsidiary exchange. The magnet DIE} in the 70.
36010, relay Anlll, wiper 01 III IE] in position 0, main exchange is switched on by relay Kill, so
resistance Wi'l, battery, earth). Relay Anlil lies that both switching devices are advanced under
contact Man I 0. Through the opening of contact
change.
391ml [I the circuit existing for relays LIB, Li I and
are not synchronous the possibility of .a sub-: ,‘
Since in this case both switching devicesv
4
2,072,234
scriber who hangs up during the advancement
into the normal position, causing the connecting
line leading to themain exchange to be seized
must be prevented, for otherwise the meter of an
other subscriber would be operated in the main
exchange. This is prevented in that through the
displacement of the selector in the subsidiary
exchange by hand, in contrast to the procedure
in a normal call, relay K20 is energized in the
10 main exchange, so that the testing relay PIG in
the main exchange is not connected over contact
44mm, i. e. this relay cannot test and thus the
advancement of the switching device into the
normal position cannot be interrupted. For the
15 rest the release motion occurs in the same way
as after the normal establishment of a call i. e.,
advancement in step until the‘ eleventh contact of
the switch in the main exchange is reached, then
the selector of the subsidiary exchange is con“
20 trolled alone until position H, and then the last
step to the zero position is accomplished by both
switching devices in common.
The two switches
are thus again in corresponding positions.
The same switching operations take place
25 when the switching device of the main exchange
is displaced from the zero position by hand.
In this case the wiper d IV l0 cuts off the
a.-lead oi the connecting line so that relay X10
cannot be energized. seizing during the release
30 motion is thus prevented. By the interruption of
the circuit existing in the normal condition re
lays Ll0, Li! and LI2 again deenergize, where
upon the magnet Wl0 in the subsidiary exchange
is again connected in an operating circuit over
35 contact 23 l 10, and is influenced by the recipro
cal play of relays KM and Yl0, partly together
with the switching magnet DH) in the main ex—
change, and partly independently, as mentioned
above, until the zero position is reached. They
40 can then operate synchronously again when the
next call is set up.
Each seizing of the devices in the main ex
change can be indicated by a seizure lamp L.
If desired, each seizing direction can be indicated
45 speci?cally, if the contacts 559310 for the out
going seizing and 56anl0 for the incoming seiz
ing are wired separately.
In Fig. 2 a subsidiary exchange UA without
batteries is shown as a further embodiment of
50 the invention. Several subscribers are attached
to this subsidiary exchange who can reach a
connecting line leading to a main exchange HA
over a selector DB20. The setting of the selector,
which for outgoing calls acts as a call ?nder, and
55
for incoming calls as a ?nal selector, is controlled
in each of the two directions by a switching de
vice in the main exchange. In order to reduce
the number of relays in the subsidiary exchange
60
When subscriber Al of the subsidiary exchange
wishes to make a call he takes up his receiver
and operates the earthing key 3-! attached to
his station. Relay X20 in the main exchange is
thereby operated over the d-lead of the connect
ing line (earth, key BI, contact 20lw20 |—Il)
which is operated mechanically by the switching
device DB20 so that it is open in positions I—l1,
d-lead, relay X20, wiper d IV 20 in position 0, 10
contact 2l2h20, resistance Will, battery, earth.
Relay X20 establishes a locking circuit for itself
independent upon wiper dIV 20 by closing con
tact 2|5X20. By closing contact 213x20 the fol
lowing circuit is set up: earth, magnet W20 of 15
selector DB20 in the subsidiary exchange, c-lead
of the connecting line, contacts 223y20, 224020,
relay K20, contact 2| 3x20, resistance Will, bat
tery, earth. In this circuit the magnet W20
energizes in series with relay K20. The selector 20
DB20 in the subsidiary exchange takes a step
forward whereupon its mechanically operated
contact 29lw20 (l-I‘l) opens and its mechani
cally operated contact 202w20 (l—l6) closes, so
that the transitory depression of the key Bl suf 25
?ces to bring about the calling condition.
As already stated relay K20 energized together
with the magnet W20 so that the magnet D20
of the switching device in the main exchange is
also switched on, over contact Zl9k20, and hence 30
the switching device in the main exchange ad
vances one step. By the energizing of magnet
D20 contact 2l0d20 is closed so that relay Y20
is energized over this contact and resistance Wil.
By the opening of contact 2231120 the current 35
is cut o? from the magnet W20 in the subsidiary
exchange and relay K20 in the main exchange.
Magnet D20 is also cut oil‘ from its energizing
current by the opening of contact 2.!97020, so
that by the opening of contact 2I0d20 relay 40
Y20 is again deenergized. Contact 223y20 is
thus again closed so that the switching mag
net W20 in the subsidiary exchange and the
relay K20 .in the main exchange can be ener
gized again. This alternating play is continued
until the selector in the subsidiary exchange has
reached the position of the calling subscriber.
Since in the present example the subscriber AI
attached to the ?rst contact of selector DB20 is
calling, the advancing terminates after one step,
and on reaching this calling subscriber the fol
lowing circuit is set up: earth, contact 205:1:20,
winding II of relay Y20, contact 206001‘, a-lead
of the
in the
scriber
sidiary
connecting line, wiper a of the selector
subsidiary exchange in position I, sub 55
Al, wiper b of the selector in the sub
exchange in position I, b-lead, contact
201cm, relay Lr, battery, earth. Relays Y20
as much as possible, auxiliary leads are led oii
and LT are energized in this circuit so that a
from the speaking leads to the subscriber. More
further advancement of the switching device is 60
prevented by the opening of contact 223y20.
Relay Y20 for producing the impulses for the
selector of the subsidiary exchange and for the
switching device in the main exchange thus
over, the connecting line between the main ex
change and subsidiary exchange is made of four
wires, of which one of the two auxiliary wires
65 serves for extending the calling impulses from
the subsidiary exchange to the main exchange,
and the other for extending the setting im
pulses transmitted from the main exchange to
the selector of the subsidiary exchange. By this
70 arrangement it is only necessary to provide the
magnet W20 for the selector DB20 serving for
connection to the subscribers, without further
relays being necessary. These wires of the con
necting line carry no current in the normal
condition of the system.
serves also as a testing relay When setting up 65
outgoing calls. Relay Lr seizes connecting de
vices in the main exchange in any known man
ner.
