DE1462335C - Subscriber circuit in telecommunications systems - Google Patents

Description

3 4

Line is smaller than the reverse voltage of the Zener- In the idle state flows on the subscriber loop diode that the transfer of an operating idle current via the following circuit: circuit-rated current increase as a call stimulus via + LB, Rl, ti, b, sk, EM, a, ti, RB, - LB. Since one of the contact sequence of one of the mentioned resistor R1 is dimensioned so that the first contact 5, which can be controlled by evaluation switching means, generates the idle current at the resistor R 1 and a voltage drop that can be controlled by another relay is smaller than the control circuit existing in the first contact, voltage of the Zener diode ZD, can in the idle state and that the said relay does not respond depending on the relay R,
The call status is in the following connection element considered here, the incoming signal er io example by pressing the call button at Teilregbar and caused after triggering the connection recipient Tn , whereby in the known through-connection drops out with a delay. 'Way the current in the subscriber loop increases

From the telephone exchange technology is admittedly loaded. The current flowing now is already known in the following as an arrangement for a preselector, referred to as a ringing current. The ringing current now flows with which it is possible, in addition to call recognition 15, to relay R and the Zener diode ZD both via the resistor R1 and via the falsely simulated call. The relay R is know. However, this arrangement requires a first contact r 1 assigned, on the under relays with three windings, as before, assuming this example underlying be that the connection made exactly to the electric operating values of this relay through a central Conditions to be observed . Already 20 device St is controlled, the central control for this reason is the use of such a device, the call is communicated. The central arrangement in a largely electronic device then switches a free connecting link via a switching system equipped, for example, with components that do not have three-contact couplers. the next level of connection, for example the

Compared to the previously known 25 transmission U to the subscriber circuit TS, the invention. Subscriber circuits in addition to the use of over the coupling contact k 3 is now a small and cheap switching relay still the advantage of lais T excited in the subscriber circuit. As a result, in the event of earth faults and loop faults, the contacts ti, t2, i3 and t4 of this relay are actuated by the subscriber loop in the catching state. Through the contact ti , the same excitation is a call evaluating switching means to the 30 circuit for the relay R separated, so that this does not have any special requirements with regard to it. The electrical operating values, which also fall as a result, must be set over clock rl, the incentive for the central device can be monitored. device Si switched off. The ringing current on the partial

In a switching system with a central receiver loop, the following control device can now flow with an arrangement according to 35 current circuit: + LB (in the following connection of the invention, in contrast to the previous link), ti, b, sk, EM, a, ti, k2 - LB (in the later known subscriber circuits the connecting link Ü following the call).

evaluative switching means, e.g. B. any relay, in a manner not shown here, a selection request is sent to the part immediately with the coupling to the next subscriber Tn , whereupon the switching element of the connection path is switched off again with the transmission of the dialing information. Claiming one call wins. As soon as the desired participant is reached, the switching means is therefore accordingly the transmission Ü receives a connected signal. About lower. the contacts becomes a circle of excitation for the in

Details of the invention are given below in the subscriber circuit TS relay FH

given on the basis of the description of a figure. 45 formed (earth, tA, FHI, - WB). The participants-

In the drawing, as an example, a subscriber line is also used during the write state, .von

circuit of telecommunications technology a subscriber is fed to the connecting link Ü from (± LB im

circuit for a telex local participant subsequent link, kl, ti, a EM, sk,

shown. b, ti, - LB in the following link).

