DE1018476B - Circuit arrangement for telecommunications systems, in particular telephone private branch exchanges, for transmitting different characteristics over a two-wire line - Google Patents

Description

GERMAN

The invention relates to a circuit arrangement for subscriber stations with two-wire connecting lines and manually operable switching devices, one of which is used to carry out control operations applies the same potential to both wires and the same to the other to carry out other control processes Potential only applies to one wire and the other at the same time disconnects, for telephone systems with switching and subscribers who are not authorized to intrude.

In a known system of this type, when one of the switching devices is actuated, which is connected to both Leads to the same potential, a query initiation and cancellation causes, while when actuated the other switching device through which the same potential is only applied to one wire and the other Wire is disconnected, an intrusion is triggered in the inquiry state.

In telecommunications systems, in particular private branch exchanges, it is sometimes necessary, except for the described switching indicator another from the subscriber station to carry out another Transferring the switching process.

A known arrangement uses a special one from the subscriber station of the exchange for this purpose running signal wire to trigger a signal at the operator console that the operator causes to contact the participant.

To, without going through the usual control procedures,. such as initiation and cancellation of inquiries, as well as activation to do without a busy subscriber, another switching process via the two-wire connection line, z. B. signaling at the attendant console, but without one from the subscriber station to the operator It has already been proposed to use running signal wires and the special button at the intercom station, that when one of the switching devices is actuated, it applies a potential to one wire and the other wire at the same time separates the feeder bridges after a previous election and the selected subscriber was busy of the respectively occupied connection sets bring switching means into effect, which a connection to cause the subscriber line found to be busy, but when the same switching device is actuated in any other connection state can be actuated by the same switching means of the respectively occupied connection device switching means that send a signal switch on at the attendant console.

In telephone systems, in particular telephone branch exchange systems, the few subscribers who are authorized to connect are probably also authorized to switch on a signal in the exchange. However, not all subscribers who are able to switch on a signal at the operator console should be authorized to switch on.
The invention addresses this problem and circuitry
for telecommunications systems, in particular

PBX systems,

for the transmission of different

Identification via a two-core cable

Applicant:

Standard Elektrik Aktiengesellschaft,
Stuttgart-Zuffenhausen,
Hellmuth-Hirth-Str. 42

Alfred Heyduck, Stuttgart-Zuffenhausen,
has been named as the inventor

shows an arrangement in which by the same switching means depending on the authorization of the subscriber a Activation or activation of a signal can be triggered in the exchange. This is achieved by that the connection records when they are occupied by an authorized subscriber, by the Calling and disconnecting relay controlled, a certain identifier is transmitted, which causes that when actuated one switching device that applies a potential to one wire and at the same time disconnects the other wire, after previous dialing and the selected subscriber being busy by influencing the feeder bridges of the respectively occupied connection sets switching means are switched on, which are connected to the make occupied subscriber line found, and that when actuating the same switching device in the same Connection phase by a subscriber who is not authorized to intrude and in any other connection state by subscribers of both types of authorization the same switching means of the connection sets Switch on a signal at the attendant console.

Further details of the invention will now be based on the exemplary embodiments shown in the drawings described in more detail of which

Fig. 1 two subscriber circuits with differently authorized subscribers and a consultation line,
Fig. 2 the transfer of office,
Fig. 3 the house connection route,
Fig. 4 shows the transfer to the office for evaluating several authorization codes and

709 758/15 &

Fig. 5 shows subscriber circuits of other differently authorized subscribers.