A pre-selector or a call ?nder can thus,
for example, be set in operation which estab
lishes a connection with a free numerical im
pulse receiver in the exchange. When such a
numerical impulse receiver is reached relay Cor
in the main exchange is switched on over the
c-lead.
Relay Y20 which maintains the con
nection with the subsidiary exchange is held
2,072,234
energized through its winding III over the c-lead
in parallel with relay Cor and in series with the
meter SM!‘ connected over wiper 11 II 20. The
meter itself is not yet operated in this circuit.
By the opening of contacts 206001‘ and 201001
leads a- and b- are disconnected, so that the
subscriber of the subsidiary exchangeis switched
throughPas ‘a normal individual line subscriber
without any unbalance.
10 ,By sending out impulses which operate on the
corresponding numerical impulse receiver in the
exchange (not shown) , the calling subscriber can
set up the desired call.
‘ When the calling subscriber has ?nished his
15 conversation the call metering takes place. The
meters of all the subsidiary exchange subscribers
are centralized in the main exchange. The meter
corresponding to the calling subscriber is con
nected through a wiper of the switching device
20 1120 which is set synchronously with the selector
in the subsidiary exchange. Metering now takes
place in that metering impulses are transmitted
to the meter SMI of the calling subscriber AI
which is connected through the switching device,
25 by increasing the strength of the current. Re
lay Y20 is held energized in this circuit over
its winding III during the metering. Relay Y20
does not release until, after the metering, the
c-lead is disconnected. By the closing of con
30 tact 2231/20 the circuit of relay K20 and switch
ing magnet W20 passing over the c-lead to the
subsidiary exchange is then again closed. The
switching device is now advanced into the rest
position as in the case of setting on the calling
35 subscriber’s line in that the circuit for both
switching devices is again made and broken
through the alternating play between magnet
W20 and the relays K20, Y20 and themagnet D20.
Both run synchronously so that when the se
40 lector DB20 comes to a calling subscriber’s line
both switching devices are immediately brought
to rest in the manner already shown, and con
necting devices are seized in the main exchange.
If no new call has ‘been initiated, relay H20 is
45 energized in position ll of the switching device
in the main exchange, the circuit being: earth,
battery, resistance Willi, wiper (2 III 20 in posi
tion ll, contact 2251120, relay H20, earth. By
the opening of contact‘2l8h20 the magnet D20
50 is cut off, so that the impulses produced in the
main exchange only through relays K20 and Y20
now only in?uence the magnet W20 in the sub-g -
5
brought to the normal position together through
the last step.
Incoming traffic
The subscribers who are attached to the; sub- ;
sidiary exchange receive as the last digit of their
call numbers the number of the steps which the
selector in the subsidiary exchange has to make
corresponding to the setting of the ?nal selector
in the main exchange. Should they previously ‘10
have been individual subscribers they can retain
their previous call numbers unaltered. Only the
c-lead ofthe ?nal selector is disconnected from
the previous subscriber’s bank positions and is
led to a contact of the Wiper d1 20, which cor
responds to the contact of the selector in the sub
sidiary exchange. The a- and b-leads of all in
coming subscribers’ lines are connected in par
allel.
If the line leading to the subsidiary exchange 20
is already seized, the wiper d III 20 is away from
the rest position so that the testing ?nal selector
?nds no potential for testing. The calling sub
scriber receives the busy signal in the normal
way. If on the other hand the line is free then 25
assuming subscriber A6 is the desired subscriber
the ?nal selector tests on lead 06, whereupon re
lay An20 is energized. Relay A1120 locks up in
dependently of wiper (1 III 20 over its contact
226 c.1220, while contact 2I4cm20 connects bat 30
tery to the c-lead leading to the subsidiary ex~
change. Relay K20 is thus energized in themain
exchange and switching magnet W20 in the sub
sidiary exchange.
The alternating play between '
the magnet W20 and relays K20 and Y20, which is 35
operated through the magnet D20, and which
has already been described in the case of estab
lishing an outgoing call, now sets in, so that both
switching devices are rotated synchronously
until wiper d1 20 stands on the incoming lead 00. 40’
Relay C20 connected through contact 222an20
now energizes over this lead and at contact
224020 breaks the operating circuit (lead 0) for
the magnet W20 and the relay K20. Both switch
ing devices are brought to rest. Previously con 45
tact ZZTG'ILZU connected earth to the winding of
relay C01‘ so that this relay energized and pre
vented the connecting line from being seized
from the subsidiary exchange, by opening con-.
tacts 200001‘ and 201001‘. Through the closing of 50'
contacts 203020 and204c20 the desired sub
scriber’s line is switched through to the ?nal
selector. It is now connected to the ?nal selector
contact bank just as a normal individual sub
sidiary exchange. When the selector in the sub
sidiary exchange reaches position I 'l the mechan
scriber. The subscriber can now be rung in any
55 ically operated contact 202w20 (I —IB) is opened,
among others, and thereby relay K20 is deene known way, after which, when the desired sub
ergized in the main exchange. Since contacts scriber replies, the speaking connection is es
tablished.
On the termination of the conversation lead
06
is cut off in the ?nal selector, so that relay 60
60 and of relay K20 in‘ the main exchange is then
prevented. Accordingly, relay Y20valso releases C20 releases. Contact 224020 again closes the
operating circuit for the switching magnet W20
through the opening of contact 2l9k30, where
upon the opening of contact 225y20 relay H20 is in the subsidiary exchange and relay K20 in the
also deenergized. By the closing of contact main exchange, passing over the 6- lead of the
65 2l2h20 a circuit is again set up through: earth, connecting line, so that the selector in the sub
sidiary exchange and the switching device in
magnet W20, c-lead of the connecting line, con
213.120 and 2|2h20 are open a further operation
‘ of the magnet W20 in the subsidiary exchange
tacts 223y20, 224020, relay K20; wiper d IV 20 in
position I--l I, contact 2l2h20, resistance Wii I,
battery, earth. The selector in the subsidiary
70 exchange takes a further step which brings it to
the normal position whereupon by the closing of
contact 2|0k20 the switching device D20. in the
main exchange is also operated, over contact.
