close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3059065

код для вставки
Oct. 16, 1962
F. P. GOHOREI.
3,059,055
TELEPHONE SYSTEMS
Filed May 5, 1958
l5 Sheets-Sheet 1
Oct. 16, 1962
F. P. GOHOREL
3,059,055
TELEPHONE SYSTEMS
Filed May 5, 1958
15 Sheets-Sheet 2
@3HEÉ»@„oSmQ
VS..i- \,
ÈQ| _ë%
_ è»D
cNS
m
Inventor
` I.' P G‘ohbr-el
BWJz/wa?/f.
Attorney
Oct. 16, 1962
F. P. GoHoREl.
3,059,055
TELEPHONE SYSTEMS
Filed May 5, 1958
l5 Sheets-Sheet 3
Attorney
Oct. 15, 1962
3,059,055
F. P. GOHOREL
TELEPHONE SYSTEMS
Filed May 5, 1958
l5 Sheets-Sheet 4
MJ?
By
‘l
Á Horn e y
@et 16, i962
F. P. GoHoRl-:L
3,059,055
TELEPHONE sYsm/Is
Filed May 5, 3.958
15 Sheets-Sheet 5
Inventor
Ff' 7? Gol-lore'
Oct. i6, 1962
F. P. GOHOREL
3,0599055
TELEPHONE SYSTEMS
Filed May 5, 1958
l5 Sheets-Sheet 6
ÀAf e/f
Inventor
2T' l? Qohor‘e/
Á ttarney
Get. 16, 1962
F. P. GoHoREL.
3,059,055
TELEPHONE SYSTEMS
Filed May 5, 1958
15 Sheets~Sheet '7
Fl .7.l
I),/Ic/ AL/
„c
/YCZ
'
y’d2
Y
I
n
Ó
.-Yc/
y@
_IW/l, /
'
'
yd'
' TR
Inventor
7:7 7? G-aÍ-»one/
By
Attorney
Get. 16, 1962
F. P. GOHOREL.
3,059,055
TELEPHONE SYSTEMS
Filed May 5, 1958
U
|I ,Q
l5 Sheets-Sheet 8
1|l/.iIy
.
O
Ã' Í? Goh one,
BWM/l
' Attorney
Oct. 16, 1962
l
F. P. GoHoREl.
3,059,055
TELEPHONE SYSTEMS
Filed May 5, 1958
l5 Sheets-Sheet 9
HG. l0.
ê/BQ/
5e
BQ _
im]
_
www»
g i
BM`
@d
`513
o
b l//BQZ
Q
Inventor
E P GOA Dre’
BWM!
Attorney
Get. 16, 1962
3,059,055
F, P. GOHOREL
TELEPHONE SYSTEMS
l5 Sheets-Sheet 10
Filed May 5, 1958
MN
Inventor
I.' i? 50AM! _
By
Á ttorney
Oct. 16, 1962
3,059,055
F. P. GoHoREl.
TELEPHONE SYSTEMS
15 Sheets-Sheet 11
Filed May 5, 1958
FYGJZ.
D
D24 002
ID
Inventor
F.' P Gohonel.
B# f »
if Nß
Attorney
Oct. 16, 1962
F. P. GoHoRl-:L
3,059,055
TELEPHONE SYSTEMS
Filed May 5, 1958
l5 Sheets-Sheet 12
E@
E[52E/7.4
/50/5
l
E
5,696
E/
2
£1/
£95
ECD/iff
B¿375 ‘
«fic
. l @g2-Ek'
EC4
Inventor
É' P Gol' or‘e/
BW)
Attorney
Oct. 16, 1962
F. P. GoHoREL
3,059,055
TELEPHONE SYSTEMS
Filed May 5, 1958
l5 Sheets-Sheet 13
FBGJb.
5
E
k2
Inventor
By z
6%'
A ttorn e y
Oct. 16, 1962
3,059,055
F. P. GOHOREL
TELEPHONE SYSTEMS
15 Sheets-Sheet 14
Filed May 5, 1958
FlG. #4m
FQ
Fw@ 62
.gl
i g)
FPI
F66
X52
. F
Arb?
Inventor
Ã' F? @lo h o r‘e/
By
Attorney
Oct. 16, 1962
F. P. GoHoREl.
3,059,055
TELEPHONE SYSTEMS
F11ed may 5, 1958
15 sheets-sheet 15
BW!
A ttorne'y
amate
Patented Oct. 16, 1962
2
always placed, with respect to the selection chain, on the
3,059,055
Fernand Pierre Gohorel, Antony, France, assigner to In
TELEPHONE SYSTEMS
ternational Standard Electric Corporation, New York,
N.Y., a corporation of Delaware
Filed May 5, 1955, Ser. No. 732,912
7 Claims. (Cl. 179-7)
The present invention refers to improvements in tele
phone systems and more particularly in the signaling and
supply bridges used in automatic exchanges.
