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Патент USA US2276489

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March 17, 1942.
Filed June 13, 1940
5 Sheets-Sheet 2
Konsrnurm sermone-R
March'17, 1942-s
5 sheets-sheet> 5
Filed June l5, 1940
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[email protected]
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[email protected]
[email protected]
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[email protected]
[email protected]
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March 17, 1942.
Filed June 13, 1940
5 Sheets-Sheet 4
March 17, 1942.
Filed June 13, 1940
5 Sheets-Shee’rI 5
Patented Mar. 17, 1942
Reinhold Hoefert, Berlin-Gatow, and Konstantin
Schröder, Berlin-Staaken, Germany, assignors
to Fides Gesellschaft für die Verwaltung und
Verwertung von gewerblichen Schutzrechten>
mit beschränkter Haftung, Berlin, Germany, a
corporation of Germany
Application June 13, 1940, Serial No. 340,294
>In Germany May 16, 1939
4 claims. (ci. 17e-1s)
The present invention relates to improve
ments in >telephone systems and more particu
larly to a circuit arrangement for multi-ex
change telephone systems the exchanges of
which are interconnected in dilîerent ways.
Thus a call can be set up over the various junc
peater is not at the sole disposal of any one con
necting device in the exchange in question but .is
provided in common for several connecting de
vices, it must determine by which of these con
necting devices it has been seized in order that
the selected free line should be connected With
tion lines provided or over dilîerent exchange
that connecting device seized by the correspond
ing calling subscriber.
The latter is, for example, the case
if as Well as junction lines between the toll ex
To this end it has been proposed to mark the
changes or between the rural main exchanges 10 toll exchange or partof the toll exchange marked
and the associated toll exchanges so-called tie
by the calling subscriber’s initial numerical se
lines are provided between rural main exchanges
lection in the code vrepeater by means of a relay
and other exchanges of the same or of another
and to determine the connecting .means used
toll area over which traffic may be developed. - thereby by by-path testing in dependence on the
The required exchange station can then be 15 access seized by the code repeater. Since the
reached from the rural main exchange for ex
code repeater is adapted for common use by Sev
ample over the junction lines leading to the toll
eral connecting devices, hunting has very often
exchange erover tie lines.
to be carried out by several code repeaters simul
In order to maintain the junction lines to the
taneously and precautions must be taken to pre
toll area exchange free, especially if traine to dis 20 vent cross-connections in the b-y-path testing.
tant exchanges is concerned, in the event of con
This is attained` therein that a step-by-stepv
nections which may be made over tie lines pre
cautions are taken that the seizing of a high
valued junction line is only possible if no tie
line is available for building up the required con
nection. For this purpose code repeaters are
provided at the connectingmeans available to
the calling subscriber which receive the numer
switch mechanism closes the test circuits for the
individual code repeaters one after the other so
that at one time one testing operation only can'
take place. This switch mechanism can, hoW
ever, only operate with a, limited speed since the
selector of the code repeater determining the
seized connecting device must traverse a large
number of contacts during each operation of the
ical impulse series transmitted for marking the
required direction and determine according to 30 switch device.
the said signals whether tie lines 'are available
According to the following invention the de
in the required direction in order that, if nec
termination of the toll area selected by the call
essary, a free line of this kind should be switched
ing subscriber and the connecting means seized
to the connecting devi-ce seized by the calling
for this purpose is simplified and false operation
subscriber. According to Whether this line leads 35 is prevented. rThis is attained therein that
directly to the required exchange station or at
switch devices are associated with the code re
ñrst to another exchange station over Which the
peaters, to the contacts of Which are connected
required connection can then be set up, a certain
the connecting devices used by the code repeater
number of the stored numerical impulse series
in groups according to their traino directions and
are sent out from the code repeater. I1" it is de
also singly so that by the setting of the switch
sired to prevent the code repeater being taken
device simultaneously the >signal selection and
into use when connections are set up within the
setting up of the connecting path to be repro
rural main exchange connecting means must
duced by the code repeater according to the di- ,
be provided the seizing of which is only under
rection of the seized connecting device is deter
taken after the selection of one or more numeri 45 mined-and the connecting device connected With
cal impulse series by the calling subscriber so
the selected connecting path is also determined.