Establishing a house connection

If the subscriber wishes α or δ (Fig. 1) to set up a house connection, he occupies a house connection path in a known manner by removing his handset. Relay R (T) is excited via the subscriber loop. The relay T (I) lying parallel to the resistor WiI does not receive sufficient response current. After energizing the relay R, it is disconnected by contact rl. Contact rill identifies the calling line in the test circuit of the left caller AS. The latter is started via a contact of the relay R in a known manner, not shown. When the test arm of the call seeker AS hits the line marked by contact r III, different test circuits come about, depending on which subscriber α or δ had occupied the house route. The following test circuit is closed for the subscriber δ as a subscriber who is not authorized to connect:

Fig. 3 +, 41 (111) ... SFl, Gl, xhllll, (c-arm of the AS), line ec to the subscriber circuit Fig. 1,

Test wire, grooved, -

Γ (ΐΐ) '■

Relays A1 (III) and T (II) respond in this circuit. The relay R (II) continues in this circuit when the winding R (I) is de-energized due to the reversal of the contact part, ill. The relay SF1 in this circuit has fault current and therefore does not pick up.

The following circuit is closed for subscriber α as an authorized subscriber:

Fig. 3 +, 41 (111) ... SFl, Gl, xhllll, (c-arm of the AS), line ec to the subscriber circuit Fig. 1, tY, rTY, Wi2

40

The parallel connection of the relays R, T and the resistor Wi2 causes an increase in current so that the relays 41 (111), SFl and Γ (II) respond in the circuit. The response of the relay SF1 causes an authorization identifier in the house connection path, by means of which, as will be described later, a connection to a subscriber found busy can take place. Contact all switches on the relay Vl , which switches through the speech wires with its contacts ν II and viii.

After occupying a house connection route, the subscriber or δ can use his dial to deliver the dialing impulses required to set up a house connection in a known manner. The relay 41, which receives these dialing pulses, sets the line selector LW in a known manner, not shown, to the desired subscriber line.

If the subscriber α finds the selected subscriber line occupied, he can intrude on this occupied subscriber line. He presses his ST button, which creates the following circuit:

Fig. 1 +, ST, line al ..., line «to 45, line ea Fig. 3, ν II, Xl (I), Al (T) ..., -.

The relay Xl responds in this circuit. Relay XHl is energized via contact xl III. There is no potential across the βδ wire in FIG. 3 and the relay 4 U is not short-circuited via the contact χ III, which is switched over when the button is pressed. After releasing the key ST , relay Xl and then relay XHl drop out with a delay. The relay 4 U is held in the following circuit:

A JT

+, DlIII, -4 ^ r-, a «-IV, ödII, pY, WiZ, -. Vr 1

In the test wire, the contact IwO was closed when the line selector was set, so that the test wire is not interrupted after the relay Xl has dropped when the relay XHl is still energized.

The contacts aul and aull cause the intrusion, during which a special ticker symbol Ti can be placed on the line as a sign for the subscribers that a third subscriber has switched to their existing conversation. In this case, the contacts α «III and auY cannot cause a sleep process, since the relay P is not energized when the line selector checks that the subscriber line is busy and the connection leading to the line ec is thus interrupted with contact ^» IV.

If the subscriber δ finds the selected subscriber busy, he cannot trigger an intrusion because, as already described, the relay BFl did not respond when the house connection route was occupied. If these participants operate its key ST thus says, as already described, the relay Xl and contact xl III relay XHL to. The AU relay is energized for as long as the button is pressed without being able to initiate any processes. After releasing the button, relay AU drops out again, since contact bv II is not actuated and consequently no holding circuit for relay AU is closed. The contacts bvlll and δι »Uli prevent that a connection is possible during the brief excitation of the relay 4 U.

Exchange connection

If a subscriber α or δ wishes to set up an exchange connection, he first occupies a house connection set in the manner already described by picking up his handset. Then he presses his earth key ET. The differential relay Xl in the house connection responds and switches on the relay XHl via its contact # 1111. When the ET earth button is pressed, both speech wires are earthed, so that the AU relay is short-circuited via the switched contact # 111 and consequently cannot respond when the contact xh III is closed. Relay AU is delayed so that it cannot be energized even after releasing the button and releasing relay Xl while relay XHl is still energized, ie over the release time of relay XHl. The test wire ec is disconnected via the release time of the relay XHl, since the line selector LW has not been set and the contact IwO is open. The circuit for the relays R (H) and Γ (II) in the subscriber circuit is interrupted. The occupied house connection is free

^e ° given. The relay R drops out, while the relay T remains energized, because it is via +, ET, ST, line al ... a, rl, T (T), - during the earth button is pressed and after releasing the button via the subscriber loop in the following

65 circuit is held.