Each »line or circuit connected to an automatic exchange
is, in general, associated with a signaling bridge or equip
ment designed to send and receive the various signals re
quired for the routing of the call. Now, these lines or
circuits may be of very diiferent types. Some are operated
on direct current, while others are operated on alternating
current of commercial, voice or higher frequencies. The
codes used for signaling may themselves vary from one
circuit to another. There are also simpliñed-signaling
lines or circuits, wherein the signals are sent by supplying
direct current of a predetermined direction and are re
ceived through breaks in the loop or variations of its re
sistance. Such is the case, for example, of the more
common types of lines: subscriber lines, trunks between
local exchanges, etc. In the case of subscriber lines, gen
erally only one supply bridge is provided, common to all
or part of said lines and split by one or more selection
called-end line or circuit.
Another features of the invention is that the standard
means receives from the register all the signals that will
allow it either to operate in conjunction with the calling
end signaling bridge or to adapt itself to simplified-signal
ing lines or circuits.
Another features of the invention is that line Wires are
used to make the changes required in the standard means
of the signaling and supply bridges and that the register
controls these changes on the basis of signals received at
the time of the selections both from the calling and the
called lines.
Therefore, through certain modifications, the called-end
signaling and supply bridge can perform two different
functions: it can operate in conjunction with the calling
end signaling bridge and thus allow the exchange of
signals and controls within the central oiiice or else adapt
itself directly to a simplified-signaling circuit. In accord
ance with a variant, a slightly-different arrangement yield
ing the same result can be adopted.
Another feature of the invention is to allot the bridges
associated with certain lines or with certain circuits at the
called end, some operating in conjunction with a calling
end signaling bridge and allowing the exchange of signals
and controls within the central otlìce and the others sup
plying the calling line directly, arrangements being pro
vided to direct the selectors to an allotted bridge depend
stages. Of course, it must be possible to exchange signals
ing upon the nature of the calling equipment.
and controls between the equipment at the calling and the 30
Other functions can be assigned to the signaling and
called end. Obviously, special equipment can be provided
supply bridges as secondary functions.
for each type of circuit or line, but this procedure com
Another feature of the invention is that signals can be
plicates design and entails an increase in cost. The use
sent from the registers to the signaling and supply bridges
of a single bridge the two sides of which could be modified
for special and nonrecurrent functions such as for deter
in accordance With the type of line with which they are
mination of the tolls or for recording calls, supplementary
associated is often impossible owing to the large number
signals received from said bridges allowing the registers
to do such sending.
of different cases encountered. The invention proposes
to provide a solution for this problem.
Another feature of the invention is that, to take care
The invention also proposes to reduce the number of
of exceptional cases, the signaling and supply bridge can
signaling and supply bridges connected in series, so as to
be eliminated by a metallic connection that allows using
prevent undue attenuation of the connection. It provides
some other bridge or termination meeting the require
a bridge for the calling end and a bridge for the called
ments of such exceptional cases.
end, all other bridges being eliminated.
Var-ions other features will become apparent from the
One of the features of the invention is an automatic
description that follows, given as -a nonlimitative example
telephone system using a selection chain to connect two
with reference to the accompanying drawing, wherein:
lines or circuits and wherein with each line or circuit, or
FIG. l is a wiring diagram showing the normal position
with each line or circuit group, both at the calling and
of the signaling and supply bridges lin an automatic tele
at the called end, is associated a signaling bridge or equip
phone exchange in accordance with the invention.
ment consisting of a combination of two means, the one
FIG. 2 is a variant of the diagram of FIG. 1 explicitly
adapted to the line or circuit and designed to send out
and receive the signals required for the routing of a call
showing the signaling and supply bridges most commonly
found in an exchange having one group-selecting stage.
and the other a standard means that allows exchanging
FÍG. 3 is a variant of the diagram of FIG. 2 for the
signals and controls within the exchange and, possibly,
case of an exchange having two group-selecting stages.
recording certain information required for putting through
FIG. 4 is a variant of the diagram of FIG. 3 for the
a call and determining the tolls thereon, the design of
use of allotted bridges.
these standard means making it possible to simplify manu
FIG. 5 is a variant ofthe diagram of FIG. 1 concerning
facture and reduce the cost.
the case of a small-capacity sub-exchange.
Another feature of the invention is that, when the line
FIG. 6 shows the circuit components required to ex
or circuit at either end of the selection chain requires only
plain the method of sending the various signals between
simplified signaling, certain changes are made inthe stand 60 two bridges located in the same exchange, one at the
ard means of the equipment located at the other end of
originating and the other at the terminating end of the
the selection chain that allow it to adapt itself to the char
selection chain.
acteristics or the operating method of the simplified
FIG. 7 shows a supply bridge arrangement using self
signaling circuit, thus making it possible to use a single
inductance coils and condensers.
bridge for the selection chain, with the consequent saving
FIG. 8 shows a supply bridge arrangement using a
in material and reduction of the attenuation.
transformer.