that the code repeater must determine the nu
An embodiment of the invention is Aillustrated
merical impulse series sent out before its seizure
in Figs. 1-5. Fig. l isa schematic networky lay
in order to determine the path to »be used and,
out of a multi-exchange area With a number of
if necessary, to be able to transmit the impulses 50 connecting paths, While >in Figs. 2 and 3 a sec
according to the path which is chosen for the- tion of the rural main exchange (NHA'IZ) is
connection. The code repeater must, therefore
shown attainable by a calling subscriber over a
determine which toll exchange or which part of
connecting means Uel2 to-which a code repeater
the tollexchange has -already been marked by the
(e. g. KZ!) common to several connecting de
calling subscriber. Further, since the code re 55 vices may be connected over a connectionselec
2 _
necting lines (S, A, B, C) to the connecting
the further impulses transmitted from the ca1l~
ing subscriber consisting of three and five im
pulses by setting the wipers (12B-(122 and
tor (for example AW2).
The selectors (Ws,
Wa, Wb, Wc) are shown for connecting the con
In Figs. 4 and 5 a code repeater (e. g.
d3û-d3l; if necessary then a further impulse
KZI) is shown with the selectors necessary for
its diiîerent functions and the signal control
relay. Battery and earth are omitted where they
series is received by setting the wiper d_dël. By a
corresponding setting of the m20-m26,
m3|-m36, m40-m46, m50-m56, and 1160-1162.
are not necessary in order that the invention ybe «
the junction line available in the required direc
tion is determined, the chosen line is connected
with the connecting means Ue|2 seized by the
calling subscriber and, according to the line con~
nected, determines how many impulse series are
explained to simplyfy the drawings. The setting
magnets for the selector with the associated re
vertive relay are not shown in order to explain
more simply the operation in question. The con
tact banks of each signal selector are shown
to be sent out from the code repeater KZI,
schematically in order to keep the circumference
determined by the setting of the wiper d50, for
of the selector within a reasonable space; and
reaching the required junction centre KA|35.
a limited number of wipers are shown in the
The switch operations described above take
given embodiment. For the selectors in Figs. 4
place in detail in the following manner:
and 5 with the reference “d” step-by-step selec
After the group selector GW in the rural main
tors are used and for those with the reference
exchange NHA'I2 (Figs. 2 and 3) is set by the
“m” motor selectors are used; naturally other 20 numeral 1 on the decade l, it hunts for a free
types of selectors may be used.
connecting means. If, for example, a connecting
`.In Fig. 1, two toll area exchanges are shown,
means Ue|2 connected to the contact 2 is reached
BAI ,and BAT, to which rural main exchanges,
a circuit for the relay C is completed over the
for example NHA12,-13, 'M or NI-IA|2, I3, |`4 are
test conductor over the corresponding c-wiper
connected. To some of the rural main exchanges
which by connecting its high resistance winding
are 'connected junction centres, for example
II over the contact | c holds the connecting means
KA`|2|, 121|, or Iii-U33, |34, |35 from which iinal
locked against further seizing by another group
exchanges, e, g. EA'Z24I, 72132, 'l2-'i3 or EAI35I,
selector. The connecting selector AW2 asso
|352 branch off.
ciated with the connecting means Ue|2 is pre
The connecting means Ue|2 shown in Figs. 2
pared to be connected With a free code repeater
and 3 with the associated selectors Ws, Wa, Wb,
e. g. KZI and the relay T of the hunting switch
Wc, is like the code repeater KZI shown in Figs.
AW2 is energised over: earth, battery, Wz’S (Fig.
