DE555013C - Circuit arrangement for telegraph systems, in particular for manually operated telegraph exchanges, in which a switching process is initiated by sending a pulse on the telegraph line and terminated by a pulse returning over the line - Google Patents

Description

The invention relates to telegraph systems, particularly to manually operated exchanges such systems in which a switching process is triggered by sending an impulse to the connected telegraph line initiated and by the receipt of a return via the line Pulse is terminated.

Of essential importance in such switching operations is the time between the transmission and reception of the pulses limiting the switching process passes. This time is referred to below as the pulse transit time and results from Most of the time from the switching times of the delay devices on the subscriber's side, which maintain the connection during the operating state, also from the switching times in particular In the case of long-distance lines, relays of the individual switching and transmission facilities are in series. It can be used, for example, in switching centers at the closing signal that would be initiated by sending out a long separating pulse, on which dependent from the switching times of the relays in the cable run, the return pulse into the individual switching equipment to reset the relay that is energized in the operating state brings about a long runtime of the impulse, especially with manually operated exchanges, result in undesired functions.

In Fig. Ι an example of a remote connection of a telegraph system is shown in principle, on the basis of which the occurrence of the running time and incorrect switching caused by the running time are briefly explained. The subscribers T ₁ and! T ₂ are connected via the subscriber lines L ₁ and L ₂ , the switching devices VE ₁ , VE ₂ and VE ₃ and via the trunk lines FL ₁ and FL ₂ . In the operating state, all contacts are in character, so that the delay relays V ₁ and V ₂ assigned to the two subscribers are energized and keep the connection through with their contacts V ₁ and V ₂ during the character transmission. If, for example, subscriber _{T 1} gives the final signal by means of a longer separating pulse, this signal is sent to subscriber connection T ₂ via the receiving relays E ₁ , E ₂ and E _{B of} the exchanges. Here the delayed relay V _{2 is} through the

*) The patent seeker stated as the inventor:

Ehrhard Roßberg in Berlin-Siemensstadt.

long separating impulse de-excited, so that back impulse initiated by opening the j ^ oMäkfeäfüller becomes, "-, = .-— ·. * - < ",

Is z. B. ^ the switching center VE _{1 of} the subscriber Ti is a manually operated control center, after the subscriber has issued the switch-off pulse if the connection is prematurely disconnected by the connection plug, a new call is brought about, which again when this pulse arrives a switch-off pulse, so that by repeating this game a permanent oscillation of the line relay is caused.

According to the invention are now to avoid such incorrect switching that by a long running time of a returning pulse can be caused, circuit means provided ,, which an initiated switching process, in its premature termination a faulty switching can occur, delay until the returning pulse arrives. These circuit means can very simply consist of a capacitor resistor arrangement which is known per se and which can be set for different running times. Each relay that, when initiating a faulty switching z. B. would be effective by sending a new pulse, is now so dependent arranged by the konderizer resistor arrangement that it does not in this case being affected.

An embodiment of the invention is shown in Fig. 2, which illustrates the jack connector of a four-wire trunk line. It is described with reference to the figure how by using the. The capacitor resistor arrangement provided according to the invention prevents incorrect switching if, after the switch-off pulse has been transmitted, before the corresponding control return pulse arrives, the connection is disconnected by pulling the plug. HW is a high-resistance resistor through which the capacitor C can slowly discharge when the relay T has dropped out or the contact t _{x has returned} to the rest position after a connection has been disconnected by pulling the plug VST.

When a call arrives over the long-distance line O ₁ , b _± the receiving relay ER puts its anchor , which was previously in the idle state in the wrong idle position. The relay R responds via the following circuit: negative battery, reversed contact er, contact t _m , winding J ?, and switches on the call lamp AL or some other kind of signal indicating the call via its contact r _{t and puts on contact r} / y, the transmission relay SR with the inven- tion provided according capacitor resistor arrangement in series, so that now the transmitter relays by on the condensate sator C in circuits +, capacitor C, folded down contact r _lv, contact t _Ih winding SR, battery middle MB flowing charging current is commutated and with his contact sr, which is thereby reversed from the false rest position to the operational rest position, returns the feedback pulse of the call that has been made via line a ₂ to the calling subscriber. By inserting the connection or interrogation plug VST , the call is switched off in a known manner and the connection is established in that the relay T in the test circuits earth, battery, winding T ₁ jack FKL, c-wire desVefbin'dungsstepsels, winding I and II of Relay P, earth responds. The contact in opens the circuit for the relay R. Contact i "switches the transmitter relay to the connection line. Contact # ,, applies negative potential to capacitor C and at the same time disconnects the circuit for the high-ohm resistor HW, through which the capacitor could discharge. "If the caller gives the final signal after the end of the call, the relay SR sends the disconnecting impulse to line a ₂ with its contact. When the feedback impulse arrives via line '%, b _x , the relay ER puts its contact back into the wrong one After pulling the connection stop, which de-energizes the relay T , the idle state is reached again. The capacitor C slowly discharges through the resistor HW,

If, on the other hand, the plug VST is pulled prematurely, i.e. if the disconnection is carried out before the response current surge arrives when the disconnection pulse has already been transmitted, the call state is initiated again when the relay Γ in test wire c drops when the plug is pulled, as the Contact% the relay R again he comes over the still located in the operating position contact with the response, so that the contact r / y to put aside and the relay SR would now just like the arrival of a call to bring back into the operating position in the absence of Kondensätorwiderstandsanordnung. The Kontaktsr gives a switch-on impulse to the line and initiates the call again in the other connection points of the connection that may not yet have been disconnected. The return pulse arriving in the meantime · the first initiated, final signaling, which the relay Ei? now brings it to the wrong position of rest, is restored by the return impulse of the wrong call originating from this connection

canceled, so that the relay ER is brought back to the idle position.

This mutual influence of the relays is avoided by the known capacitor resistor circuit in that the transmitter relay SR is not energized via the capacitor C in the event of premature separation and the associated reactivation of the relay R , since the capacitor is charged in the operating state in the sense that the transmission relay is prevented from picking up. By appropriately dimensioning the capacitor and the high-ohmic resistance, it is possible to bridge the practically occurring transit times or pulse delays.

If the connection is disconnected directly by pulling the plug, without first having initiated the final signal, the capacitor resistor arrangement also avoids incorrect switching when the relay R _{1 responds again as described.}

Claims (4)

Patent claims: i. Circuit arrangement for telegraph systems, especially for manually operated telegraph exchanges in which a switching process is triggered by the transmission initiated by an impulse on the telegraph line and by one over the line returning pulse is terminated, characterized in that circuit means are provided which the Switching process, if it is prematurely terminated, a faulty switching, z. B. by a new pulse would be sent until the incoming one arrives Delay the impulse. 2. Circuit arrangement according to claim i, characterized in that the circuit means from a known per se Capacitor resistor arrangement exist. 3. Circuit arrangement according to An-Spruch ι and 2, characterized in that that every relay that is triggered when a faulty switching is initiated by sending a Missing pulse would take effect, depending on the capacitor resistor arrangement is brought that it is at Einlei-. faulty switching is not influenced. 4. Circuit arrangement according to claim 1 and following, characterized in that that the relay that, when initiating a faulty circuit, sends out a Pulse is connected in series with the capacitor resistor arrangement, the capacitor being the slowly discharges through a resistor, previously charged in the sense, that the relay does not respond. For this purpose ι sheet of drawings