2l8h20, and by taking one step is brought to the
75 normal position. Thus both switching devices are
the main exchange are both advanced under com- ‘
mon control. As has already been described in
the case of the release of‘ an'outgoing call the
selector in the subsidiary exchange is advanced.
to position H synchronously with the switching
device in the main'exchange and is then ad
vanced, after relay R20 has energized, to position
[1, while the switching device in the main ex—_
change remains still. The last step i. e. the ad
6
2,072,234
vancement into the normal position is again ac
complished synchronously with the switching de
vice of the main exchange. A fresh seizure in
either direction can only occur when both switch
ing devices have reached the normal position.
Special circuits
If the selector in the subsidiary exchange is
displaced from the normal position by hand, the
10 two switching devices are thus brought out of
step, and earth is attached to the d-lead of the
connecting line leading to the main exchange,
by means of contacts 202w20 (l—l0) whereupon
relay X20 is immediately operated as in the case
of a call proceeding from a subscriber in the sub
sidiary exchange. The locking circuit of relay
X20 is completed by the closing of contact 2 I 5x20.
By contact 2|3x20 the magnet W20 is held until
relay K20 has also switched the wiper of the
switching device in the main exchange into po
sition I, so that they are once more in. step.
When relay Y20 then energizes over contact
2l0d20, the c-lead is then cut oil so that the cir
cuit over the c-lead is broken. Through this
25 alternating operation the switching devices are
returned to the rest position synchronously as in
the case of the release motion.
If on the other hand the switching device of
the main exchange is brought to the normal po
sition by hand the c-lead to the subsidiary ex
change is likewise'connected up over Wiper ct IV
20, and the magnet W20 in the subsidiary ex
change is energized in series with relay K20.
In this case also both switching devices are con
‘itrolled in the manner already described until
they reach the normal position.
Since, how
ever, in this case, under some circumstances the
switching devices are not working synchro
nously i. e. they have become out of step, because
40 the switching device in the main exchange can
be moved on by hand quicker than the switch
ing device in the subsidiary exchange, the pos
sibility of seizing under these conditions must be
prevented. This is achieved in that the testing
45. relay Y20 of the connecting line can only draw
up over the loop of the calling subscriber when
the contact 205x20 has been connected to the
a-lead of the connecting line.
Since, however,
relay X20 is not energized this is not possible, so
50 that the line of a subscriber of the subsidiary ex
change who is calling under these circumstances
is prevented from being seized.
Each seizure of the connecting line lights up
the seizure lamp L. In series with this lamp the
seizure can also be recorded. If desired each
seizing device can be recorded separately, in
which case contacts 220x20 and 22|c20 are wired
separately.
In Fig. 3 a system with a main and subsidiary
60 exchange is illustrated as an additional embodi
ment of the invention. This in addition to the
outgoing and incoming calls enables connections
to be set up between subscribers of the same sub
sidiary exchange. For this purpose, in addition
65 to selector DB30 which serves for setting up out
In order to differentiatebetween the di?erent
call directions i. e. outgoing exchange calls and
internal calls, an additional switching device is
provided (magnet Di30, wipers dz‘ I 30—d2' IV 30)
in the main exchange which is switched round
according to the characterizing number dialled so
that either a call is set up over the connecting
devices of the main exchange, or the auxiliary
selector Lw30 in the subsidiary exchange can
be set on the desired subscriber’s connection.
In the present embodiment the characterizing is
arranged so that by dialling the digit 1 an out
going exchange call is characterized, while by
dialling the subscriber’s number directly i. e. any
digit except 1, an internal call and thereupon the
subscriber desired in the internal call, is char
acterized.
The characterizing digit for the outgoing ex
change call is not taken up by the connecting de
vices in the main exchange, but only by the 20
characterizing switching device and the auxiliary
selector Lw30 is provided in the subsidiary ex~
change.
In the normal condition of the system all the
selectors both in the subsidiary exchange and also
the switching devices in the main exchange and
in addition all the relays, are unin?uenced.
Outgoing calls
When a subscriber takes up his receiver and .
momentarily depresses the key, for example B2
in the case of subscriber A2, earth is connected
to lead al of the connecting line leading to the
main exchange. In the main exchange relay X30
energizes over the circuit: earth, battery, resist
ance W119, wiper d II 30, winding I of relay X30,
contacts 345x30, 348M130, 350030, lead al, wind
ing I of relay U3l, wiper al of selector DB30 in
position 0, key B2, earth.
Relay X30 locks up
over its winding II on closing its contact 375x30.
Contact 345.1130 disconnects battery from the
lead al of the connecting line. Contact 337x30,
however connects battery to the bi lead. The
following circuit is then set up: earth, magnet
W3l, contact 300u3l, bl lead of the connecting 45
line, contacts 335030, 331x31, 3300230, 3421130, re
lay K30, battery, earth. In this circuit the mag
net W3l energizes in the subsidiary exchange and
relay K30 in the main exchange, so that selector
DB30 in the subsidiary exchange advances one
step. Similarly the switching device influenced
by the magnet D30 in the main exchange is ad
vanced one step, after this magnet has been
energized over contact 3|6lc30. On the energiz
ing of this magnet contact 3l0d30 is closed and
thus relay Y30 is switched on over resistance
Wz'24. This relay opens its contacts 3421/30,
among others, so that the operating circuit of
magnet W3I and relay K30 is broken, so that
these are both deenergized. By the opening of
contact 3l6k30 magnet D30 is also deenergized
which again ‘results in the opening of contact
3| M30 and hence the deenergizing of relay Y30.
Contact 342y30 is again closed and thereby the
operating circuit for magnet W3! and for relay 65
going and incoming calls (exchange calls) and
K30 is set up afresh, so that selector DB30 in
thus works as a double purpose selector, a sec
the subsidiary exchange and the switching de
ond selector LW30 is provided in the subsidiary
vice in the main exchange which is in?uenced
exchange which serves to set up internal con
by relay K30, advance a further step.
Since the calling subscriber A2 is connected to 70
70 nections within the subsidiary exchange. This
auxiliary selector is connected over an auxiliary
line (112 hi?) between the subsidiary exchange
and main exchange to the connecting line lead
ing to the main exchange which is seized by call
75 ing subscribers.
the second contact of selector D330, on reaching
this contact, after relay Y30 has operated as be~
fore after the completion of the second switch
ing step, the following circuit is set up: earth,
battery, relay P30, contacts 3411/30, 346x30,
2,072,234.