4 and 5, provided in the following example in
4), contact |3cl, conductor I, wiper a2 of the '
the rural main exchange NHA'IZ. From this ex
hunting switch AWZ (Fig. 2), Wz'3, contact 3t,
change are connected so-called S-lines to the as- “
sociated toll area exchange BA1, which is con
nected over junction lines with the toll area ex
change BAL Also between the rural main ex
change NHAIZ and the toll area exchange BA|
A-lines are connected, between the rural main 40
exchanges NI-IA12 and NI-IA|3 B-lines, and be
tween the rural exchange NHA'IZ and the juno»
tion centres KAI33, |34, |35 C-lines. Between
the other exchanges likewise different junction
Winding II of relay T, earth. After the closing
of the contact Scl, relay P (Fig. 2) and relay CI
(Fig_ 4) are energised over: earth, battery, Wil,
winding II of relay CI, contacts |502, IGsp, con~
ductor 2, wiper b2 of the hunting switch AW2,
windings II and I of the relay P, contacts 12T.
lla, 6c, earth. The relay P, when its high re« ‘
sistance winding I is short-circuited over con
tact lp, locks the code repeater KZI against
seizing by another hunting switch. By closing
lines can be connected in any preferred manner. 45 the Contact 8p the impulsing relay Al of the
The S-lines are lines which end at an S-group
code repeater KZI is connected over: Wiper c2
selector for .selecting a toll exchange. The
of the hunting switch AW2, conductor 3, relay
A-lînes end in an A-group selector which pro
Al, contact MCI, Wiß, battery, earth. By the
vides for the selection of a rural main exchange.
closing of the contact 9p the circuit over which
The B-lines lead to a B»group selector which 50 the code repeater KZ! transmits numerical im
provides for the selection of a junction centre
pulses is prepared over the wiper d2 of the hunt
while the C-lines lead to a C-group selector and
ing switch AWZ and the conductor 4.
are provided for the selection of a final exchange.A
In the code repeater KZI after relay Cl is
From the network layout shown in Fig. 1 it
energised the associated contacts are operated
will be seen that a calling subscriber belonging 55 so that relay C2 is energised, contact 2|c| closed
to the rural main exchange NHA'IZ may reach,
and relay CI is held energised over its series
for example, the junction centre KA|35 over the
Winding III. Further, after the code repeater
S-line to the toll area exchange BA1 and then
KZI is seized, the selector provided with Wipers
over BAI-NI-IAIS, or over A-line to the toll
mill-mV! is set in motion, in a manner not of
area exchange BA| and `then over NI-IA|3 or 60 interest in this invention, in order to determine
over B-line to the rural main exchange NHAI3,
the seized connecting means Uel2. The selector
or directly over the Celine. The marking num
is in motion until its wiper mlû reaches the con
ber for access to this junction centre is 135 and
ductor connected to the contact 2. Then the
the ñrst ñgure l serves for setting a group se
relay Pl is energised over: (Fig. 2), earth, bat
lector GW in the rural main exchange NHA'lZ
tery, Wz‘S, contacts 151', |2p, wiper f2, conductor
on the ñrst decade, in which a free connecting
|2 (Fig. 5), wiper mlû on contact 2, relay Pl,
means is hunted e. g. the connecting means Ue|2
contacts 2|q|, 22cl, earth. The relay PI is thus
connected to the contact 2. To this connecting
energised when the selector is stepped-on to
device (of Figs. 2 or 3) a free code repeater e. g.
the second contact; in a manner not shown here,
KZI is connected over a hunting switch AWZ. ’
further stepping by the selector is prevented.
Wiper mll set with the wiper mIU marks, in the
contact bank which it traverses, the connecting
This code repeater which is shown in detail in
Figs. 4 and 5 repeats the marking number already
received from the group selector GW (the num
ber 1)’ by setting the wipers dIIJ--dlS according
to setting of the wipers mIU-ml'|; it receives
means Ue|2 by being set on the second contact.
In this contact bank, however, contacts are mul
tipled according to the number of connecting
means required in the corresponding direction.
To simplify matters two connecting means are
providedin the direction I in the present ern
on the contact 3, the two selectors with the
wipers mim-m26 and m30-m36 are in motion ~
until the wipers m20 and [email protected] reach the contact
I 3. The relays P8 and P9 are energised over:
Cl wiper m29 or m39 on contact I3, multipling,
After the relay PI is energised, the relay QI
is energised over the contact 2311i and holds it
wiper d`2ll on Contact 3, contacts d2u2, 43415, and
self Íenergised in a holding circuit over its con
No2. The relay QQ is energised over the con
tacts M115, 435119,[email protected] and 47:12 and is held ener
gised over its contact Tlqd. II"he relay Q5 is rc
10 stored by the short-circuit over the contact
tact Zâlql. Moreover, depending on the control
relay, not shown, the selectors with the wipers
mGÜ-mêâ and mtg-_m56 are set in motion un
til the wipers mail and m50 reach the contacts
marked by the wiper ml I. When the wipers m40
and m50 are resting on the contacts I, the relays
P2 and P3 are energised over: relay P2, wiper
»fi-8c4. A further setting operation of the two
selectors is prevented.