, - = ^ - , xhlll, WiZ, -

the relay AU is switched on. By pressing the ST key, the δ wire is separated so that on the +, ... rll, ill, line b ... bl, subscriber loop, ST, line al ... a, rl, T (I), -.

Relay R de-energized, relay T energized, causes an exchange dialer AW in a known manner, not shown, to respond to the contact tV

5 6

signed extension checked. For a subscriber b , the interrogator switches to the exchange line and

the following test circuit is established: interrupts the circuit for the with contact from I.

Fig. 2+, ... BV, AW, ec-Mex, Fig. 1, c-wire from relay 5 (I) and £ H whereby in the already described

° R (Il) way the call status is canceled during the transfer.

AW, tV, —-——, -. 5 If a subscriber wishes α or b during an official

(> 'call a query with another participant

For a subscriber who is authorized to switch α comes to hold, he presses his key ET. When actuated

the following test circuit is established: the ET button is connected to earth on both speech wires.

Fig. 2+, ... BV, AW, ec-wire, Fig. I ₁ c-wire from ⁵ ^ f · ^s ° ^{that da} * Diöerenzrelais X and after the

TTT / TTT WT ^'10 Contact «! is switched, while the button is still pressed

aw, tv, - > - ■ ^E ~ ^{T the relay u βτκ} & ^becomes

K (Li) j 1 (il)

In the test for the non aufschalteberechtigten + ^{on the e "vein xI} · ^{uhl <u (ll)>} -. · Participants b the relay R (Il) is turned on and the contact" VI interrupts by contact # 11 a relay Γ (II) held, while in the test circuit for 15 switched circuit for the response-delayed subscriber α except for the relay relay E (II), which can therefore not come into effect. i? (II) nor the relay BV in the exchange line responds to contact u I and μII switch the exchange line to and, as will be described later, the exchange line consultation line Rf , while contact wants an indicator that the calling subscriber is authorized to connect the holding bridge between the speech wires in the direction of the public office Contact uV becomes a current

After the trunk line has been seized, the partial circle for the relay UH can be prepared, which after the

subscriber α as well as subscriber b in the same known, relay XH, which was switched on with contact χ IV,

Establish an exchange connection in a manner not shown. comes about. The occupied on the inquiry line

If a subscriber wants a house connection set during the exchange call will hold his key ST after the delayed inquiry with the operator, then press the relay XH and open the loop to the beer. When the ST button is pressed, the house connection is transferred

the following circuit is established: _TT7 . _{C TTr TT 7T Ti TT}

+, WtO, uvf, bvll, xhl, α Rf-Ltg. to the house

Fig. 1 +, ST, line al ... a, Fig. 2 line ea, connection path ν 11 (Fig. 3), Xl (I), A 1 (I) ..., -

AVv, A (1), A (L) ..., . _3o horny, if the participant causing the inquiry

The differential relay X responds in this circuit. is authorized and therefore relay BV in the

Contact λ'II closes the following circuit for the relay trunk transmission (Fig. 2) is energized. The resistance Wi6

E (II): is dimensioned in such a way that only the

1 ^ TT ", ζ, ττ", Λ7Ύ ai, TT F λγτ \ relay A 1 is held, but the differential relay Xl

~ r ~, X 11, ΉιΙ 11, MVl. eil Xi, XS 111 j,. · Ϊ́ι ι -ι τγ ι · ι · ί ι ■ ι -! ■ ·>

35 cannot respond. Has em authorized

Contact el closes a circuit in which the relay subscribers via the inquiry line to a house

E (I) is held, if after releasing the button the connection path is occupied, then when the house connection was occupied