348M230, 350030, lead al of the connecting line,
winding I of relay U3l, wiper al of selector DB30
in position 2, subscriber A2, wiper bl of the same
selector in position 2, winding II of relay U3l,
contacts 301u3l, 3061032 (|—I'l) (mechanically
operated by LW30), earth. It should be noticed
When the desired subscriber is reached, after
testing on the contact in the normal way, ring
ing current is transmitted and the speaking con
nection is established on the desired subscriber
replying.
When the conversation has ?nished
a metering impulse is transmitted on the c-lead
that the connection of the testing relay P30 to
in any desired manner which does not concern
lead all by relay Y30 takes place after each step
us here.
of the switching device in the main exchange.
1:0 By the closing of contact 3191730 relay Y30 is
‘ held energized so that by the opening of contact
342y30 further transmission of impulses for ad
vancing the switching device is prevented. Earth
is connected to lead bl over contact 3401/30 and
. the choke Dr3l, so that after opening contact
301u‘3l and closing contact 303u3l the follow
ing locking circuit is set up for relay UM, ener
gized in the above testing circuit: earth, choke
coil Dr3l, contacts 34lk30, 3401/30, wiper 11 IV 30
2.0 Lin position l--| I, contact 335030, lead bl of the
connecting line, contact 308u3l, winding II of
relay U3l, wiper bl of selector DB30 in position
2, subscriber A2, wiper a! of selector DB30 in po
sition 2, winding I of relay U3l, lead al of the
This is extended to the meter SM2 in
the main exchange corresponding to the calling
subscriber of the subsidiary exchange. The con
necting of the corresponding meter takes place
on the setting of selector DB30 in the subsidiary
exchange by the switching device in the main ex
change controlling this selector.
By the switching on of winding II of relay
Y30 in the c-lead, which relay assists in sending
out the control impulses, theexisting connection
is prevented from being released during this
metering even when the calling subscriber re
places his receiver and thereby releases relay 201
P30 which lies in the circuit of the speaking cur
rent. When the metering is completed and the
calling subscriber replaces his receiver relays P30
and 133i deenergize.
Since a locking circuit no
3541130 a loop is closed for the connecting devices
of the main exchange so that, just as in the case
of a subscriber having an individual line, a pre
longer exists for relay Y30 in the c-lead it is
disconnected by the opening of contact 3|3p‘30
so that it deenergizes. At contacts 342y30 and
309u3! the operating circuit through magnet W3!
and relay K30 in series is closed again, so that
,i. selecting device, for example a call ?nder, ‘is set
now, in the same way as for the setting of
3 connecting line, contacts 350030, 348an30, 3465030,
‘3411130, relay P30, battery, earth. At contact
in operation. After the setting of such a prese
selector DB30 on the calling subscriber, this is
lecting device, if the‘calling subscriber is con
again controlled synchronously by the switching
nected to a free connecting device he received
a signal from the exchange.
Since it is an outgoing call which is being set
up in the present case, the subscriber must dial
the characterizing digit I. It should be added
that relay J30 was energized over contacts 3243030
and 3261130 and also over wiper dz’ III 30 in posi
40 tion 0, so that contact 3541030 which was closed
by the testing relay P30 which operates as the
impulse relay during the numerical selection is
shunted by contact 355730. The selection of
the characterizing digit I is accordingly not
transmitted to the connecting devices of the
device in the main exchange.
If the selector
DB30 thus moves on to a subscriber’s line in‘
which the subscriber has just taken up the re
ceiver, seizing can at once take place again, since
both the selector in the subsidiary exchange and
the switching device in the main exchange
both in the same switching position, so that
meter in the main exchange corresponding to
calling subscriber is also connected up when
are
the
the‘ to
the
switches are brought to rest. If such a call does
not occur,- and selector DB30 and the controlling
switching device in the main exchange accord
On the ?rst impulse i. e. on the
'ingly
the main
reachexchange
position over:
H, relay
earth,
E30battery,
energizes
relay,
in
?rst deenergizing of relay P30 the magnet Di30
of the characterizing switching device is oper
ated in the main exchange over contacts 324x30,
E30, wiper (1 III 30 in position I I, contact 324x30,
earth. Relay E30 establishes a locking circuit.
for itself over its contact 363e30. The operating
main exchange.
_321.p30, and 328730, and relay V30 is operated
in parallel with the magnet; moreover, by the
transitory closing of contact 3151230, battery is
connected over contact 374730 to the b2 lead of
circuit passing over the bi lead is broken by -
contact 330630, and also battery is connected to
lead M of the auxiliary connecting line, so that
now magnet W32 of selector LW30 which stands
in position i is in?uenced in series with relay
K30 of the main exchange. The impulse circuit ca,
the auxiliary connecting line and hence magnet
1W32 of the auxiliary selector LW30 is operated.
By means of relay V30, energized during the im
previously operating magnet D30 is correspond~
pulse emission, the choke coil D130 is short cir
ingly opened at contact 3l2e30 and is switched
cuited by the closing of contact 352030, and by ' over to magnet Di30 of the characterizing selector
the opening of contacts 35lv30 and 3531230 the by the closing or“ contact H3630. The auxiliary
condensers in the speaking leads are disconnected
selector LW30 is accordingly switched on one step,
so as to insure a more clear impulse emission.
and through the energizing of relay K30 in the
After the one impulse has been given relay V30
deenergizes on account of the prolonged open
ing of contact 3211930, so that relay J30, which
same circuit magnet D130 is operated over con
65. after one step has been made holds up over
wiper dz’ III 30 in position I and over contact
325030, is deenergized. The short circuit of im
pulse contact 35llp30 is accordingly removed by
the opening of contact 355:!’30 so that the next
70 ‘impulse trains can be transmitted to the con
necting devices of the main exchange. The mag
net W32 in the subsidiary exchange, which pre
viously displaced the auxiliary selector LW30
one step, can no longer be e?ected since the corre
75i¢sponding impulse is, broken at contact 374730.