In the Contact banks of the selectors which
are swept over by the wipers m2I-m26 and
m40 on contact I or relay P3, wiper m50 on con
m3I-m35 are contained all the possible con
tact I, wiper 'm'I I on contact 2, contact 2502.
Apart from the setting of these selectors, after
nections in the main and tie directions. The con
tacts which may be reached by these wipers are
relay QI is energised, in a manner not shown
multipled in a deñnite manner with the con
here, the selector with the wipers dill to £155, is
tacts attainable by the wipers mill-m46. Ac
cording to theabove description, for example, vthe
wipers m40-m46 corresponding to the groups of
stepped-on until the relay Pfl is energised over I
the wiper dll? and the contact marked by the
wiper ml I. This also takes place when the
switch has taken one step. The next numeral
the seized connecting means Uell are set on the
contact I while the wipers »12d-m26 and [email protected]
m36 are stepped corresponding to the first two
is thus determined. The multipling between the
steps of the wipers dit] and mII is-so selected 25 impulse series (l and 3) «and are set on the con
that the number to be transmitted is the ñrst
tact I 3.
place of the marking number and is also the
In the circuit given in Figure 3 it is assumed
number of steps which the selector with the
that for the direction characterised by the three
wipers cZIIl-dlâ is distant from its zero position.
impulse series (I, 3, 5) the following possible
rî‘he ñrst impulse series is subsequently routed 30 connections may obtain:
over the wiper dlr: set cn the contact i, and is
IC-direction according to the numerical selection 185
transmitted by the selector with the wiper (15d.
B-direction according to the numerical selection 13
After relay Pd is energised, the relay Q2 is
A-direction according to the numerical selection l
energised over the contact ìßpê, The impulsing
relay AI of the code repeater KZI receives the e S- direction according to the numerical selection l
further impulse series transmitted from the call
The corresponding contacts I3 are therefore
ing subscriber over the conductor 3. By the next
connected with the contact I of the contact bank
traversed by the wipers mtl to mdc in the man
impulse series the selector with the wipers
ner shown.
¿2li-0123 is set and, since the next impulse series
consists of three impulses, reaches the contact 3. 4.0' The multipling for the other directions is
Hereupon, in a manner which is not shown,
carried outy according to all the connections
switching over takes place so that the third im
pulse series (5) is transmitted from the relay AI
to the selector with the wipers (E38 and däl. If
necessary a 4th impulse series is subsequently
transmitted to the selector of the wiper ddl).
In the present case all three possible tie lines
(A, B, C) are determined by the first three irn
pulse series.
The relay Q2 energised over the contact 25nd
after relay P4 is energised during the determina
which are possible.
As shown in Figure l, three rural main ex
changes NHAIZ, NHAES and NEL/«lill may, for
example, be connected to `the toll area exchange
BAI. In this case then the contacts I2 to Id
in the contact bank traversed by the wiper mZI
are connected together and, since the toll area is
associated with the group I, one step is taken by
`the wipers míl‘ll to m65 wired to the ñrst contact
of the contact bank traversed by the wiper mill.
If other A-lines are provided, in the contact
bank traverse by the wiper m22 the contacts Y
I2 to Ill should be connected and multipled with
55 the ñrst contact of the contact bank'traversed
tion of the iirst numeral (l) connects the selec
tors in a manner which is not shown, with the
wipers 1MB-m26 and „Z39-_m33 in an auto
matic stepping circuit. They are stepped-on
until the wipers m2o and m38 reach that con
tact which is marked by the wiper dI I set on the
contact I. The test relays P8 and P9 of thesetwo selectors are now -energised and stop the
selector. The energising circuit is completed 60
by the wiper mil-2. This applies similarly for the
B and C lines.
~ As shown above the relay Qd is energised in
the present circuit after the wipers m20 to m26
and mSI to m36 are set. The wipers d‘àû to -dß2
over; relay P8, wiper m28 or relay PS, wiper
are stepped-on in any known manner.
[email protected] on contacts II, multipling wiper dl I on con
as contact 2 of the wiper dßll is reached the
relays PII) and PI I are energised in series over
tact I, contacts 35u2, 36u3, and MC2. After con
tacts Sêpß and 38229 are closed, relay U3 is ener
gised over: contacts 31o/5, 38179, 39138, llllq2. Re
As soon
contacts 52c2, 88N, 5IqfI, relay PIIB, wiper d50
on contact 2, wiper m45 on contact I, wiper m32
on Contact I3 U35), wiper d3l on contact 5, con
lay U3 breaks the circuit for the relays P8 and
P9 at 3Su3 so that the two selectors are again
tact SM2, relay PII. Over the contacts ß‘IrI,
switched in.
53pm, the relay PI2 is connected to the wiper «
In the meantime, by the closing of contact
dSI. Since the wiper dñl. is set at Contact 2 and
43o/5 a new test circuit is prepared over the wiper 70 the wiper m55 on the contact I (conductor oc)
dîil, for, after the second impulse series from
it can energise as long as a free C-line is avail
the calling subscriber setting this wiper the re
able over the conductor vc. In this case the
lay Q5 is energised over wiper (123.
relay PI2 is energised over: contacts S'Irl, 53pm,
Since in the above case this impulse series
relay PIZ, wiper cZGI on contact 2, wiper m55 on
consists of three impulses the wiper d2!! is set
’contact I, conductor> vc, contacts 54120, 55mc,
relay Bc, battery, earth. In this circuit relay Bc
is also energised and by closing its contact 565e
the rotary magnet Dc of the selector Wc is con
nected over the contact 5'Imc. This selector is
in motion until the relay Mc is energised over
earth, contacts 59120, 58bc, windings II and I of
the relay Mc, wiper dc, conductor dc (Fig. 5),
wiper mI6 on contact 2, wiper 1162 on contact 2,
ing c-conductor (vc, vb, va, vs) a corresponding
selector (Wc, Wb, Wa, Ws) is started. Over the
Wipers £162 and mI2 to mI'I the d-conductor
(dc, db, da, ds) is marked corresponding to the
connecting device on which the corresponding
selector must test.
As soon as Vthis occurs the
relays R and RI are energised as shown. The
test circuits for the relays PIII and PI2 are
broken at the contacts 81H and 88H. Moreover,
contact BûpIZ. In this case the connecting de
vice UeI2 seized by the group selector GW to 10 the transmission of the impulses by the code re
peater (KZI ) may begin. According to the path
which the free C-line is connected is connected
(C, B, A, S) over which a connection is to be
over the selector Wc. The relay Mc by opening
contact 5'Imc prevents further operation of the
rotary magnet Dc. Relay NC is connected to the
developed the marking number 135 is completely
or partly absorbed or completely transmitted.
If for example a C-line is seized the complete
wiper c of the selector Wc over contact Slmc so 15
marking number 135 is absorbed; only the 4th
number which sets the wiper 0140 is transmitted.
As described above the relay PII is energised
of the selector Wc, relay R, contact 181', wiper e2
after a C-line is determined; it holds itself ener
of the connecting selector AW2, conductor 5
(Fig. 4) winding I of the relay RI, contacts 20 gised further over the contact 89p| I. By clos
ing the contact 9IpI I, a contact is immediately
'I9pI2, 800|, earth. In this circuit the relays R
marked in the contact bank traversed by the
and RI are also energised. Conductor 5 is dis
wiper d50 which corresponds to the setting of
connected by the opening of the contact 18T.
the wiper dIIIJ sothat the wiper d50 can take up
The holding circuit for the relays Nc and R is
now extended over the contacts 13T, 'IIa and 5c, 25 this setting. When this is accomplished the relay
P'I is energised over: wiper d50, multipling,
while relay RI (Fig. 4) is connected in a hold
wiper 1140, contact Iûûul, relay Sp, contacts
ing circuit over its winding II and the contact
9IpII, 92pI2, 9302. Further switch operations
82H. By the closing of the contact 641m the
are described further on.