Relay X drops out and with its contact λ; VI the short connection path through the in the inquiry line

The EH relay closes and this relay responds. RF line (Fig. 1) Responding relay RF following current

_T "" 40 circle came about:

+, Eil), el, EH, ail, ..., -. ^s

. ,,. _{T y} , _r ^. _{n Tr} Fig. 3 + Ml (III) ... , 571, G /, «Al III, Ader ec zur

With contact ehlV the lamp UL is connected to the feedback line c (Fig. 1) rf I,

communication made to flicker. Above contact eAIII j-p and the night switch becomes a free participant

and the night switch becomes a participant ψτττ, _7Γ = ^ =. === r =, -. sign FrZ applied, whereby it is seen that the comparison 45 ^ ^{111 'R} f ~ ^Lt e- ^ - (S- ^{Fl 2) hvlll <WL5} averaging present. If the operator is absent, ie the relays A1 and 571 are night service in this circuit, the subscriber receives over excited. When relay 571 responds, the night switch is activated and the busy signal is activated. It was identified that someone authorized to switch presses his ST key again. Relay X subscriber occupies the house connection route. Has one speaks again. The relay E (I) is short-circuited by the actuated contact ehl 50 unauthorized subscribers, and contact ^ VI, the relay E (I) is short-circuited, the connection is occupied, so the relay responded so that it drops out. The circuit for the second winding RF came about as follows: the relay E (II) is separated by contact eh II, so “. " _{R ,.} ,, τττ. _π _ _T "". _{7th TTT} . That the closing of the contact xll has no effect. ^ JJ + '^ ™'' J- ^V \\ ^' / UF ' ^AdereC When contact el is opened, relay EHiXa remains at 55 ^to return line c (Fig. 1) rf I, TF, -. Duration of the key-press over In this case the relay BV is in the office over- _. __, _ transmission not excited, so that no current branching occurs with +, ehl, EH, abl, ..., - _the occupancy, ie there is no current behavior. Only after releasing the button and thus strengthening. In the above-mentioned circuit, therefore, when the relay X drops out, the relay EH drops out. 60 only the relay Al, but not the relay BV energized. The call status at the switchboard is deleted. If the subscriber causing the inquiry is not authorized to switch on the previously flickering lamp via contact eh IV, the house connection path is brought to light up again continuously. The part- through the subscriber α or b formed from the contacts xh I, bvll, Wi4 , who kept an entry sign to the mediation loop. Can give over the occupied house connection route, is thus able to re-establish the call status by pressing the S-T button again.

to lift. The call status (flickering of the lamp ÜL) can

can also be deleted by the operator if the subscriber is busy and the calling subscriber calls

this is authorized to contact the exchange line by pressing their AT key. The participant α operates his

line turns on. The query from relay responds 70 ST button. Pressing the ST button turns earth

7 8

placed on the α or ea wire , so that the relay X is in the following circuit, in which the relay U through

Office transfer responds. By switching on the opposite winding L ^r (II) is thrown off.

+, # 11, uhll, bvl, VH [I), - Fig. 2, + on the eJ vein, # 1, U [I), U [II), -.

the relay VH in the official transmission einge- 5 After releasing the key ET, ie after drop of switches is. Contact part puts direct earth over u IV, foil, relay X and XH, relay UH also drops out. The xhl, to the «-wire of the inquiry line, so that the inquiry status is canceled again, and the partial relay Xl in the housekeeper seized via the inquiry line is switched through to the office again. Connection path (Fig. 3) responds. Contact ^ l III switches in the Andas relay XHl described with reference to FIGS . 1 to 3, which with its contact xh III io order switches on the switching processes for two under the relay AU . Relay AU is described by differently authorized participants. Like in

will be described below with reference to FIGS. 3 to 6

+, alIII,, aulV, bvl, pY, WiZ, - soll, it is possible to have other authorization scenarios

to be eliminated.

held. The activation is complete. 15 Fig. 4 shows an office transfer required for this.