tact 3167030, and likewise advances the char
acterizing selector one step. Relay Y30 is oper
ated by the closing of contact 3i'ld2'30, and by
opening contact 3421/30 breaks the operating cir
cuit for the magnet W32 and relay K30. Contact '
3l6lc30 is accordingly opened, so that by the dis~
connection of. magnet D230 and the associated
opening of contact 3i'l’di3, relay Y30 is deener
gized and the operating circuit for magnet W32
and relay Y30 is again closed. This alternating
play is repeated until the characterizing switch
ing device has reached position H. When this
occurs relay H30 is operated over wiper d2‘ I30
8
2,072,234
and contact 3161/30, and hence contact 3Mh30
is opened which now breaks the impulse circuit
for magnet D230 and connects relay Y30 directly
in this impulse circuit. Relay X30 deenergizes
on the opening of contact 3‘l2h30. The auxiliary
selector LW30 is moved on further by means of
10
15
20
25
30
impulses from the main exchange, but there the
characterizing switching device does not move
with it. The switching device LW30 continues
to be advanced until it reaches position H. In
this position earth is connected to the lead a2
over wiper a2 of the switching device LW30.
Thus relay U32 is energized in the following cir
cuit: earth, wiper a2 of switching device LW30
in position l'l, winding I of relay U32, lead a2
of the connecting line, contact 3447130, resistance
Wil9, battery, earth. By the opening of contact
302u32 the switching magnet W32 is disconnected
and also the circuit of relay K30 is broken. The
current is cut off from relay Y30 by the opening
of contact 3l0k30 so that this relay opens contact
3611/30 and deenergizes relay H30. Contact
344h30 is opened and the energizing circuit of
relay U32 described above is broken down. Con
tact 302u32 again closes the operating circuit
for magnet W32 and relay K32, so that selector
LW30 in the subsidiary exchange advances one
step and likewise the magnet D130 energized over
contact 3l07c30 advances the characterizing
switching device in the main exchange by one
step. Accordingly both switching devices accom
plish the last step into the normal position to
gether. In the position 0 of wiper 031' I 30 relay
E30 remains energized over contacts 364.7139 and
35 365e30 until, since relay Y30 is energized over
contact 3lldz'30 through the last switching step,
relay H30 is again energized over: earth, wiper
(ii I 30 in position 0, contacts 305e30, 368x30,
relay H30, battery, earth. By the opening of con
40 tact 36471.30 the locking circuit for relay E30 is
broken and this relay therefore deenergizes. Re
lay H30 holds up, after the opening of contact
365e30
over
contact
31171.30.
After
contact
3lldi30 has opened relay Y30 again deenergizes.
45 By the closing of contact 339e30 relay K30 is
furthermore again connected to the bl lead of the
connecting line and also preparation is made for
switching in the magnet D30 of the switching de
vice in the main exchange in the impulse circuit
60 already described, over contact 3l2e30. There
upon only magnet W3l is operated in series with
relay K30. The latter causes relay Y30 to ener
gize over contact 3l6k30, so that this opens the
energizing circuit of magnet W3l by opening con
55 tact 3421/30. By the alternate play of these relays
the switching magnet is in?uenced until the se
lector DB30 reaches position l1. In this position
the following circuit is set up: earth, wiper al
of selector DB30 in position 11, winding I of
60 relay U3l, lead al of the connecting line, con
tacts 330030, 2400,1130, 345x30, 34471.30, resistance
Wil9, battery, earth. Relay U3l energizes and by
opening contact 309u3l disconnects the magnet
W3l. Relays K30 and Y30 then also release so
65 that now relay H30 is deenergized by the opening
of contact 3611/30. Through the closing of con
tact 3l4h30 the switching magnet D30 in the main
exchange is connected up while the energizing
circuit just described for relay U3l is broken down
70 at contact 313M130. The operating circuit for
magnet W3l and relay K30 is accordingly closed
again at contact 309u3l. The selector DB30 is
thus advanced one step» and moves into the
normal position. At the same time magnet D30
75 is also in?uenced by the closing of contact
3l6h30 so that the switching device in the main
exchange similarly make one switching step
which takes it into the normal position.
Since
the wiper d IV 30 of this switching device has
now left contact segments l-l I further advance
ment of the switching devices is not possible. All
the devices both in the subsidiary and also in the
main exchange are now again in the normal
position.
Incoming tra?ic
10
If a subscriber of the subsidiary exchange, for
example A2 is called from the main exchange,
a ?nal selector, which is not shown, is set by the
corresponding numerical selection. If the con
necting line leading to the subsidiary exchange is 15
already seized the wiper d I 30 is not in the normal
position, so that the ?nal selector cannot test
over the c-lead. (02) corresponding to the desired
subscriber. The wiper d I 30 remains away from
the normal position as long as any of the switch 20
ing devices of the connecting line either in the
main exchange or in the subsidiary exchange are
displaced from the normal position. Seizing the
connecting line over a ?nal selector is only pos
sible when all these switching devices have 25
reached the normal position. In the present case
the ?nal selector tests over the lead 02 corre
sponding to the subscriber A2. The circuit
passes over resistance Wi20, contact 350030, relay 30
A1130, wiper d I 30 in position 0, contact 369a1t30,
resistance Wz'22, battery, earth. Relay A1230 en
ergizes in this circuit and locks up independently
of wiper d I 30 over contact 3590,1130. At contact
348cm30 battery is disconnected from the al 35
lead of the connecting line, so that no seizure of
the connecting line can take place from the sub
sidiary exchange. At contact 336111230 battery is
connected to lead bl of the connecting line,
through relay K30. The following circuit
is thus set up: earth, magnet W3I, contact
309u3l, lead bl of the connecting line, con
tacts 335030, 336an30, 3391130, 3421/30, relay K30,
battery, earth.
By the alternate play between
magnet W3l and the magnet D30 in the main
exchange operated by relays K30 or Y30 (as de
scribed in the case of outgoing traf?c), the
selector DB30 in the subsidiary exchange is now
advanced synchronously with the switching de
vice in the main exchange operated by magnet 50
D30. This advancement is continued until the
wiper d'I 30 has reached the lead 02 seized by the
?nal selector. At this moment the selector DB30
has also reached the second contact, to which
subscriber A2 is connected. When this occurs 55
relay C30 tests over contact 36 lcm30 and by open
ing contact 335030 prevents both the switching
devices mentioned from being further advanced.
At contacts 334030 and 349030 the speaking leads
of the connecting line are switched over on to the 60
speaking leads of the ?nal selector. Relay A1130
now holds up over contact 351030. Ringing cur
rent can now be sent from the ?nal selector,
which is not shown, to the desired subscriber 65
A2 of the subsidiary exchange in the known way.
When the desired subscriber replies the ringing
current is disconnected in the ?nal selector in
any manner with which we are not new con
cerned.
Relay U3l is operated over the sub
scriber's loop by the feeding current connected
in the ?nal selector, so that the bl lead of the
connecting line is switched through at contact
308u3l, and magnet W3l is disconnected at con
tact 300u3l. The subscriber A2 is now connected
70
9
2,072,234
to the ?nal selector of the main exchange just
as a normal subscriber having an individual line.
When the conversation has ?nished the 02
lead is disconnected in the ?nal selector, relay
C30 being thus deenergized. Contacts 334030
and 33903!) open and break the circuit for the
feeding current, so that relay U3! deenergizes.
One effect of this is that the operating circuit
for magnet W3! and relay K3t is closed through
10 the closing of contact 339ml. Through the al
ternate play of the corresponding relays the se
lector D1333 in the subsidiary exchange is ad
- vanced synchronously with the switching de
vice in the main exchange. Thus, in the same
15 way as was explained in the case of outgoing
traf?c, the selector in the subsidiary station is
?rst advanced synchronously with the switching
device in the main exchange until position !! is
reached. Then it is moved on as far as position
20 I‘! alone by means of impulses from the main
station, whereupon it completes the ?nal step
into the normal position together with the
switching device of the main exchange. During
‘the release motion of the switching devices seiz
25 ing cannot take place again until the two switch
ing devices have returned to the normal posi
tion, since, in the case of an incoming call, re
lay Y33 which takes up the initiation of a call
is otherwise not energized.
wiper b2 of the auxiliary selector LW3 in position
3, winding II of relay U32, contact 303u32, earth.
Since relay R33 is influenced over a second
switch ringing current is transmitted to the de
sired subscriber every three seconds. The call
ing subscriber receives part of this ringing cur
rent as a “free” signal over contact 3!!)1'30.
,
If the desired subscriber replies within a pause
in the ringing i. e. at a moment when relay R3!)
is deenergized the following circuit is set up: 10
earth, contact 503i/L32,‘winding II of relay U32,
wiper D2 of the auxiliary selector LW30 in posi
tion 3, subscriber A3, wiper c2 of the auxiliary
selector LW30 in position 3, winding I of relay
U32, lead a2 of the connecting line, contacts 15
3331233, 332233, 33lr33, winding I of relay P3l,
battery, earth.
In this circuit relays P3! and
U32, energize. Since contact 303u32 is opened
on the energizing of relay U32, the earth neces
sary for holding relays U32 and P32 energized is
connected through contact 3Hp3! and winding
II of relay P3! , after the lead D2 of the connect
ing line has been switched through. Meanwhile
relay J33 is deenergized by the opening of con
tact 32!;13! and relay R33 is deenergized by the 25
opening of contact 369733, so that further trans
mission of ringing current is prevented. The
feeding current for both subscribers is supplied
from the main exchange. For subscriber A2 the
circuit runs from the battery connected to lead 0
.30
Internal calls
, a! and relay P30, to the earth connected through
Seizing the connecting line leading to the main the choke coil D13! to lead 221, while for sub
exchange by the calling subscriber attached to scriber A3 current is fed from the battery con
the subsidiary exchange takes place in the same nected through winding I of relay P3! to lead
35 way as has already been described in the case (12 of the connecting line, to the earth connected 35
through winding II of relay P3! to lead 122.
of outgoing tra?ic. While in the case of outgo
Metering of internal calls takes place by the
ing trail-lo (exchange calls) the subscriber had
“to dial the characterizing digit !, in the case meter SM2 of the calling subscriber A2, con
of internal calls he must now dial the number nected through the switching device of the main
.40 which the desired subscriber has for internal exchange (wiper d II 33), being influenced over 40
contacts 362233, 323133, 3233133, and earth.
calls, immediately. Since the digit ! is em
ployed for outgoing trai?c, the internal numbers
of the subscribers are limited to the numbers 2
to 10. Thus in this case 9 subscribers can be
attached to the subsidiary exchange.
,As described above, relays J33 and V30 are en
ergized during the calling, while relay P30 is in
termittently deenergized by the impulses, so that
if, for example, the calling subscriber A2 desires
50 a‘ connection to subscriber A3 and accordingly
dials the digit 3, magnet W32 received three im
pulses over the lead 172 and contacts 31473!) and
3151030 (impulse contact). The auxiliary se
lector LW33 is thus set on the third contact.
55 The characterizing switching device is advanced
synchronously by its magnet D539 to the third
contact. After the dialling relay V33 is deen
On the termination of the conversation, when
the calling subscriber replaces his receiver re
lays P33 and U3! deenergize. Contact 3l9p30
opens and relay Y3!) is thus deenergized, while by 45
the opening of contact 3331230 relay P3! is de
cnergized. By the closing of contact 342y33 bat
tery is connected to the b‘! lead of the connecting ,
line over relay K30, so that the magnet W3! of
selector D1333 in the subsidiary exchange is 50
energized. By the alternate play which has
already been described above, the selector of the
subsidiary exchange is advanced synchronously
with the switching devices of the main exchange
so that both switching devices are stepped round 55
as far as position !I. In position !! relay H30
again energizes and causes the auxiliary selector
ing devices of the main exchange are not set.
LW33 in the subsidiary exchange to be advanced
in the manner already described, under the in?u
ence of the corresponding magnet W32. The 60
characterizing switch-ing device is switched on
together with this selector. When these two
switching devices reach the normal position by
By the opening of contact 356233 the pro-select
the switching operations described above, the,
ergized‘ and relay Z33 is influenced over: earth,
battery, relay Z33, contact 3631133, wiper dz‘ I 30
60 in position 3, earth. Since the impulse contact
3541033 in the main exchange loop is shunted dur
ing the dialling, by contact 355133, the connect
65 ing device in the main exchange is now no longer
seized.
Since relay J 3!! remains energized over:
earth, contacts 3231/30, 322733, 32ip3l, wiper di
III 33, relay J33, battery, earth, relay R33 is
operated over: earth, battery, relay R3!) contacts
70 339733, 373233, 3 seconds switch. Subscriber A3
is called by ringing current transmitted from the
main exchange: ringing current source, contacts
353133, 332233, 3331030, lead a2 of the connecting
line, winding I of relay U32, wiper c2 of the auxil
75 iary selector LW3B in position 3, subscriber A3,
selector DB3!) of the subsidiary exchange is 65
moved on automatically under the control of
relays K33 and Y3!) in the main exchange until
it reaches position II. It then completes the
?nal switching step into the normal position to
gether with the switching device in the main 70
exchange.
This short description of the release motion
should su?ice, since a detailed description has
already been given of the release in the case of
an outgoing call.
'
'
75
10
2,072,234
If the called subscriber of an internal call does
not reply, relay P30 releases when the calling
subscriber replaces his receiver, while relay J30
is only released after the release of relay Y30.
Accordingly the earth is disconnected from the
metering circuit by contact 3201/30 before con
tact 323730 closes so that in this case metering
does not take place.
10
Special circuits
If the selector DB30 in the subsidiary exchange
is displaced from the normal position by hand,
earth is connected over contact 30lw3l to lead
a2 over wiper a2 of the auxiliary selector LW30,
15 so that relay X30 is energized in the main ex
change and locks up over contact 313x30. Bat
tery is connected to the bl lead over contact
331x30 and. thus the magnet W3l in the sub
sidiary exchange is in?uenced in series with relay
20 K30 in the main exchange. The selector DB30
is now held until magnet D30 in the main ex
change has been switched on through the closing
of contact 3ll’5k30 whereupon both switching de
25
30
vices are advanced synchronously as in the case
of a subscriber’s call, until they reach position I I.
In this position relay E30 energizes, as in the
case above, and causes the auxiliary selector
LW30 in the subsidiary exchange and the char
acterizing selector (rotary magnet D2’) to ad
vance synchronously to position ll, whereupon
the auxiliary selector continues to advance alone
from the normal position, relay E30 energizes
over wiper di IV 30, and through contact 338e30
completes a circuit for magnet W32 in the sub
sidiary exchange and relay K30 in the main ex
change, so that now the characterizing switching 01
device in the main exchange and the auxiliary
selector LW30 in the subsidiary exchange are ad
vanced synchronously by the interaction as
above. If, for example, at this moment seizing
takes place on the part of the ?nal selector, in the
main exchange, relays A1230 and C30 can be
energized but the selector DB30 in the subsidiary
exchange can only be set when the characterizing
selector Di30 is in the normal position, so that
relay Z30 releases and by closing contact 339030
connects battery to the bl lead of the connecting
line. Each seizure is indicated by the lighting
up of the seizing lamp L. seizing can also be
recorded. If seizing in the incoming and out
going directions is to be recorded separately the
contacts 3'l2h30 and 3'lan30 can be led separately
to a recording device.
What is claimed is:
1. In an automatic telephone system, a main
and a subsidiary exchange, a trunk line connect
ing said exchanges together, means controlled by
a calling subscriber in the subsidiary exchange
for establishing a connection over said trunk line
with a subscriber in the main exchange, a meter
at the main exchange individual to said calling 30
subsidiary subscriber, means for operating said
into position I‘! in precisely the same way as in
meter responsive to the calling subscriber re
the case of the release of an outgoing call, the
placing his receiver to terminate the established
connection, a relay at the main exchange, and
means controlled by said relay for maintaining 35
35 last step into the normal position being executed
together with the characterizing switching de
vice. After this selector DB30 is advanced into
position I‘! and then ?nally into the normal posi
tion the last step being made together with the
40 switching device of the main exchange. If the
magnet W32 of the auxiliary selector is displaced
from the normal position by hand contact
305w32 (l0l7) connects earth over wiper al of
the selector DB30 to the al lead of the connecting
45 line, so that relay X30 is again influenced. In a
manner corresponding to that above, selector
DB30 and the switching device in the main ex
change which is operated by magnet D30, are
again advanced, whereupon after reaching posi
50 tion ll, the magnet W32 of auxiliary selector
LW3£I is influenced synchronously with the char
acterizing switching device D2'30.
The release
motion thus takes the same course as is described
above. If both selectors in the subsidiary ex
change are displaced from the normal position
simultaneously, then since contacts 0 and l are
connected together in the auxiliary selector,
earth is connected to the lead a2 of the con~
necting line over contact 30lw3l, so that again
relay X30 is operated and the release motion de'
scribed above takes place.
If the switching device in the main exchange
which is operated by magnet D30 is displaced
from the normal position by hand, battery is
connected to lead bl over wiper d IV 30, and
hence the selector D1330 in the subsidiary ex
change and the switching device in the main ex~
change are advanced by the known interaction.
All other operations take place as above. In con
trast with the movements described above, the
connecting line cannot be seized during this re
turn motion, because relay X30, which prepares a
circuit for the testing relay P30, is not energized.
If the characterizing switching device which is
75 operated by magnet D130 is displaced by hand
said connection established during the operation
of said meter.
I
2. In an automatic telephone system, a main
and a subsidiary exchange, a trunk line extend
ing betwen said exchanges, means for establish
40
ing a connection from a subscriber in the sub
siduary exchange over said trunk line to a sub
scriber in the main exchange, a meter at the
main exchange associated with the calling sub
sidiary subscriber, a relay at the main exchange
associated with said trunk line and operated to
maintain the established connection between the
subscribers, means for operating the calling sub
scriber’s meter when the established connection.
is to be released, said relay remaining operated
to maintain said connection over said trunk line
during the time said meter is being operated.
3, In an automatic telephone system, a main
and a subsidiary exchange, a trunk line extend- ,
ing between said exchanges, means controlled by
a calling subscriber for establishing a connection
over said trunk line with a called subscriber in
the main exchange, a meter at the main exchange
individual to the calling subscriber, a relay at 60
the main exchange associated with said trunk line,
said relay controlled by said calling subscriber
and operated to maintain the established con
nection over said trunk line, means responsive to
the replacement of the receiver by the calling
subscriber for operating said meter and for main
taining said relay operated to hold the connec
tion over the trunk line until said metering op
eration has been completed although the calling
subscriber has replaced his receiver.
TO
4. In a system according to claim 3 wherein
the relay is operated under control of the calling
subscriber upon the initiation of a call, and held
operated for the duration of the call under con
trol of the calling subscriber and in the circuit of ,
2,072,234
the meter, while when the calling subscriber dis
connects the relay is held energized in the meter
operating circuit alone.
-
5. In an automatic telephone system, a main
and a subsidiary exchange,- a trunk line extend
ing between said exchanges, means controlled by
a calling subscriber for establishing a connection
over said trunk line with a called subscriber in
the main exchange, a meter at the main exchange
10 individual to the calling subscriber, a relay at
the main exchange associated with said trunk
line, said relay controlled by said calling sub
scriber and operated to maintain the established
connection over said trunk line, means respon
15 sive to the disconnection of the calling subscriber
for operating said meter and for maintaining said
relay operated to hold the ‘connection over the
trunk line until said metering operation has been
completed although the calling subscriber has
20 disconnected, said relay being connected in series
with said meter and maintained energized for the
duration of the call by current means to which
said meter is non-responsive.
6. In anautomatic telephone system, a main
25 and a subsidiary exchange, a trunk line connect
ing said exchanges, a selector switch in said trunk
line at the subsidiary exchange, a relay at the
main exchangeassociated with said trunk line,
said relay operated responsive to the initiation
30 of a call from a subsidiary exchange subscriber
to a main exchange subscriber, means controlled
by said relay for operating said selector switch
to establish the connection with the calling
11
line between the exchanges to another sub
scriber in the subsidiary exchange, switching
mechanism at said main exchange associated‘
with said trunk line and operated to control the
setting up of the‘ connection, a meter at the
main exchange for each of said subsidiary sub
scribers, the meter of said calling subscriber
selected and connected up by said switching
mechanism, and means for operating the selected
calling subscriber’s meter, said switching mech 10
anism comprising a selector switch operable to
determine whether the call is to be extended to
another local subsidiary subscriber or to a main
exchange subscriber, said meter operating means
comprising a relay operated only by said switch 15
ing mechanism in the position it assumes when it
determines that a call is to be extended from one »
subsidiary subscriber to another subsidiary sub
scriber. .
11. In an automatic telephone system, a main 20
and a subsidiary exchange, a trunk line extend
ing between said exchanges, means controlled by
a calling subscriber in the subsidiary exchange
for establishing a connection over said trunk line
between the exchanges to another subscriber in 25
the subsidiary exchange, switching mechanism at
said main exchange associated with said trunk
line and operated to control the setting up of the
connection, a meter at the main exchange for
each of said subsidiary subscribers, the meter of 30
said calling subscriber selected and connected
up by said switching mechanism, means for op
erating‘the selected calling subscriber’s meter,
subscriber, a meter for the calling subscriber
at the main exchange, said meter operated
and a relay at the main exchange operated re
sponsive to the answering of the called sub
responsive to the disconnection of the call
ing subscriber, and means for holding said re
sidiary subscriber for operating the calling sub
sidiary subscriber’s meter.
lay operated until said metering operation is
completed, said relay maintaining the connection
12. In a measured service telephone system, a
main exchange, a sub-exchange, a trunk line con
40 over said trunk line and said selector svw‘tch oper
ated during said metering operation.
7. In a system according to claim 6 wherein
the relay is responsive to the initiation of the call
to transmit impulses to the selector switch at
45 the subsidiary exchange to operate the same to
establish the connection and also serves as a
testing relay for said selector to test for the
calling line.
‘
,
8. In‘ an automatic telephone system, a main
and a subsidiary exchange, a trunk line extend
ing between said exchanges, means controlled by
a calling subscriber in the subsidiary exchange
for establishing a connection over said trunk
line between the exchanges to another subscriber
55 in the subsidiary exchange, switching mecha
nism at said main exchange associated with said
trunk line and operated to control the setting up
of the connection, a meter at the main exchange
for each of said subsidiary subscribers, the
60 meter of said calling subscriber selected and con
nected up by said‘ switching mechanism, and
means for operating the selected calling sub
scriber’s meter.
9. In a system according to claim 8 wherein
the switching mechanism controlling the select
ing and connecting up of the meter of the call
ing subsidiary subscriber also is operated to de
termine whether the call is to be extended to
35
necting said exchanges, a ?nder switch in the 40
sub-exchange, sub-exchange subscribers’ lines
terminating in the banks of said ?nder switch
in the sub-exchange, means responsive to the
initiation of a call by one of said subscribers’
lines for operating said ?nder switch to connect 45
said trunk line to the calling line, an auxiliary
switch individual to said trunk line in the main
exchange, a meter individual to each said sub
exchange subscriber’s line terminating in the
banks of said auxiliary switch, and means for 50
operating said auxiliary switch in synchronism
with said ?nder switch to select the meter in
dividual to the calling subscriber’s line.
13. In a measured service telephone system, a
main exchange, a sub-exchange, a trunk line 55
connecting said exchanges, a ?nder switch in
the sub-exchange, sub-exchange subscribers’
lines terminating in the banks of said ?nder
switch in the sub-exchange, means responsive to
the initiation of a call by one of said subscribers’ 60.
lines for operating said ?nder switch to connect
said trunk line to the calling line, an auxiliary
switch individual to said-trunk line ‘in the main
exchange, a meter individual to each said sub
exchange subscriber’s line terminating in the 65
banks of said auxiliary switch, means for oper
ating said auxiliary switch in synchronism with
said ?nder switch to select the meter individual
to the calling subscriber’s line, means for com
pleting the connection over said trunk line to a 70
70 exchange subscriber.
10. In an automatic telephone system, a main ‘called subscriber’s line, and means for there
after operating the selected meter individual to
and a subsidiary exchange, a trunk line extend
ing between said exchanges, ‘means controlled said calling subscriber to charge for the com
by a calling subscriber in the subsidiary exchange pleted connection.
75
EDUARD WOCHINGER.
75 for establishing a connection over said trunk
another local subsidiary subscriber or to a main
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