The arrangements covered by the preceding feature find
FIG. 9 is a block diagram of a signaling and supply
application particularly in the case of subscriber lines or
bridge in accordance with the invention.
of certain lines leading to exchanges and that must always
FIG. l0 shows the application of the FIG. 9 diagram
be supplied.
70 to the case of a line adapter to an exchange receiving the
Another feature of the invention is that the signaling
dialing pulses as multifrequency signals.
and supply bridges comprising modifiable means are
FIG. ll shows the application of the FIG. 9 diagram
3,059,055
¿i
E
to the case of a line adapter to an exchange receiving D.C.
dialing pulses.
-FIG. l2 shows the application of the FIG. 9 diagram to
the case of a line adaptor to a battery supplying exchange.
FIGS. 13 and 13b show the application of the FIG. 9
diagram to the case of a local battery feeder circuit offer
swer required, hanging-up required, etc.). This is a
standard section that does not depend upon the type of
circuit CA and that can be adapted on a definite basis.
Register EN sends feeder ALI another special signal,
Vwhich brings about in section n/s all changes required to
adapt section n/s for operation with section n of adapter
IN1. More precisely, section n/s, which in the case of
a local call supplies calling subscriber AB, in the case here
under consideration detects the various phases of the
FIGS. 14a and l4b show the application of the FIG. 9
diagram to the case of a multiple charge originating line 10 routing of the call (subscriber free, subscriber busy, an
swer required, hanging up required) and sends the cor
adaptor.
responding signals to section n of adapter IN1. Direct
A wiring diagram showing vthe normal position of the
current is generally used for this sending, which is eifected
signaling and supply bridges in an automatic telephone ex
within the same exchange.
change in accordance with the invention will now be de
ing the possibility of establishing a metallic connection
and of having access to party lines.
To route a call from a local subscriber AB to an origi
scribed with reference to FIG. l. To establish a connec 15
nating circuit CD, said circuit is associated with a line
tion between a calling subscriber AB and a called sub
adapter IN2 directly connected to the banks of group se
scriber AB', a line selector L is provided to hunt for call
lector G and consisting of two sections n/s and a. 'I‘he
ing subscriber AB and connect him to a register connec
role of section a is to send to circuit CD and receive from
tor IE. The latter is thereupon connected to a register
EN the function of which is to receive the digits dialed by 20 said circuit the various signals required for the routing
of the call (seizure, invitation to send, etc.). Its make-up
the calling subscriber and send the selective combinations
depends essentially upon the type of circuit CD. Section
required for the routing of the various selection stages.
Two selectors have been provided, one a group selector
n/s is a modifiable section that can, as required, perform
supply or signaling functions. In the example described,
G, which selects a free line in the group corresponding
to the number dialed, and the other line selector L', 25 the calling subscriber is one that must be supplied. For
this purpose, register EN sends adapter IN2 a signal that
which selects called subscriber AB’ within his own group.
brings about in section n/s all the changes required for
To supply both subscribers, a circuit ALI, consisting of
said section to supply calling subscriber AB.
two sections s and n/s, is provided between group selector
f Finally, the exchange under consideration can also han
Gand line selector L'. Section s is a fixed supply bridge
designed to supply called subscriber AB’. Section n/s is 30 dle transit calls received over terminating circuit CA and
routed over originating circuit CD. In this case, register
a modiñable bridge that can perform signaling or supply
EN' sends adapter IN2 a signal that brings about in sec
functions as required. In the example described, the call
tion n/s all the changes required to adapt this section to
ing subscriber is one that must be supplied. For this
section n of adapter IN1. More precisely, section n/s,
purpose, register EN sends feeder circuit ALl a special
signal that brings about in section n/s all the changes re 35 which for an outgoing call supplies calling subscriber AB,
in the case here under consideration detects the various
quired to have that section supply calling subscriber AB.
phases of t‘ne routing of the call by means of signals sent
The holding of the talking connection is thereupon pro
it by section a and sends the corresponding signals to sec
» vided by feeder circuit ALL At the end of the call, the
tion n of adapter I N1.
replacement of the handset by the calling and called sub
scribers is detected by section n/s and section s, respec 40 Terminating and originating circuits SA and SD are
similar to circuits CA and CD but terminate at small-ca
tively, feeder circuit ALî then causing the release of the
pacity exchanges. They are connected on the banks of
various devices seized. In accordance with a known
line selectors L’ like local subscribers AB and AB’ and
method, this release can occur when the calling or the
are respectively associated with line adapters INS and
called subscriber hangs up, when the first of them does
45 IN4. Adapter INS consists of two sections a and n sim
so or, finally, when both have replaced their handset.
