DE1537872C3 - - Google Patents

Description

The invention relates to a circuit arrangement for preventing double assignments in one Intercom with several participants and one connection set, with each participant circuit a coupling relay is used for outgoing and incoming traffic.

This is already suggested for intercoms with only one connection set and several participants been switching through the connections by using separate coupling relays for incoming and to simplify outgoing traffic. This separation in the connection is special advantageous if the only connection set has direction-dependent amplifiers or the The system works in four-wire operation.

These systems require special precautions to avoid double assignments from calling subscribers to prevent. In the known systems, the coupling relays are assigned auxiliary relays, which are connected via chain connections ensure that only one coupling relay is triggered. If at the proposed intercom with two coupling relays per subscriber circuit the coupling relay for incoming traffic still as Occupancy auxiliary relay is used for the coupling relay for outgoing traffic, this type of elimination can no longer be used economically due to double assignments. All coupling relays should can then be provided with additional contacts.

There are also circuit arrangements for the prevention of double assignments known in which * - ' Threshold switches are used. The * threshold value switches are switched on in a test circuit and respond if two or more occupancy circuits are controlled at the same time, which lead to the same test circuit. The response of the threshold switch blocks the occupancy circuit so that no occupancy takes place. These known circuit arrangement requires, in addition to the selection switching means, the occupancy circuits switch, additional test and occupancy switching means, so that these known protective circuits against Double occupancy for intercom systems with a few intercom stations are too expensive.

It is the object of the invention to provide a circuit arrangement for preventing double assignments in an intercom with several participants and a connection set, in which per participant circuit A coupling relay for outgoing and incoming traffic is used to create the one without the complex and failure-prone contact chains Λ get by. The new circuit arrangement for such Intercom is characterized in that the coupling relay for incoming traffic as an auxiliary occupancy relay is coupled to the subscriber line that the current flow in the multiple line for all Coupling relay for incoming traffic is monitored by a threshold value circuit that responds of two or more coupling relays for incoming traffic, the multiple line for the coupling relays interrupts for outgoing traffic. In this way, in the central control of the system without contact chains the booking process can be secured against double bookings.

The triggering of the coupling relay already mentioned is initiated by the fact that in the multiple line a transistor switching stage is looped in for the coupling relay of the outgoing traffic, which from Output signal of the threshold circuit is controlled.

Allocation of the central control with the dialing acceptance is triggered by the fact that at the output of the transistor switching stage in the multiple line the Coupling relay for outgoing traffic a transistor switching stage is coupled with an occupancy relay. Included the occupancy relay interrupts the circuit of the

3 4

Coupling relay for incoming traffic and closes sistor 72 to respond. The contact of the holding circuit of the coupling relay for outgoing 611 therefore closes a circuit for the coupling traffic, relay A 1, which runs as follows:

A release of the connection when responding _ | _ _{> s} g _c ^ _s ^ 2, DIl, 35, 611, A 1, 23, Ti, R4, -.

of two or more coupling relays for outgoing 5 _A , ,,, ·,. . "^ ^. ,. ■ _o ,,,, .... Γ-u * j ο α A voltage traffic arises at the resistor A4 in that at the output i_ «« jj τ · * τ-- »* * >> πι, τ. . , ... ,. ⁶ , ,, - _1C Λ, -. ^{6th &} drop, which controls the transistor 73. The two transistor stages in the multiple line of the, ■ _o - ... r ,,,.,,,. -. .,,,. , .. ν,. ,, ι. ^ · r. u ii ting re ais S3 responds. Via the contact s31 Koppe reais for outgoing traffic a sweat - ■? . η ι * ι · »- ji ^ ι ι ■ _n ,

¹ I ^ ...,,. . . .., · _A , is the occupancy circuit for the coupling relay Bi

value switching is coupled when responding. ^{,, ö} " ^ö _n . . ",, _, ..,» * λ ^ w- ,,

? u ^ ι · t- uuj interrupted. The relay Bi drops out. The contact s3l

of two or more coupling relays for outgoing io, _. . . "_ ... _o , _IT . ,.

.,,,,. _o , * ι · -U jT-1 u of the occupancy relay 53 closes the holding circuit

Traffic the occupancy circuits via the subscriber _c ..,,? ,, · ,,, · _t,. · ■■ * <.

,. , .Ρ .f _lt ", ·, ..,. r ,, for the Koppeire ais Al, which proceeds as follows:

mer line and the holding circuits for the coupling ^yv ' ^s

Interrupt the relay for outgoing traffic. These +> s3 \, D6, s9cl, D4,26, all, A 1,23, Tl, A4, - ..

Threshold value circuit switches the response circuit. The occupancy relay 53 also takes over the

of the occupancy relay ineffective. 15 Connection of the dialing recording to the

If, in the worst case, two cores of the connection set are switched through

Coupling relay for incoming traffic addressed by the subscriber line.

then this double assignment will exist until the assignment relay 53 responds

again canceled that the occupancy relay has the possibility of double occupancy, whereby in a

Threshold value circuit with the measuring resistor in the 20 double marking - two coupling relays Bl connected

Multiple line of coupling relays for incoming languages - and a double connection - two

Traffic is coupled and that the threshold switching relay A1 addressed - differentiated

responds when two or more coupling relays can be used for.

incoming traffic are excited. In this case, the threshold value circuit at the multiple subscriber stations would make two or more coupling relays for incoming relays in the form of a loop closure on the other hand, the switching stage in the multiple line of the coupling, then arises at the same time Resistor R5 in the multi-relay for outgoing traffic controlled with high resistance. specialist line 36 of the coupling relays Bl an increased voltage over this new coupling of the occupancy relay is voltage drop. The threshold value circuit with the Trandann triggering the coupling relay for arriving 30 sistor Tl is initiated by the contradictions in the control circuit so the traffic. set that with the inclusion of two and