If, on the other hand, the calling subscriber does not intrude- Figs. 5 to 6 show the subscriber circuits of two

authorized and he finds the further differently authorized subscriber stations requested in the inquiry.

Subscriber busy, so he cannot intrude, _H ...

j edoch a call to the house connection by pressing his key ST

effect the mediation. 20 It is initially assumed that the participant

When the button is pressed, the relay X Tlnl (FIG. 5) speaks in a known manner, not shown in detail

in the transfer of office. Since the subscriber b is not occupying a house connection route, a house connection

Subscriber authorized to intrude when seizing the outside line and occupied the desired subscriber

transmission could not energize relay BV , has found coming. When using the house connection route

after energizing relay X, the following circuit for the 25 had Tlnl through the subscriber authorized to connect

Relay i? (II) established: the relay SFl addressed. So press this

_, _DD . If the participant presses his key ST, the call is activated

+, «II, uhll, bvl,« VI, ehll, E [Il), -. _{in the} manner already described. On the other hand, did the part

The relay E is switched on and via its own subscriber TIn 1, the desired subscriber found free contact el and its first winding is held. After Los 30 and he wants to make an individual call in the holding circuit of the place during the house call on the transferring of the button S-Γ, he actuates relay E (I) to relay EH and causes his button ST. The differential relay Xl (Fig. 3) speaks contact eh IV the call to the operator (flickering and switches with its contact χ Uli the relay XH1 of the lamp ÜL). Is the part you want in the inquiry. Via the contact λΜΠ, the AU relay is free for the user and the inquiry call comes into play. 35 Duration of the earth button is switched on, since contact pV is on, both the person authorized to connect and the holding circuit can be disconnected. Also about the non-authorized participant in this

Call status with the operator an input + '««} · £ ^A ><«ί, ¹ . ¹ - ¹ '^' ^xhllU ' ^AS ' ^{line ec}

Turn on the step sign. With the not Aufschalteberech- ^or - ^{c m tlg} - ⁵ ' ^{ωί >> Μ} · ⁺

Authorized participant, this happens in the already described 40, the capacitor CK is discharged and by the way. Discharge current switched on the relay H , which is

When the subscriber is authorized to switch on speaks when his contact All holds and with his contact AI pressing the ST button, the relay X in the office over- the individual lamp ULI flickers and carries on (Fig. 2). Contact χ II switches on the relay VH via uh II, bv I and the relay VH, which generates 45 with its contact vh II.

direct earth to the α-wire of the inquiry line, then the subscriber had 77 »2 (Fig. 6) as not

that in the house connection path (Fig. 3) the differential to switching subscriber responds to a house connection relay JO. Contact xl III switches off the relay occupied, so the relay SFl was not energized. XHl a. The AU relay is energized via the contact grill. If this participant finds the selected participant. However, this relay AU cannot hold because the 5th is occupied, it cannot intrude. However, he can contact j> V has opened. It thus only keeps an individual duration of the key press by pressing its key ST. During this time, a call will result in the operator. As already charged capacitor CK was written in the following circuit, the relay AU is briefly discharged when it is energized. and the capacitor CA 'to the subscriber circuit

55 leading line ec laid and discharged, whereby the

Fig. 3 +, auV, CK, α «III, fi IV, # A1III, Ader ec, relay H responds and causes the individual call. Fig. 1 Inquiry line c-wire, tf III, c- wire Rf-Ltg. In the same way, the subscriber TIn 2 can during the transfer of office Fig. 2, GIl, E (I), +. of a house call generate the individual call.