ilar to those of adapter I N1. Adapter I N4 consists of two
To route calls coming from a distant exchange located
ahead of the particular exchange involved, each terminat
sections n/s and a similar to those of adapter IN2. rIhe
ing circuit CA is associated with a line adaptor IN1 con
method of establishing connections through circuits SA
sisting of two sections a and n.
and SD is similar to the one already described for circuits
The role of section a
is to receive and send all the signals required for the rout 50 CA and CD. However, since adapter IN4 is connected
to the banks of line selector L’ »instead of to the banks of
ing of the call. Generally it receives a seizure signal com
group selector G, special arrangements must be provided
ing from the distant exchange and sends said exchange
to prevent both signaling and supply bridge ALI and
an invitation-to-send signal when register EN is ready to
adapter IN4 from being vconnected in series to the same
receive the dialing pulses. It then sends said dialing
talking connection, so as to prevent undue attenuation of
pulses to register EN, which in turn sends the selective
the connection. To this end, the register sends feeder
combinations required to route group selector G and line
ALI a special signal that causes` the establishment of a
selector L’ to called subscriber AB'. When the selection
metallic connection LM between the input and the output
of said subscriber has ended, section a of line adapter
of said feeder.
IN1 sends to the exchange ahead signals characterizing
FIG. 2 explicitly `shows the various terminating and
the availability of the called subscriber, his answer and 60
originating circuits terminating at the exchange under con
ñnally his replacement of the handset; it also sends a sig
sideration and it also shows the position as well as the
nal showing said subscriber to be busy if such is required.
nature of the bridges most commonly found in an ex
Circuit CA can operate in accordance with very different
methods. Thus, for example, the sending of the signals
change having one group-selecting stage. At the calling
required for the routing of a call can be done on D.C., on
commercial-frequency A.C., on VF A.C., or any other
end are local subscribers AB, circuits SA coming from
satellites as well as the corresponding adapter IN3, cir
cuits CAI coming from local exchanges, automatic cir
cuits CAZ as Well as the corresponding adapter IN1, toll
operator positions POA as well as the corresponding
adapter INS, and test positions PEA. These various
way. The number and the type of signals exchanged can
also vary within broad limits. Thus, for example, some
circuits send end-of-dialing signals, while others do not.
From the foregoing explanations it follows that the make
up of section a of adapter IN1 depends essentially upon
the type of circuit CA.
Section n ’of adapter INI is designed to receive from
circuits, along with the operator positions, are connected,
as required, either to the banks of’line selectors L or to
the. inlets Vvof group selectors G. At the called end are
local subbscribers AB',- circuits SD terminating atsatel
battery feeder ALI the various signals required for the
’
routing of the call (subscriber free, subscriber busy, an 75 lites as well as the cor s o dina'adV
3,059,055
5
C151 to local exchanges as well as the corresponding
adapter INS, automatic circuits CD2 as well as the corre
sponding adapter IN2, toll operator positions PO‘R` as
for calls from a local subscriber AB intended for the ex
change serving him. It comprises one section s for
supplying the calling subscriber and one section a for the
exchange of the signals required to route the call.
The operation of the circuit components that allow the
exchange of signals between the originating and the ter
positions, are connected, as required, either to the banks
minating adapter of the central oñice involved will now
of line selectors L’ or to the banks of group selectors G.
Finally, feeders ALl are provided between selectors G
be described, with reference to FIG. 6. Throughout what
follows it will be assumed that modiiiable section n/s of
and L', with the possibility of establishing metallic con
nections LM.
lO adapter IN2 (FIG. l) has received from the register the
special signal allowing it to adapt itself to section n of
As examination of the figure will show, circuits CAl
terminating adapter IN1, that is, to operate in conjunc
coming from local exchanges are not associated with
tion With it. The right-hand portion of FIG. 6 corre
adapters. In fact, for a call coming from such an ex
change, only one supply bridge is provided and, depend
sponds to section n/s of adapter IN2 (FIG. 1), the left
ing upon the case, it can be ALI, IN4, INS, IN2 or IN6. 15 hand portion corresponding to section n of adapter IN1
The register, which, for the sake of simplifying the draw
(FIG. l).
In the descriptions that follow, the various relays are
ing, is not shown either in FIG. 2 or the rest, sends these
bridges the special signal that brings about in section n/s
referenced by groups of two or more letters, the iirst
letter being generally common to all the relays of the
all the changes required to supply the local exchange
located ahead. The various signals required for the rout 20 same equipment, the second letter or letters identifying
the relay within said equipment. The contacts associated
ing of the call (subscriber free, subscriber busy, etc.) ‘are
with the relays are designated by the same reference as
therefore sent either by supplying the line wires or by
the corresponding relay, followed by one of the digits 1
reversing or suppressing the supply. By thus providing
to 9. Thus, for example, reference AC1 designates the
arrangements so that a local exchange ahead of the ex
change involved will always be supplied, regardless of 25 first contact of relay Ac. All the relays are shown in un
operated position.
the condition of the called subscriber, there is a saving
The battery normally used to supply the various relays
of one adapter at the calling end.
has its positive pole grounded, chosen as reference poten
Of course, no adapter. is to be associated with test posi
tions PEA and PER, these positions being generally in
tial; however, a special supply battery is available, with
tended to establish metallic connections.
