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Патент USA US2106881

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Feb. l, 193%“
F._WOLF
2,106,881
TELEPHONE SYSTEM
Filed Feb. 10,_ 1956
2 Sheets-Sheet l
INVENTOR.
N
x,32
:3
|-
.
FRITZ WOLF
BY..
.
ATTORNEY.
Feb. 1, 1938.
F. WOLF
2,106,881
TELEPHONE SYSTEM
Filed Feb. 10, 1956
2 Sheets-Sheet 2
(TSt.2
ATTORNEY.
2,106,881
Patented Feb. 1, 1938
UNITED STATES
PATENT
OFFICE ‘
2,106,881
TELEPHONE SYSTEM
Fritz Wolf, Birkenwerder, near Berlin, Germany,
assignor to Siemens & Halske Aktiengesell
sch-aft, Wernerwerk, Siemensstadt, near Berlin,
Germany
Application February 10‘, 1936, Serial No. 63,114
In Germany February 2-7, 1935
8 Claims.
(Cl. 179-17)
This invention relates to a circuit arrangement
for remote communication systems and more es
pecially for telephone systems in which a plu
rality of lines extending in various traiiic direc
5
tions are in connection with a plurality of con
necting paths by way of a common connecting
line, leading to an exchange and a junction point
in the latter.
In the case of outgoing calls unde
sired switching-over operations in the connecting
10 devices of the exchange, caused by the speaking
path to the calling subscriber’s line not being
completely established in due time, are prevented,
and at the same time an ef?cient impulse trans
mission is ensured, in that a potential which is
1 connected up under the in?uence of a call initiat
ing impulse, and serves to in?uence controlling
means in the connecting devices, is disconnected
after the call has been initiated in the exchange
but not before the speaking line has been switched
20 through to the calling line.
The present invention is concerned with means
for preventing disturbances in operation by in
?uencing the controlling means in connecting de
vices of an incoming connecting path, while main~
2 taining e?icient impulse transmission in the case
of outgoing calls. This is accomplished accord
ing to the invention in that an auxiliary potential
is applied to the connecting path of a line which
is to be used in a speaking connection and which
30 is connected to the exchange by way of a‘ connect
ing line common to other subscribers’ lines, for
the purpose of in?uencing controlling means
(feeding bridges) in connecting devices in the ex
change transitcrily in the case of outgoing calls
35 and in the case of incoming calls throughout the
duration of the latter.
By means of the arrangement according to the
invention it is possible for this principle, which
renders e?icient impulse transmission possible in
40 the case of outgoing calls and consists in con
necting up an auxiliary potential only transitorily
in the case of outgoing calls, also to be used in
systems in which the called subscriber can take
up and replace his receiver a number of times.
45 On account of the auxiliary potential being con
nected throughout the duration of the incoming
call, the in?uencing of the feeding bridge in the
incoming connecting path, which occurs when the
receiver is replaced again after having been taken
‘)0 up and causes undesirable switching operations, is
effectively prevented.
In the embodiment so-called two-party line
systems are shown in which two subscribers’ sta
tions Whose lines are brought together at a switch
5
ing point are connected to a switching-over point
(UStZ) by way of a common connecting line. The
invention is, however, not limited to two-party
line systems. It is also possible for more than
two subscribers’ lines to be associated at the
switching-over point UStl, and also in place of
subscribers’ stations, connecting lines, party lines
or the like may be connected up.
In the drawings, Fig. 1 shows an arrangement
of the invention, while Fig. 2 shows a modi?ca
tion thereof.
In the embodiments two subscribers’ stations
TStl and 'I‘StZ are shown whose lines are con
nected to the switching-over point UStZ to the
exchange devices in which an individual approach
to preselecting devices (preselectors or call ?nd 15
ers) is provided for each subscriber’s station of
the two-party line. Intercommunication between
the two subscribers of the two-party line is not
possible.
The manner of operation of the arrangement
according to Fig. 1 is as follows: If a subscriber,
for example, the subscriber at station TStl wishes
to set up a call he takes up his receiver and there
by closes the circuit for relay RI in the switching
over point UStZ: earth, battery, winding I of re
25
lay RI , contact ltl, contact 2152, a-lead of the con
necting line, winding I of relay Ul, contact 3u2
line to subscriber’s station TStl, contact 411,2,
winding 11 of relay Ui, contact 5ul, earth. Relay
III which is situated in this circuit does not ener
30
gize. Relay R! is energized, however, at the
switching-over point UStZ and by closing its con
tact 6H connects earth to the a-lead over contact
1H, while over contact 81"! battery through choke
coil Dr! is connected to the b-lead. The pre 35
selector W! is accordingly set in motion in
known manner.
When it finds a free group se
lector GW relay T in the preselector is energized
in the known manner and switches through the
line to the group selector over contacts 9t and Hit. 40
Relay T! at the switching-over point UStZ is ac
cordingly energized over the circuit: earth, bat
tery in the group selector, a-lead, preselector
VWl, contact 9t, winding I of relay Tl, contacts
61'! and ‘it! and earth. Relay '1'! looks up over 45
contact Hi! and resistance W2‘! and its winding
II. Blocking potential is connected to the ?nal
selector approach of the second subscriber over
contact l5tl so that this is protected against in
coming calls. Moreover, the opening of contact
lZtl and the closing of contact it‘tl effects the
switching-over of the junction at the switching
over point USt2. By the closing of contact Hit!
the battery potential connected to the a-lead in
the group selector G-W operates directly on relay 55
2
2,106,881
III at the switching-over point UStI. Relay Ui
is accordingly energized and opens its contact
coil DrI on the energizing of relay RI, as in Fig. 1,
and remains connected up until relay RI re
MI and closes its contact I5uI so that the speak
leases when the speaking path is ?nally switched
through to the calling line.
ing path is switched through at the switching
over point UStI.
Meanwhile, the slow operating relay RI has
?nally released at the switching-over point UStZ
and by closing contact I6rI has switched through
the b-lead of the speaking line to the group se
10 lector in a metallic circuit while shunting cone
denser CI.
Since contacts SH, SH, I‘IrI, and I8rl
are now open there are now no switching means
associated with the speaking path which are capa
ble of distorting the impulses.
15
Corresponding operations are brought about
when a call is initiated from the subscriber’s sta
tion TStZ. While a call is in progress from one
subscriber’s station the other subscriber’s station
In the case of incoming calls relays RI and TI UK
are energized over winding II, as in Fig. 1. Over
contact 8rI relay RI connects auxiliary potential
to the b-lead and thus prevents the transmission
of the criterion for “toll knock down”. In place
of a second winding of relay RI a special aux 10
iliary relay I-II can be provided which connects
the auxiliary potential to the b-lead over its con
tact hI and the choke coil DrI. The further
switching operations correspond to those in
Fig. 1.
15
In order to ensure the energizing of relay TI,
winding II of this relay can in the case of out
going calls be connected over resistance WiI
is completely disconnected from the connecting
and contact 2211 so that it is pre-magnetized
line on account of the opening of contacts 3112
and M2 or ISuI and 20m.
without being energized.
In the case of incoming calls, for example to
subscriber T‘StI, a circuit is established for re
lays RI and TI after the ?nal selector has tested
25 on the appropriate contact: earth in the ?nal
selector LW, c-lead, winding II of relay RI , con
tact 2H2, winding II of relay TI, battery, and
earth. Relays RI and TI energize in this circuit.
By closing contact I4tI relay TI switches through
30 the a-lead of the speaking line while the switch
ing-over of the junction is effected’ by the closing
of contact I 3tl. In order to prevent undesired
When the switching
through to the group selector GW takes place
only a small amount of energy is necessary to
cause the relay TI to energize over its winding
I. Also in the case of incoming calls the ener
gizing of relay TI can be ensured in a special
manner if a third low resistance winding is pro
vided in the incoming c-lead in series with wind
ing II, this facilitating the energizing of relay
TI over its winding II.
What is claimed is:
1. In a telephone system, a. common line, tele
phone lines branched from one end of said com
30.’
switching operations from being brought about in mon line, connecting lines branched from the
the preceding selecting device GW if, in contrast . other end of said common line, switches in each
35 to the conditions obtaining in the case of indi
phone lines, means responsive to an incoming call
on switching over points UStI and UStZ must ?rst
mon line and one of said connecting lines into use
be operated, an auxiliary potential is applied
to the b-lead of the connecting. line over con
tact 8rI: earth, battery, choke coil DrI, contact
8rI, b-lead to the ?nal selector. By this means,
the criterion for “toll knock down” is prevented
45 from being produced in preceding selecting de
vices GW. This auxiliary potentialremains op
erative throughout the duration of the incoming
call. For the purpose of balancing the sub
scriber’s line a choke coil D12 is connected over
50 contact I'IrI, while over 22M and the choke coil
D13 earth potential is applied to the b-lead of
the connecting line leading to the switching~
5.5
connecting line for extending calls from said tele- ‘
vidual subscribers’ outgoing calls, wherein the
loop is not immediately closed when the sub
scriber calls, because the switching over device
over point UStI. When the called subscriber
replies relay UI energizes over the earth applied
by way of contact 51d and locks up after closing
its contact I5uI over contact 2211 and the choke
coil Dr3.