The part symbolized in the drawing by a receiving magnet 50 The triggering of an existing connection EM and a send contact sk takes place in a known manner by evaluating the subscriber Tn is connected to the subscriber circuit at a subscriber circuit TS via a subscriber line TnL with a terminator im. The part-switched connecting link. The holding circuit TS, for its part, is opened in the illustrated circuit of the coupling relay, so that the individual th examples connect the coupling cores to a non-55 coupling contacts' kl to k 3 via a network NW on the transmission U shown in detail. In the subscriber circuit TS falls as a result. The switching takes place in the illustrated of the relay T and switches with its Kon case via coupling contacts k 1, k 2 and k3 as well as clocks ti and ti, the coupling wires 1, 2 and 3 in the rest position shown go back, the relay R again in the original coupling contacts happens in a not shown 60 borrowed manner to the subscriber line. By way of a central facility Si. Invention subscriber Tn itself becomes high-resistance again as a result of polarity reversal, which according to the invention contains the subscriber circuit TS as a subscriber line. Since the possibility of switching means evaluating the call an arbitrary possibility cannot be excluded that in the relay R, for example an ES / £ relay, the polarity reversal as a result of the line capacities briefly parallel resistor R1 and a Zener diode ZD in 65 recharging current surges arise through the the relay R series are connected. Furthermore, the partial responsive contains at its reconnection, thereby slave circuit, a relay FH, the r with his Wick- via its contact 1 erroneously cause a stimulus lung FHI via the contact 14 is excitable. to the central facility, the relay is FH

executed with delayed release; ζ. B. via a capacitor C This means that the contact fh'i assigned to the relay FH is only returned to the idle position after a certain period of time: The release of a Rüfsignaiisierürig to the central device is therefore 'only then seen'ii; when the EihschWlfigvörgärtge caused by a trip on the subscriber line are completed.

The drop-out delay of the relay FH enables, as will be explained in the following high, together with a second contact fh 2, that the switching means R evaluating calls can also take over the tasks at the same time; fake calls involving dutch interference, e. B. earth or loop closures, caused to catch:

Üürch this advantage of the circuit arrangement according to the invention; näriilieh that the Aürüfe evaluating Scliältmittelj _z: B; The relay R in the figure, also used to monitor for loop or earth faults in the line, is the previously required ÄiiMähd for a second; De'n Färtg'züs'tand triggering halves are no longer necessary. The mode of operation of the relay R beirii catches a call caused by loops or earth faults in the following.

An earth or disarming circuit leads to the response of the relay R as a result of an increase in the height of the relay, like the actuation of a call button or the lifting of a telephone call. In the example considered here, the Fefnscrireibte'chnik eritnöirlmenen example, a 'normal call stimulus is first fed to the then actuated contact rl of the tenfold device. B. a transmission Ü-, ari the participant low-level switching on the Köpbelköütäkte switched on. If there is no choice; §Ö is in 'depending on a "z. B.: the dialing signal monitoring, liier not shown, device vötti Vefbindüngsglied a - busy signal sent back to the subscriber circuit via the subscriber line; the relayFH is excited via the contact? 4 The connection element Ü connected to the subscriber circuit, the connection between the subscriber circuit TS and the following connection element Ü is triggered. The relay Γ drops out and switches the relay i? back on to the subscriber line via its contact il. ?, barren Schleifehschluß - in niedei-resistance state, whereby the relay again result responsive / of the drop-out delay of the relay FH is fh at the time of the contact i geöffrtet; so that the control of the central device St is omitted; in addition, the relay has FH one. second contact fh 2-, via which a holding circuit is prepared for the winding FHl is; The relay R also has a second contact / · 2, via which the hold circuit for the relay FH is finally closed (earth; fh 2; rl, FHIi -WB). As a result, the contact fhl of the relay FH remains open for the duration of the loop or earth fault.

Only after termination or elimination of the disturbance is the hold circuit opened by the contact r 2 which is then actuated; After a certain fall time, the relay R is available again as a call evaluating switch:

The central device St can be notified of the fault ätif the subscriber line via an input F and sent from there to a monitoring device; A third contact fh 3 of relay FH ensures that the subscriber line is marked as busy in the same way as with normal occupancy by ί 3:

In the present example, the invention was described on the basis of a telex switching system with a central control device; The “. Arrangement can of course also be used for other systems * ±. B. on Ferrtsp'techverrttitthmgssysteriie.