30 its negative pole grounded. Also, three ditferent poten
tials are available: a negative polarity (negative pole of
FIG. 3 covers the case of a larger exchange, comprising
the regular supply battery), the ground potential or refer
a supplementary group selector G2 between first group
ence potential and a positive polarity (positive pole of
selector G1 and line selector L’. Depending upon the
the special supply battery). In the description, these
case, feeder AL1 can be inserted either between group
potentials will be designated battery, ground and positive
selector G2 and line selector L' or between group selec
Well as the corresponding adapter I N6, and test positions
PER. 'I'hese various circuits, along with the operator
tors G1 and G2, as shown by a dotted line. Generally,
feeder ALI is and remains located in front of line selector
L’ if the second group selector G2. is not installed at the
beginning. If, on the contrary, the second group selector
G2 is installed upon the creation of the exchange and is
used particularly to handle tralîic to local subscribers, it
may be desirable to locate feeder AL in front of the
second group selector G2, but so doing offers no other
advantage than to reduce the number of these feeders.
As examination of the ligure will show, the various called
end circuits can be connected, depending upon the case,
battery, respectively.
During selection the various relays of FIG. 6 are
4assumed to 'be in normal position. When selection has
ended and if the called subscriber is free, front contact
Xel closes and the following circuit is completed: battery,
relay Xc, back Xfl, front Xel, back Xgl, midpoint of
self-induction coil X52, the two halves of said coil in
parallel, line wires a and b in parallel, self-induction coil
XSI, midpoint of this coil, rectifier XQl, windings in
series of relay Xa, ground.
Relay Xa pulls up but marginal relay Xc remains un
operated owing to the high resistance of the lower wind
of line selectors L'.
ing of relay Xa. Relay Xa acts then on section a of
adapter IN1 in order to control all the necessary opera
In the case of FIG. 4, allotted bridges are used for
tions that will end in the sending of the “subscriber free”
certain calls of a specific type. Feeder AL2 is used for
calls between two local subscribers. It comprises two 50 signal to the exchange ahead of the exchange involved'.
When the called subscriber answers, back contact Xfl
sections s respectively supplying the calling and the called
opens, thereby causing the release of relay Xa in terminat
subscriber. This same feeder can also be used for calls
to the banks of group selectors G1 or G2 or to the bank
from local exchanges, these exchanges always being sup
plied as already described. Feeder ALS is used for calls
from a local circuit, for example, intended' for a local
subscriber. It comprises one section n, adapted to the
one of the terminating adapters, and one section s to
mg adapter IN1. Said relay then controls the sending
of the “subscriber removes handset” signal to the distant
exchange.
When the called subscriber hangs up, back contact
Xfl closes again, thereby causing the re-energization of
relay Xa and the sending of the “subscriber hangs up”
supply the called subscriber. Adapters IN6 and IN’6, re
signal to the distant exchange.
spectively associated with operator positions POR and
POR', are themselves allotted. Adapter JN6 comprises 60 If'the party at the distant exchange is an operator, the
sending of nnging current to the called subscriber can be
one section s to supply a calling subscriber or a distant
local exchange. Adapter IN’6 comprises one section n
designed to operate in conjunction with the section n of
placed under that operator’s control. The ringing opera
tion is translated, in adapter IN1, into the reception of a
suitable signal finally causing the closing of front contact
a terminating adapter such as IN1 or IN2.
FIG. 5 covers the case of a small-capacity sub-exchange 65 Xil. The high-resistance lower winding of relay Xa is
wherein all the signaling and supply bridges are allotted.
Feeder AL2 is provided exclusively for calls between two
local subscribers and comprises two sections s supplying
said subscribers. Adapter .TNQ is used -for a call coming
from the exchange serving the calling subscriber and in
tended for a local subscriber. It comprises one section a
for. receiving and sending the various signals required
short circuited, thereby causing marginal relay Xc to
energize and to control by any suitable means the sending
of ringing current to the called subscriber.
At the end of the call the operator can, by performing
an operation that causes anew the sending of ringing
current, call back a subscriber that has just replaced his
handset. This operation is translated in adapter IN1 into
the reception of a signal that causes the closing of front
for the routing of the call and one section s for supply
contact Xz‘l, the following operations developing then as
ing the called subscriber. Finally, adapter IN1() is used 75 described in the preceding paragraph.