The discharge current of the capacitor causes the relay E (I) to speak to the ⁶ ° trunk connection, which is via its own

Contact el keeps. After the key has been pressed, the subscriber Tlnl has a in a known manner

or discharge of the capacitor is the relay EH office transmission (Fig. 4) occupied, then again, how

switched on, which has already been described with its contact eh IV, which is the activation authorization

Lamp ÜL switches on and flickers. ⁶ 5 characteristic relays BV2 energized. Does this part-

The cancellation of the inquiry and the switch back before the exchange connection is established or

An individual call is made to the waiting exchange line subscriber in a known manner during an exchange connection

Way by pressing the earth key ET, whereby to generate at the switch, so he actuates his

both wires ajb and eajeb earth is laid. Relay X button ST, whereby the wire ea is grounded and at the same time the

responds, and via the relocated contact λ: I comes 7 ° other wire is disconnected. The differential relay X 2

9 10

speaks to. Contact # 21 closes the following electrical circuit discharging. Relay E2 (II) is in the discharge circuit

for the relay E 2 : (Fig. 4), which responds and with its contacts e2II

-I- A2 (I1) x2l uh2l u2I \ E2 (l \ ^unc * ^e ^ ^ ^en capacitor CKl to the ec wire of the

'' 'Transfer of office sets, whereby in already described

Since the vein eb is separated, that is, there is no 5 way of making an individual call to the operator

Potential comes from switching the is effected.

Contact # 211 no circuit established. If, on the other hand, the subscriber had found the delayed relay XH2 selected subscriber occupied in inquiry cycle # 2IV, he can switch. This relay has the task of activating the circuit by pressing its ST key to the participant that has been found occupied for the delayed relay E2 for a long time. In the manner already written, so that if the key is pressed very briefly, earth is connected to the «-wire of the inquiry should and the relay X drops out again, the line can be laid and the relay AU in the house connection set relay E2 can respond. The contacts <? 2II and e2I are excited. In this case, the relay AU drops after completion, connect a capacitor C-Kl to the ec wire. This of the earth button pressure does not decrease, but remains
Capacitor is in the direction of the subscriber circuit 15 ^ jj

discharged because the rectifier G / 3 discharges into the -f-, υ 1 III ,, auTV, bvtl, ftV, Wi3, -
opposite direction prevented.

This is excited in the discharge circuit of the capacitor CK 1 and causes the connection via the Kon relay H, which responds. bars aul and aull. The activation of the contacts «wants" ,, ",.,.,. , ",. ,, 20 and auV have no effect since the condensation

⁺ i , ' _ΚΛ 'JZ'tt ^{CC ZUr subscriber} "sator CK not discharged through the open contact fVf

circuit, wire c, Gl5, H, +. _can _

The relay H is via its own contact Has the subscriber Tln2 in a known manner

held and at the same time occupies a capacitor Ca in the trunk transmission, it can not be switched on.

Wire α laid, which prevents the relay BV2 from being switched on via the 25 authorized subscribers.

Subscriber loop the relay EH2 in the trunk He can however in any connection state, ie before

address, since the external connection is established with contact e2 IV, during the external call,

Short circuit was canceled. With contact AI, the is activated during a consultation call and when the line is busy

individual call at the operator console by flickering of the subscriber selected in the inquiry

the lamp ÜL 1 generated. 30 Generate an individual call at the operator console. He

If the subscriber Tlnl during an exchange presses his key 5- T ₁ so that the difference call conducts an inquiry call, he presses relay X2 is operated. When the button ST is pressed, its earth button ET, whereby both speech wires are earthed before or during the exchange call, the relay E2 will be. After response of the differential relay X2 comes over
the relay V2 via 35 _{+ j Α2 {ϊ1)>} # 21, «A2I,« 211, £ 2 (1), -

+ on line eb, # 211, «A2II, £ 72 (1), - _{and if the line is busy or free via the inquiry call} .

to address and prevent the subscriber dialed by his contact u2 II line, ie in return

the response of the relay £ 2. The contacts u21Y and asks about

U.2111 switch the exchange line to the inquiry line 40 _{+ A2 (S1) χ21 uh2l bv2U u2U E2 {1)} _
um, over which a free house connection route is occupied,

on which the participant is switched back in a known manner, which in the manner already described the

can build up a question and answer session. When a free activation of the individual call is activated.

House connection route is, as already on hand The participants α and b are in their mode of operation

1 and 2 has already been described about the contact 45 with reference to FIGS. 1 to 3. the

bv21V a current amplification effective, which is occupied in Fig. 2, which shows an exchange transmission that is required,

House connection route the activation of the relay BVl if only participants are present who have an immediate signal

causes which the intrusion authorization of the part can trigger at the attendant console, d. H. only those of

Tlnl's subscriber . With contact «2 V, an external transfer is assigned and not an individual transfer

be able to switch on a bridge over Wi4 between the speech wires to the lamp, must be in such a way

Keeping the office connection laid. The downshift Fig. 4 can be changed if there are also partial

of the inquiry has already been added on the basis of Fig. 2 takers who should be entitled to a

so that it can be dispensed with here. to generate an individual call at the attendant console.

If the subscriber wants Tlnl during the inquiry, a comparison of the two trunk transmissions shows that this is the case

conversation an individual call to the exchange 55 only the relay designated in Fig. 2 with EH

to generate, he actuates his S- T key. The offset offset is at the point in which it is shown in FIG. 4 under the

Relay X2 in the trunk transmission responds. About designation EH2 was used. In addition, in

.., _TT , "τ,, -r ,. ,,, Fig. 4 only the capacitor CK 1, the

_{It already 2} existing relays E | + ·, / "(Π), # 21 and _ntakte after switching on the _K °.

■ f vui Ι π contact ^ 2IV the _{Re- 6o (in K 4 with E2 denotes} ⁶ _{et) to the} line ec

lai VH2 about contact # AE2i, uh2l, VH2, U H2, - _^[est £ _{tet werdeil; where nocl} / _the rectifier GlZ in

switched on. this line had to be looped in to

Via the contacts vh2 1, u2I, bv2l, # 211 earth will prevent the capacitor from being via the relay SF2

connected to the «-wire of the inquiry line and can thus be discharged.

occupied house connection path (Fig. 3) the difference 65 The instant sign ÜLA at the operator console is

relay Xl switched on. Contact # 1111 switches this on when the participant a presses the ST key

Relay XHl a, which is switched on with its contact xh III or δ in the following way,

briefly switches on the AU relay. The differential relay X 2 is activated by pressing the button

When aulll and auV cycle , the capacitor CK is switched on and the relay £ 2 (1) via contact # 21.

ec-wire or c-wire of the inquiry line laid and 70 The discharge of the capacitor CK1 remains without

I 018476

Effect because in the subscriber circuit of subscriber α or b no relay H is connected. In the subscriber circuit of subscribers α or b there is no capacitor in the «-wire. This means that after relay Έ2 has responded and the short circuit for relay EH2 has opened through contact e2 IV, this relay can respond via the subscriber loop with his Contact eh2Il closes a holding circuit and with contact ehZ 1 causes an immediate call to the operator console. The lamp ÜLA assigned to the trunk line is made to flicker.

Claims (14)