1 sheet of drawings

Claims (5)

Patent claims: 1. Circuit arrangement for subscriber circuits in telecommunications systems, in particular teleprinter and telephone systems for evaluating calls and for catching falsely simulated calls caused by interference, characterized in that a current increases on the line evaluating from the series circuit of a call evaluating switching means, preferably a relay ( R) and a Zener diode (ZD) as well as a circuit consisting of a resistor (R 1) connected in parallel with this series circuit, in which the voltage drop across the resistor (R 1) when the line is idle is less than the reverse voltage of the Zener diode (ZD) that the transfer of a rated circuit in said power increase as a call stimulus over a group consisting of the contact sequence of a controllable from .genannten rating switching means (R) the first contact (rl) and of a controllable by a further relay (FHL) first contact (FHL) control circuit happens, and that the ge The so-called relay (FHl) can be excited as a function of a signal coming from the downstream link (Ü) after the connection has been switched through (via i4) and drops out with a delay after the connection has been released. 2. Circuit arrangement according to claim 1, characterized in that the relay (FH 1) after switching through to the following link (Ü ) interrupts the control circuit via its first contact (fhl) and switches off the transfer of the call stimulus and that a renewed provision of the control circuit only takes place after the delayed release of the relay (FHl) . 3. Circuit arrangement according to claim 1 and 2, characterized in that an excitation circuit for the relay (FH) is formed even in the case of a fake call caused by disturbances (z. B. earth or loop fault) on the subscriber line and that if the continuation of the Disturbance in the renewed provision of the call evaluating switching means (R) the connection of the device (St) switching on the other connecting elements is prevented by the actuated contact (// t 1) and that 'both the relay (FH) and the switching means evaluating calls (R) each has second contacts (fh 2, r 2), via which a holding circuit for the relay (FH) is closed and is only opened again after the fault has ended. 4. Circuit arrangement according to claim 3, characterized in that an output (F) is present in the subscriber circuit (TS) via which an error message is available when the contacts (fh 2 and r2) are actuated. 5. Circuit arrangement according to claim 3 and 4, characterized in that the relay (FH) has a third contact (/ A3) via which a subscriber circuit disturbed by a simulated call of an incoming occupancy is reported as busy. The invention relates to a circuit arrangement for subscriber circuits in telecommunications systems, In particular teleprinter and telephone systems for evaluating calls and for intercepting calls Interference caused fake calls. Recent developments in telecommunications, in particular Telegraph and telephone switching technology, aim at smaller components too ίο use that work faster and more reliably than the previously known. In such switching systems, for example, a connection path no longer set up via voters, but via switching fields. To increase the speed with The connection is set up and thus the profitability of a rental system is handled by the connection control via central control devices. This gives the option of electronic To use components. However, new problems then arise, since many of the components used so far are from structural Reasons can no longer be used and new components, for example in electrical aspects do not easily meet the previously required conditions. Such a thing The problem arises particularly when this is used in conventional switching systems Reputation relay by a smaller and cheaper one. Switching element, although its structural design / accommodates a new switching system, but in its electrical properties the conditions which are placed on a call relay does not correspond. Call relays previously used in switching systems had to distinguish between Idle state and call state on the subscriber line have the largest possible fault current value. Since the idle state once through an operational idle current, on the other hand., But also through a leakage current that z. B. as a result of unfavorable conditions between the line cores or between the line and earth flows, the dimensioning of the call relay is of particular importance.
Another component that deserves special attention in this context is the catch relay used in previous telecommunications systems to catch an impermissible short to earth or loop. This relay must also have very specific conditions in its operating values. enough. In both cases the values must of the relays used accordingly precisely for ^! Responding, fault current and dropping out. Smaller ones, "'Cheaper and more suitable in terms of their design features Switching elements have this required Values may not. It is the object of the invention to provide a circuit arrangement with such smaller components for Subscriber circuits in telecommunications, in particular telex and telephone switching systems create. According to the invention this is achieved in that a current increases on the line evaluating from the series connection of a call evaluate the switching means, preferably a relay and a Zener diode and a resistor connected in parallel with this series circuit There is a circuit in which the voltage drop across the resistor in the idle state