3,059,055
8
pleted: positive polarity, marginal relay Xd, front Xgl,
suitable means. When equipment A has received all the
selective combinations, contact A111 opens.
in accordance with a variant, contact Aul opens after
self~induction coil X52, line wires a and b in parallel, self
iuduction coil XSI, rectifier XQZ, windings in series of
the reception of one or more digits and does not close
again until equipment A has «been able to receive the suc
yWhen the called subscriber is’busy, contact Xgl shifts
to operative position and the following circuit is com
relay Xb, ground. Relay Xb energizes, but marginal relay
ceeding digits.
Xd remains unoperated owing to the high resistance of
the lower winding of relay Xb. Relay Xb then causes,
by any suitable means, the sending of the busy signal to
the distant exchange.
If the distant exchange’s calling operator desires to
listen in, a signal is sent to the exchange here under'con
When the register has sent equipment A all the selective
combinations required to route the call, it sends an end
sideration in order to cause, by any suitable means, the
closing of front Contact X111. As a result, the high-re-V
of-dialing signal, which is translated into the application
of positive battery to wire b for a short instant. The fol
lowing circuit is then completed: positive battery on wire
b, back Aíî, A113, Agli, rectifier VAQl, relay Ac, ground.
Relay Ac pulls up and energizes relay Af over back Agl,
front Ac4, back AìZ, ground.
'
>
Relay Af completes a holding circuit for itself over back
sistance lower winding of relay Xb is short circuited and 15
Ahi and front Afl; over its front AfZ it prepares the cir
marginal relay Xd energizes, thus bringing about all the
cuit of relay Ag; over its front Af3 it prepares the circuit
operations required to listen in on a busy subscriber.
of its opposition winding; iinally, it causes the sending
When the listening-in operation ends, contact X111 opens
of a predetermined polarity to the register over wire AFI,
and relay Xd releases.
Self-induction coils X81 and X82 are so chosen as to 20 front Af4, back Ag3 and wire c. This polarity depends
essentially upon the charging method: it is positive if the
allow D.C. signals to be exchanged correctlyV between
equipment must record the identity of both subscribers for
adapters IN1 and IN2 without appreciable attenuation of
the purpose of printing a ticket; it is negative if the equip
the speaking current.
ment must simply receive from the register the signal of
FIG. 7 shows the supply bridges of feeder AL1 of FIG.
l. At the called end, the two line-wires a and b are sup~ 25 the charge applied and thereupon send the charge pulses
to the calling subscriber’s meter; finally, no polarity is
plied through relay Yd. At the calling end, the two line
sent if the charge applied is special (no metering, simple
‘wires zz and b can be either looped through self-induction
metering or invariable metering).
coil X83 or supplied through a relay Ya; the special sig
At the end of the end-of-dialing signal sent by the regis
nal coming from the register acts upon contacts Ycl and
Yc2 in order to cause the necessary switchings, depend 30 ter over wire b, relay Ac releases and completes the fol
lowing circuit over ACS: battery, relay Ag, back ACS,
ing upon whether the caller is a subscriber or a circuit.
A tap at the midpoint of self-induction coil X83 terminates
at relays similar to relays Xe and Xd of FIG. 6 in order
to allow the exchange of signals between the feeder in
front AÍZ, Afl, back A12, ground. Relay Ag energizes.
Relay Ag completes a holding circuit for itself over
AgZ; over its front contact Agi it prepares the circuit of
volved and the adapter associated with the calling circuit. 35 the opposition winding of relay Af.
The register tests an available auxiliary-trunk circuit
If the calling party is a local subscriber and the called
CLA over wire a, back A114, front AgS and back Ak3.
subscriber has answered, relay Yd energizes and over its
If this test is successful, it applies a ground to wire c,
contacts Ydl and YdZ causes the reversal of the calling
thereby energizing relay Al over front Ag3, back AkZ
end supply polarities. Condensers Ycl and YCZ split the
two supply bridges, while allowing the passage of the 40 and back All. Relay Al energizes and holds |by any
suitable means; over its front A11 it returns wire cto the
speaking current.
FTG. 8 shows a variant of FIG. 7 wherein the two sup
ply bridges are split -by a transformer TR. This bridge is
to be used when ground-potential differences or disturb
auxiliary-truck circuit.