connecting device Ue|2 now connected to the
If, instead of a C-line, a free B-line is seized,
selector Wc is locked, while by the closing of the 30
relay PI3 is energised after this B-line is se
contacts 62nc and 631m the speaking conductors
lected and a holding circuit is completed over the
are switched through. By closing the contact
contact I43pl3. Over the contact IMpI3, con
65nc the relay Vc is energised so that the relay
tact 5 in the contact bank traversed by the wiper
Mc is also held energised over its winding III
and the contact 680e. When relay Vc is ener 35 d50 corresponding to the setting of the wiper
d3() (3rd dialling of the marking number) is
gised the seized C-line is disconnected from the
marked so that the wiper d50 takes up this set
conductor vc by the opening of the contact 54110
ting and thus, as will be explained later, can
and this conductor is switched on to the next free
transmit 5 impulses. In this case the numbers
C-line by the closing of the contact 100C. By
the closing of the contacts 83T and 84? the con 40 1 and 3 are absorbed.
If a free A-line is seized, instead of a B-line
ductors a2 and b2 in the connecting device UeI2
the relay PI4 is energised and a holding circuit
are switched through and by the closing of the
is completed over the contact I46pl4. Over the
contact 85H (Fig. 4) impulse transmission is
contact I4'Ipl4 the wiper 412| is connected so
started as will be explained later.
If a free C-line in the marked direction (135) 45 that its sett-ing (on Contact 3) is taken up by the
wiper S56. In this case only the number 1 of the
is not available the relay PI2 cannot be energised
marking number is absorbed.
over a corresponding inc-conductor; the wipers
If an S-line is seized, the wiper dI5 set on the
dIìI) to e162 are stepped-on until Contact 4 is
contact I is immediately connected since the con
reached. When relay PII) is energised the test
ing of the availability of a free B-line, corre 50 tacts I5Ic2 and I50pI2 are, as in the above cases,
closed. The wiper d50 thereupon takes up the
sponding with the testing (C-line) described
setting of this wiper dI5 and no numbers are
above, takes place over the conductor vb. If a
free vb conductor is available, the correspond-The actual stepping-on of the wiper d50 when
ing relay is operated as for the seizing of the
free C-line, the selector Wb is set on the con 55 taking up its position for the purpose of impulse
transmission takes place by the well-known a1
necting device UeI2 and the connecting path is
ternating reciprocal interaction of the relays I
switched through.
and K when the contact 85M is closed. The con
If also no B-line is free the wipers dßû to «162
tact I9i transmits the impulses over the conduc
are stepped-on until contact 5 is reached. When
relay PID is energised the relay PI2 tests over 60 tor 4 and the wiper d2 of the selector AW2 over
the connecting device UeI2 while another i-con
the conductor va. whether a free A-line is avail
that the relay is energised over: C-line, windings
II and I of the relay Nc, contact BImc, wiper c
able and if this is the case causes the selector Wa
to be set on the connecting device Uel2 in a man
tacàt operates the magnet, not shown, of the wiper
ner corresponding to that described above for
If it is assumed that an S-line is connected
d5 .
the C or B-lines.
65 with the connecting device Uel2 over the selector
Ws the whole marking number 135 is transmitted
If no free A-lines are available the wipers
as described above. The number 1 is marked
dëIl-CZBZ are stepped-on until they reach the
by the setting of the wiper dI5 on the contact I,
contact 6 over which the availability of an
the number 3 by the setting of the wiper dZI
S-line is tested. If a free S-line is available the
on the contact 3 and the number 5 by the setting
selector Ws is correspondingly set on the con
of the wiper (130 on the contact 5. Since now
necting device UeIZ over the conductor Us and is
set according to the conductor ds marked.