Patent claims: 1. Circuit arrangement for subscriber stations with two-wire connection lines and manually operated switching devices, one of which applies the same potential to both wires to carry out control operations and the other applies the same potential to only one wire to carry out other control operations and separates the other at the same time, for telephone systems with subscribers authorized to connect and not authorized to connect, characterized in that a certain identifier is transmitted to the connection sets when they are occupied by a subscriber who is authorized to connect, controlled by the call and disconnection relays, which has the effect that when one switching device (ST) is actuated, the applies a potential to one wire and separates the other wire at the same time, after previous selection and occupancy of the selected subscriber by influencing the feed bridges of the respectively occupied connection sets (X, Xl, XZ) switching means (AU, E, EZ) are switched on, di e make a connection to the occupied subscriber line, and that when the same switching device is actuated in the same connection phase by a subscriber who is not authorized to intrude and in any other connection state by subscribers of both types of authorization, the same switching means (X, Xl, XZ, AU, E, EZ) the connection sets cause the activation of a signal (ÜL, ULI, ÜLA) at the operator console. 2. A circuit arrangement according to claim 1, characterized in that- upon confirmation of the switching device (ST) on the part of the subscriber who is not authorized to switch and who is not allowed to intrude in the busy case of the selected subscriber (house call, inquiry call), the connection sets (Xl , XZ, X) activated switching means (AU, E) trigger certain switching measures (connection) depending on a further characteristic switching means (BF), but in any other connection state effect similar measures (signaling, ÜL, ULI, ÜLA). 3. Circuit arrangement according to claim 1 and 2, characterized in that switching means (H, EH, EHZ) are provided which turn on a signal at the operator station, either by a lamp assigned individually to the subscriber (ULI, individual call) or by means of each Trunk assigned lamp (ÜL, ÜLA, immediate call) is displayed. ■ 4. Circuit arrangement according to Claim 1 to 3, characterized in that the distinction between which signal is to be switched on at the operator console is made by switching means (EZ, EHZ) in the exchange transmission. 5. Circuit arrangement according to claim 1 to 4, characterized in that the subscriber stations authorized to issue an individual call are assigned switching means (H) which, when they become effective, cause the individual call and reevaluate the subscriber circuit in such a way that a check of the occupied connection device from (trunk transmission) the activation of the instant signal is prevented. 6. Circuit arrangement according to claim 1 to 3, characterized in that the subscriber station after actuation of the switching device (S-T) for switching on a signal at the switching station a character (free or occupied) is transmitted, on which the subscriber station recognizes whether the operator is present is or not. 7. Circuit arrangement according to claim 6, characterized in that the transmission of the character free or occupied to the subscriber station via the night switch (NU) takes place. 8. Circuit arrangement according to claim 1 to 7, characterized in that switching means (E, EH; E2, EH2) are arranged which the signal (ÜL, ÜLA) switched on by the actuation of the switching device (S-Γ) by the subscriber station at the switchboard delete by pressing the switching device (ST) again. 9. Circuit arrangement according to claim 1 to 8, characterized in that when an inquiry call is initiated by an authorized subscriber station, the switching means of the office transmission (BV2, BV) which is characteristic of the switching authorization and the switching means (RF) in the inquiry line cooperates in such a way that in the over the call-back line occupied the house connection route the identification of the activation authorization is transmitted. 10. Circuit arrangement according to claim 1 to 9, characterized in that when the switching device (ST) is actuated by a subscriber station which is in the inquiry state, switching means (E, E2) of the exchange transfer prepare the switching on of the signal at the switching station if this subscriber station is not connected, When this subscriber station is authorized to switch, switching means (VH) of the exchange transmission transmit a criterion for checking the connection status of the occupied house connection path, and that switching means (AU) of the house connection path, depending on the connection state, initiate either a connection or a return signal to the exchange transmission, through which the activation of a Signal at the switchboard preparatory switching means (E, EZ) comes into effect. 11. Circuit arrangement according to claim 10, characterized in that the return signal to the office transmission triggered by a capacitor discharge will. 12. Circuit arrangement according to claim 1 to 10, characterized in that after the switching means (E, E2) which prepares the switching on of a signal at the switchboard takes effect, a switching means (EH, EHZ) of the office transmission is released, which checks on the subscriber loop whether an individual Call or an instant signal should be switched on at the operator console. 13. Circuit arrangement according to claim 1 to 12, characterized in that the switching means (EH, EH2) at subscriber stations with authorization for individual calls by interrupting the partial receiver loop by means of a capacitor (Ca) cannot take effect. 14. Circuit arrangement according to claim 1 to 13, characterized in that the looping of the Capacitor into the subscriber loop through the individual call causing switching means (H) of the subscriber station takes place. Considered publications: German Patent Specifications No. 940 169, 913 064. For this purpose 2 sheets of drawings © 709758/159 10.57