„Auxiliary-trunk circuit CLA thereupon causes the
seizure of a free multipling circuit or trunk-bundle FC.
ances are likely to occur and when poor lines are involved,
As indicated by the multipling arrows, auxiliary-trunk
in order to reduce troublesome noises. SuchVv will be the
circuit CLA is common to a certain number of equipments
will now be described, with reference to FIG. 9. This
bridge, referenced A, can be used in the section n/s of an
polarity or a- combination of alternating currents of dif
A; also, multipling circuit or trunk bundle FC is common
case for small exchanges, at least for incoming or out
to a certain number of auxiliary-trunk circuits CLA. The
going calls. ln other cases, preference will be given to
`seized fmultipling circuit or trunk bundle FC thereupon
the use ofthe supply bridge of ì-TIG. 7, because of its lower
50 sends the register an identity signal over auxiliary-trunk
cost and because it produces less attenuation.
circuit CLA, front All, baci; AkZ, front Ag3 and wire c.
n The detailed operation of the block diagram of a sig
This identity signal may, for example, be a predetermined
naling and supply bridge in accordance with the invention
originating feeder or adapter.
ferent frequencies. Upon receiving this signal, register
In this equipment, only 55 EN is connected to trunk bundle FC by any suitable
the circuit components that are needed in order to be able
to understand the invention are shown. All the relays are
means. Said bundle consists essentially of a certain num
ber of wires and allows sending a plurality of selective
signals from the register to equipment A in practically
normally in home position.
instantaneous fashion. If the so-called “two-out-of-íive”
Equipment A is seized by means of circuits not shown.
The seizure signal (if needed) to the exchange behind is 60 code is used, and hence live wires per signal, a trunk
Ibundle comprising 5 x n wires will allow sending n sig
4under the control of the register, which applies a certain
nals simultaneously.
polarity to incoming wire c. This polarity is sent through
Over its front contact A12, relay Al causes the applica
back contacts AgS and Af4 to a relay not shown and
tion of battery to wire b, over the following circuit: resist
causes the sending of the desired seizure signal.
ance ARI, front A12, back Akl, front Agli, back A113,
When equipment A is ready to receive the selective 65 Ail and wire b. Upon receiving this battery, the register
combinations, contact Anl. closes and the two incoming
sends all the signals required for charging the call. These
line-wires a and b are looped through the following cir
signals are sent through trunk bundle FC and auxiliary
cuit: wire a, back A114, AgS, Acl, front A111, relay At
trunk circuit CLA; they are thereupon recorded in equip
(which remains unoperated), back Ag4, A113, Ail, wire 70 ment A by relays not shown since they do not form part
b. Register EN then sends the equipment the various se
of the invention.
"
lective combinations required for the routing of the call.
When the information required for charging the call has
been recorded in equipment A, relay Ak energizes by any
Each dialingY pulse is received in the form of a supply from
suitable means; at Akl it removes the battery from wire b
wires a and b, causing the energization of relay At, the
pulse being thereupon sent from the rearward end by any 75 in order to signal the register thatV the information sent has
3,059,055
9
10
been properly received, the register then releasing trunk
Ail, self-induction coil XSZ, front Aj2, Ahâ, back Ail,
bundle FC and auxiliary-trunk circuit CLA; over its front
AkZ, it prepares the operation of the two relays Am and
An; over its front Ak3 it prepares the circuit of relays Aj
wire b.
and Ac; it also opens the holding circuit (not shown) of
relay Al.
Where equipment A must record the identity of both
subscribers for ticket-printing purposes, the capacity of
the trunk bundle may be insuíñcient to send all the neces
sary signals simultaneously. After having transmitted
part of the information, this bundle is released and then
reseized for sending the rest of the information. To ob
tain this result, relay Ak is released by any suitable means
after the release of the trunk bundle; equipment A is then
The exchange of signals between the equipment A in
volved and the adapter IN1 of FIG. 1 is then effected as
said in the description of FIG. 6. When the selection has
been completed and if the called subscriber is free, con
tact Adl closes, the battery `of relay As being then applied
to the midpoint of self-induction coil XSZ and thence to
line wires a and b in parallel. When the called subscriber
answers, contact Arl opens and battery is removed from
line lwires a and b. When the called subscriber hangs
up, contact A111 closes again; the battery of relay As
is then applied again in parallel to the line wires. Finally,
if there is called-subscriber call-back, the terminating
in the same position as before the seizure of the trunk
adapter IN1 of FIG. l causes the application of ground
bundle and the above-described cycle of operations is
to line wires a and b through «a low resistance, thus caus
repeated.
ing the energization of marginal relay As, which controls
It will ñrst be assumed, throughout what -follows, that
equipment A must supply line wires a and b at the call
ing end. In that case, the register applies positive battery
momentarily to wire a, the following circuit being com
pleted: wire a, back Ah4, front AgS, Ak3, Ag6, rectiiìer
AQl, relay Ac, which energizes, ground. Over its front
A04 and front Agl and Afâ, relay Ac completes the circuit
of the opposition winding of relay Af. The ñ'uxes pro
duced by the two windings of relay Af being equal and
of opposite direction, relay Af releases. Over its front
the call-back by any suitable means.
The case will now be discussed where a metallic con
nection must be established between the incoming and
outgoing line-wires a and b of equipment A. As stated
in the description of `FIG. l, line selector L' is directed
to an adapter IN4 associated with circuit SD in the case of
a call intended for a satellite and feeder ALI must be
25 eliminated.