It is understood that over'the wipers dGI and
m5l the different groups of lines are tested to
see if they are free so that over the correspond 75
only the relay PI2 is energised and not the relays
PI I, PI3 and PI4 only the wiper dI5 is connected;
by being set on the contact I in the contact bank
traversed by the wiper d50 it marks the contact
Yl A'so'that after 'taking >one Vstep ‘the wiper vd50
connecte'd‘ipr‘ transmittin'gian impulse, is stopped
4since the‘relay `P1 is energise'd’and the relay I
The wiper d50
is thereupon returned toits resting position by an
interrupter (not shown). :Relay'iPl‘li is energised
‘ is disconnected `at >contact l51p1.
however, so vthat 'theV circuit. described is broken
at the'contact I51u3. The wipers m20-m261and
mSEl-mSö‘are operateduntil the contact ‘13 is
reached, since this Contact is marked by .the‘wiper
¿H2 set by the wiper all-3. Theirelays P8 and P9
are again energised. If, later, the numbers to
be sent out by the wiper 'd50 are determined the
over its"winding II in >serieswith the relay P1 so
'that `the wiper ‘dl'ä Ais disconnected at contact
first number ('1) is so formed that lthe relay P1
|‘53pl‘4 y‘and over `contact Iß’lpld the wiper d2l
is again energised after 7 steps by the Vswitch
is connected. In the meantime relay P1 restores 10 over: wiperA d50 on contact 1„ contacts 25175,
'so thatthe next impul’se‘transmi‘ssiontakes place
t’ßul, winding 1I of the relay PM, contacts l‘53pl`4,
with vthe vwiper d5û'again being stepped-on from
its*- rest position. According -to the setting of the
wiper d2! on contact 3, three impulses are trans
mitted since therelay `P1 isenergised after wiper
` (15B is set ‘on Contact 3 over: wiper d5!)> on con
tact 3, wiper `dil on contact 3, contact 32rd,
winding .II'of the ‘relay`Pl3, contacts ld1pli,
lêBpIB, M'Bpl l, 1501012, |5102. The relay PI3 is
energised in this >circuit in series with the relay
P1 and >disconnects the wiper cl2-I and connects
the wiper dSû. The wiper dell is, in the mean
relay‘P‘lâ is also energised yand completes a hold
ing'circuit for itself over Contact ldûpld. When
the wiper d50 is operatedasecond time'therelay
P1 is then energised in `series with the relay PI3
over: the wiper >dei) on contact 3, wiper dl5,
contact L3mi, winding II `of vthe relay PI3, vcon
tacts I‘Al’lpl-G, IltßplS, MSNM, |’5lìp|2,~l5lc2. Thus
three impulses are transmitted, the two numbers
already transmitted by the calling'subscri'ber be
time, again restored to its rest position. By the
third impulse train which is transmitted, as be
fore the code repeater was seized are reproduced
and are transmitted by the'code repeater over
an S-line. When using other lines the vappro
fore, over’the contact 192" the wiper d50 is stepped -
priate impulse series' are suppressed.
for Athe third time until'the contact 5 marked
Corresponding >operations occur if “a Service'
by the wiper d3û is reached. The relay P1 is
call is to be made, for marking which, for ex
now energised in series with the relay PII over:
ample, the numbers 04 are dialled. In this case
wiper 015D on Contact 5, wiper 1138 on contact 5,
the relay P6 is operated over the wiper dll! the
contact l45ul, winding II of the relay PII, con 30 --relays UI, U2 and Q2 arel energised. The Wipers
tacts l44p|3, 90ml, 921212, 93c2. The wiper 013i)
m20 to m26 and m30 to m36 are first set on the
is disconnected and the wiper dell is connected.
contact 01 and then contact 04. When the first
The 4th impulse series is then undertaken by a
number is transmitted the relay P1 is energised
further operation of the wiper d50 according to
over the Contact 354395 in series with the relay PM
the setting of the wiper d40. When the corre- I while the next numberis transmitted in manner `
spending contact is reached the relay P1 is ener
corresponding to that previously described.
gised in series with the relay Sp. The contacts
When using other lines a part of the impulse
lßsp and lßlsp give rise to the disconnection of
transmission is suppressed.
the code repeater KZI. In the connecting device
It should be noticed that for transmitting al1
Ue|2 relay P is de-energised, (Fig. 2) and the ~ the numbers of the marked number by means of
a-conductor is switched through to the conductor
the wiper d50 if two numbers are to be repro
a2 over the contact Nlp; the calling subscriber
duced afterwards, the ñrst number is transmitted
receives a signal from the exchange and dials
according to the direct marking over the contacts
the additional numbers required for reaching the
25105 or 36126 the second number according to the
required subscriber.
settingr of the wiper dl5, the third according to
The switch operations described above occur if,
the setting of wiper`d2! and so on, while for re
before the code repeater KZi is seized, a’single
producing a number all numbers of the marking
number (l) of the marking number (135) is sent
number are transmitted by the aid of the wiper
out. If, for example, for setting up a connection
d5!) so that the wiper dl5 determines the first
within the same toll area (BA1) two numbers
number, d2! the second, dâíl the third and so on.
have already been selected-cf. Fig. 1, in which
We claim:
for reaching the main network 13 before a con
l. In a telephone system, a multi-exchange
necting device is seized the selectors GW and
network, two groups of connecting devices in one
GW1 are already set-the direction to be used
of said exchanges, numerical switching apparatus
is only developed by the use of a code repeater if
in said one exchange operable to select either of
the second number marks a different rural main
said groups of devices at will and effective there
exchange such as is the case, if in the present
upon to seize one of` the devices in the selected
instance the number 73 is selected. These num
group, a code repeater common to all of said de
bers selected before the code repeater is seized
vices and having a plurality of contacts each cor
have to be reproduced subsequently. For this 60 responding to a diiîerent one of said devices,
purpose a wiper d|3 is provided together with
means operated upon the seizure of said device by
a relay P5. The contact bank traversed by the
said apparatus to mark the one of said contacts
wiper d|3 is so multipled with the contact bank
corresponding to the seized device, means in said
traversed by the wiper mil that the relay P5 is
repeater controlled by the marked contact for
energised after the wiper has taken the number
determining the one of said devices seized and,
of steps which correspond to the second number
at the same time, registering a code depending
(3) which is to be reproduced. The relay P5
upon the one of said groups selected, other means
switches in the relays UI, U2 over its contact
in said repeater operated variably to register a
21105 whereupon the relay Q2 is energised over
code indicative of any other exchange in said net
the contact 28u2, The wipers m20 to m26 and
work, a direct and an indirect route over which
mäû to m35, stepped-on after relay P5 is ener
connections may be established between said one
gised, stop when contact 1I is reached since then
exchange and said other exchange, both of said
the relays P8 and P9 are momentarily energised
routes accessible to the seized connecting device,v
over: wiper m25) or m30, contacts 1I, I 59135,
said repeater controlled by said registered codes
I5Bu2, |51u3, l56c2. The relay U3 is energised,
to select one of said routes and to control the ex
tension of a connection thereover from the seized
connecting device to said other exchange.
2. In a telephone system, a multi-exchange
network having alternative routes for setting up
connections between exchanges, a repeater in a
local one of said exchanges for controlling the
extension of connections to the distant exchanges
in said network, two groups of connecting devices
in said local exchange, means operated to seize
3. A- telephone system as claimed in claim 2,
wherein said registration of the identity of the
group to which said seized device belongs con
trols the selection, by said repeater, of the route
over which said connection to the desired ex
change shall be extended.
4. In a telephone system, wherein connections
are set up by automatic equipment under control
of the digits of the called station’s number, two
a device in one of said groups when it is desired 10 connecting devices, means for seizing one of said
devices at times responsive to the receipt of a
to extend a connection to certain of said distant
certain order of digit of the called station’s num
exchanges and to seize a device in the other of
ber and for seizing the other of said devices at
said groups when it is desired to extend a con
times responsive to the receipt of a different order
nection to other distant exchanges, means re
of digit of the called station’s number, a con
sponsive to the seizure of any of said devices for
troller common to said devices, means for seizing
identifying the seized device in said repeater and,
said controller responsive to the seizure of either
at the same time, registering therein the identity
of said devices and for automatically register
of the group to which the seized deviceY belongs,
ing therein the digit which caused that device to
other means in said repeater operated to register
the identity of the exchange to which it is de- . be seized, said controller thereafter eiîective to
control said automatic equipment in accordance
sired to extend a connection, said repeater eiîec
with said registered digit to extend a connection
tive to select a route over which to extend the
connection to said desired exchange and at times,
from the seized device.
in dependence upon the route selected, to repeat
al1 or part of said registered information to con- .
trol switching apparatus to set up the connection
over the selected route.
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