'
On the release of the connection relays UI
and RI deenergize on account of the release of
the ?nal selector LW. Moreover, relay T in the
preselector is connected in parallel with the relay
TI (winding II) so that this also returns to its
rest position and the switching-over devices are
accordingly restored to normal.
65
The second embodiment is differentiated from
the ?rst only in the construction of the switching
over point USt2, the difference being in the ar
rangement of the bridge for connecting the aux
iliary potential which in this case consists only
of the choke coils DrI, Dr! or Dr3, Drll. The
b-lead of the speaking line is ‘permanently
switched through at the switching-over point
Ust2 in a metallic circuit; On initiating an out
going call auxiliary potential is connected to the
57.5 b-lead of the line over contact Srl and the choke
over either connecting line or an outgoing call on
one of said telephone lines for taking said com‘
to the exclusion of the other telephone line and 40
connecting line, switching means in said connect
ing line operated responsive to the call to apply an
auxiliary potential to the connecting line to in?u
ence the switches thereon, said switching means
operated transitorily responsive to an outgoing
call and for the duration of an incoming call.
2. In a telephone system, a common line, a. pair
of telephone lines branched from one end of said
common line, a pair of connecting lines corre
sponding‘to said telephone lines branched from 50
the other end of said common line, switches in
each of said connecting lines for extending calls,
means responsive to an incoming call or an out
going call for taking the common line and one
of the connecting lines into use to the exclusion 55
of the other telephone line and connecting line,
a relay in the connecting path taken into use, said
relay operated momentarily in the case of an out
going call and continuously in the case of an
incoming call, and means controlled by the opera—
tion of said relay for applying a particular poten
tial to the connecting line in order to control the
operation of the switches on the connecting line.
so
3. In a telephone system as claimed in claim 2
in which the switching through of the connect 65
ing line the common line and the telephone line
in a loop circuit to the associated switches is
interrupted transitorily by the relay responsive
to an outgoing call and responsive to an in
coming call for the duration of the same.
YO
4. In a telephone system as claimed in claim 2
in which the common line telephone line and
connecting line ‘are switched through in a loop -
circuit to the associated switches and in which
the relay connects the auxiliary potential transi
2,106,881
torily to the line in the case of outgoing calls and.
for the duration of an incoming call, and in which
in the case of the incoming call the auxiliary
potential and the breaking of the loop circuit to
the switches takes place at the time when the
connecting line corresponding to the wanted tele
phone line is engaged.
5. In a telephone system, a common line, a pair
of telephone lines branched from one end of said
10 common line, a pair of connecting lines branched
from the other end of said common line, switches
in each of said connecting lines for extending
calls, means responsive to a call for taking one
of said telephone lines the associated connecting
15 line and the common line into- use, said lines
adapted to be switched through in a loop circuit
to the associated switches, a relay in the con
necting line operated transitorily responsive to
an outgoing call and for the duration of an in
20 coming call, said relay connecting an auxiliary
potential to the connecting line and interrupting
the loop circuit extending to the switches in order
to effect a control of the same, said relay oper
ated in the case of an incoming call over the
25 testing circuit for the connecting line and in the
case of an outgoing call over one side of the con
necting and telephone lines.
3
6. In a telephone system as claimed in claim 5
in which the other telephone line and the other
connecting line are disconnected from the com
mon line when the ?rst telephone and connect
ing lines are engaged in a call, and in which said
other telephone and connecting line is guarded
from seizure on an incoming call while said ?rst
lines are in use.
'7. In a telephone system as claimed in claim 5
in which a further auxiliary potential is applied 10
by the relay to one side of the connecting line
responsive to an outgoing call in order to initiate
the operation of the switches, and in which the
said further auxiliary potential is disconnected
by an auxiliary relay operated responsive to an 15
incoming call.
8. In a telephone system as claimed in claim 5
in which a further potential is applied by the
relay to one side of the connecting line respon
sive to an outgoing call in order to initiate the 20
operation of the switches, and in which the said
further auxiliary potential is disconnected by an
auxiliary relay operated responsive to an incom
ing call, said auxiliary relay operated over the
incoming testing circuit simultaneously with said 25
?rst relay.
FRITZ WOLF.
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