The invention will be with reference to the more closed subscriber loops in the drawing, the switching simplified wiring diagram illustrated explained in more detail stage Tl in the multiple line 23 of coupling relays A1. is non-conductive controlled. The assigned coupling

In the subscriber circuit TS , the two relays A1 are in the affected subscriber circuits

Coupling relays Al and Bl. The relay Al switches with 7 * 5 can therefore despite the closure of the occupancy con-

its contacts all, α13 ... α14 the cores a .. .d clocks should not respond.

the subscriber line TL to the input of the The increased voltage drop across the resistor R5

binding set, while the transistor switch takes place via the threshold value circuit RS, R9, 73

stage Tr controlled coupling relay Bl with the contacts 40 through the occupancy relay 53. The occupancy relay 53

612 ... 615 the wires of the subscriber line with the speaks and interrupts with his contact s31

Connection set output connects. All part of the occupancy circuits. The relays Bl drop again

Subscriber circuits are with the output and the from and the assignment process must be repeated.

Multiple switch input of the connection set. This allocation process is therefore more expedient.

In the central control part Z, the multiple lines can be accessed by pressing the selection key or lines 26, 29, 34 and 35 coupled to the subscriber circuits 75 key.

the control potential + applied in order to determine the occupancy of the speech in the worst case once two coupling systems by a subscriber station to relay A 1, then this double connection will be able to do so. triggered by the fact that the output resistor R4

The control potential relay A 1 for outgoing traffic is offered to the multiple lines 23 and 36 of the coupling relays 50 switching stage 71 in the multiple line 23 of the coupling from the central control part Z via the coupling. member from resistor Rl and diode D 14 another

The assignment of the connection set, d. H. the threshold value circuit with transistor 74

speak of the coupling relay Al, is coupled under auxiliary. This threshold value circuit is designed

assumption of the coupling relay Bl as an auxiliary occupancy relay 55 sets that with two or more circuits via coupling

initiated in the following circuit: pel relay Al the increased voltage drop at the resistor

+, s9c3, s31, DU, R3, 29, D3, al4, d, a, all, ^% ^ ^R4 ^ "transistor 74 controls the relay

Dl Rl Rl 36 71 R4 - 59C responds and disconnects via its contact i9c3

all occupancy circuits, while the con-

Due to the voltage drop across the resistor R 2, the holding circuits for 60 cycles are also s9cl and ä9c2

the switching transistor Tr is controlled and the coupling relay A 1 is interrupted. The excited

relay Bl responds in the following circuit: Coupling relays A1 are triggered so that the double

4- cO ^ -1 <· ■ * -> D7 -Xd Ri Tr ie. Ri connection is eliminated. Via contact s9c4

the activation of the occupancy relay is prevented.

The voltage drop across the resistor R5 is enough 65. After the coupling relay Al is triggered, the

not off, the threshold value switching initiated again with the Tran occupancy process.

1 sheet of drawings

Claims (7)

Patent claims: 1. Circuit arrangement to prevent double assignments in an intercom with several participants and a connection set, in which per participant circuit each ^ n. Coupling relay is used for outgoing and incoming traffic, characterized in that the coupling relay (Sl) for incoming traffic is coupled as an auxiliary occupancy relay with the subscriber line, that the current flow in the multiple line (36) for all coupling relays (Bl) for incoming traffic through a threshold value circuit (R5, Tl) is monitored, which interrupts the multiple line (23) for the coupling relays (A 1) for outgoing traffic when two or more coupling relays (Al) for incoming traffic respond. 2. Circuit arrangement according to claim 1, characterized in that a transistor switching stage (Tl) is looped into the multiple line (23) for the coupling relay (A 1) of the outgoing traffic, which is controlled by the output signal of the threshold value circuit (R5, Tl). 3. Circuit arrangement according to claim 1 and 2, characterized in that at the output of the transistor switching stage (Tl) in the multiple line (23) of the coupling relay (AY) for outgoing traffic, a transistor switching stage (T3) with occupancy relay (S3) is coupled (R6, D13) ). 4. Circuit arrangement according to claim 3, characterized in that the occupancy relay (S3) interrupts the occupancy circuit for the coupling relay (Bl) for incoming traffic (s3T) and closes the holding circuit for the coupling relay (A 1) for outgoing traffic (j31). 5. Circuit arrangement according to claim 1 to 4, characterized in that at the output of the transistor switching stage (Tl) in the multiple line (23) of the coupling relay (A 1) for outgoing traffic a threshold value circuit (TA, S9C) is coupled (RT, D14), which, when two or more coupling relays (A 1) for outgoing traffic respond, interrupt the occupancy circuits via the subscriber line and the holding circuits for the coupling relays (A 1) for outgoing traffic (s9cl, s9c2, s9c3). 6. Circuit arrangement according to claim 5, characterized in that the threshold value circuit (Γ4, S9C) switches the response circuit of the occupancy relay (Γ3, S3) ineffective (s9c4). 7. Circuit arrangement according to Claim 1 to 6, characterized in that the occupancy relay (S3) is coupled via a threshold value circuit (RS, R9, T3) to the measuring resistor (RS) in the multiple line (36) of the coupling relay (Bl) for incoming traffic and that the threshold value circuit (R8, R9, T3) responds when two or more coupling relays (Bl) are excited for incoming traffic.