Before sending the selective combinations to
the satellite, the register momentarily applies a positive
polarity to wire b, as well as a negative polarity to wire
AC3 and front Ak2 `and Ag3, relay AC connects wire c to
a. The following circuit is completed: positive battery
the two relays Am and An, thereby allowing the sending
on wire b, back Ail, A113, Ag4, rectilier AQl, relay Ac,
of certain special orders from the register to equipment A. 30 battery. Relay Ac energizes and causes the energization
of relay Af, as stated in the description of the general
Thus, for example, if the call is intended -for the second
case; moreover, it completes the following circuit over its
subscriber on a party liner, the register applies battery to
front AC1: negative battery on wire a, back Ah4„AgS,
wire c, thereby energizing relay Am through rectifier AQ2.
front AC1, relay Az', which energizes, ground.
Relay Am then causes, over the ringing-current sending
Through the opening of its back Ail, relay Ai prepares
circuit, all the changes required to reach such second sub
the isolation of line wire b, which becomes effective after
scriber.
the release of relay Ac and the opening of front Ac2; at
Relay Af prepares, over its back contact Af2, the cir
AiZ it opens the circuit of relay Af and prevents the sub
cuit of relay All.
sequent operation of relays Ag and Ah. When the metal
When the positive-battery pulse over wire a ends, relay
Ac releases and over ACS completes the following circuit: 40 lic-connection signal (positive battery on wire bl and nega
tive on wire a) is suppressed, relay Ac releases but relay
battery, relay Ah, back AfZ, ACS, front Ag2, back Ai2,
Az' holds Vby any suitable means. Metallic continuity is
ground.
established across equipment A through line wires a and
Relay Ah energizes; over Ah2 it completes a holding
b; any shunt is eliminated through the opening of back
circuit for itself; over its front Ah3 and Ah4 it supplies the
two line-wires over the following circuit: battery, upper 45 Ail and AgS. Equipment A ceases to perform any func
tion; the rest of the dialing pulses, as well as any subse
u inding of relay Av, back Ajl, front Ah4, wire a, wire b,
quent orders, are transmitted directly from the register to
back Ail, front Ahî», back Aj2., lower winding of relay
Av, ground. Relay Av energizes over the calling sub
scriber’s loop.
the originating adapter JN4 of FIG. l.
l
At the end of the call, the release is effected by any,
Once the connection has been established between the 50 suitable means. It is possible, for example, to provider
a generaleholding relay whose return to normal is con
two subscribers, a predetermined number of charging
trolled by one of the two adapters IN1 or JN4 of FIG. 1,
pulses, dependent upon the tariñ” recorded, can be sent
said relay upon releasing causing the return to normal of
over contact Apl to the calling subscriber’s meter over the
all the other relays.
following circuit: battery, resistance ARZ, front Apl,
This possibility of eliminating the signaling bridge can
55
back AC3, front Ak2, AgS and wire c.
be used to take care of exceptional cases, for it allows the
When the calling subscriber hangs up, relay Av releases.
use of some other bridge or termination meeting the spe
Equipment A releases by any suitable means. It iS
cial requirements of such exceptional cases.
possible, for example, to provide a general-holding relay
The applications of the FIG. 9 block diagram to differ
(not shown) controlled by the hanging up of the calling
subscriber or the called subscriber or both and the re
lease of which -will cause the release of all the relays still
60 ent types of connectors or feeders will now be described,
with reference to FIGS. 10 to 14.
Of course, in each
in operated position, that is, relays Ag, Ah, Ak, Am (and
of these applications, generally only part of the previously
Av if the calling subscriber has not hung up as yet).
described arrangements will be used.
FIG. l0 shows the circuit components of an originat
The case will now be discussed, with reference to FIG.
l, where equipment A must operate in conjunction with 65 ing adapter between exchanges of the type receiving the
selective combinations in the form of multifrequency
signals.
for charging the call has been properly received by equip
When adapter B is available, all its relays are in nor
ment A, the register momentarily applies negative battery
mal position; wire t is then connected to battery through
to wire a, the following circuit being then completed:
negative battery on wire a, back Ah4, front AgS, Ak3, 70 back contact Be7 and resistance BRI; wire m is ground
ed through back contact Be6.
relays Aj' and Ac in series, ground. vRelay Ac causes the
Adapter B is seized by applying ground to wire t and
same operations as in the preceding case, namely, the re
battery to wire b, thereby causing the energization of
lease of relay Af and the energization of relay Ah. Over
relay Be. Over Bel, relay Be completes a holding cir
its front Ajl, and AJ'Z, relay Aj loops the two line-wires
section n of adapter IN1. When the information required
a and b over the following circuit: wire a, front A114, 75 cuit for itself; over its front contacts BeZ and Be4 it
Документ
Категория
Без категории
Просмотров
0
Размер файла
2 245 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа