DE1003277B - Circuit arrangement for switchboards equipped with a conversation timer in telephone systems with pulse indicators - Google Patents

Description

GERMAN

In telephone systems in which the feedback on the operating status is given in the form of impulses as so-called impulse indicators, the control of the optical signals at operator stations causes difficulties because the lamps controlled by the feedback receiving relay are only switched on for the duration of the message impulse and therefore light up for a short time that the operator easily overlooks the lighting up. It is known to equip an auxiliary relay controlled by the feedback relay with a dropout delay so that it converts the final signal, transmitted as a flicker signal by means of periodic impulses, into a permanent state by continuously tightening its armature. In the known arrangements of this kind the switch-off is of the during a call connection-switched call timer with receipt of the first clearing signal pulse assured ¹ therethrough. With these systems: but it can easily happen that the operator overlooks the brief lighting up of the tail lamp upon receipt of the signaling impulse that marks the beginning of the conversation and therefore neglects the action required to switch on the conversation timer.

The invention aims to provide a remedy here and to improve the signaling at the start of a conversation, so that the operator will switch on the call timer with certainty. Particularly intended the invention with simple means and without the need for additional components, the circuit of Operator stations, which worked securely in telephone systems with permanent registration, for the changeover to make the system suitable for impulse indicators. The invention achieves this in one Circuit arrangement for switchboards equipped with call timers in that a the call timer associated warning lamp from the feedback relay and one of this downstream auxiliary relay depends on which one is used to convert the transmitted as a flicker signal End signal message is equipped in a permanent state with dropout delay, so that upon receipt of the short signaling impulse at the start of the conversation, the lamp is clearly perceptible to the operator Signs to turn on the conversation timer there. The invention thus uses the known Arrangements available warning lamp as well as the existing delay device for the Auxiliary relay off for the duration of the auxiliary relay to switch on an alert at the start of the conversation. The officer will not overlook this sign. Only one contact of the auxiliary relay is required here Circuit arrangement

for attendant consoles in telephone systems equipped with a call timer

with impulse indicator

Applicant:
ίο Friedrich Merk,

Telefonbau Aktiengesellschaft,
Munich, Warngauer Str. 32

Leonhard Rofler, Munich,
has been named as the inventor

to be changed compared to the known circuit. An inevitability can be particularly advantageous the operating mode can be achieved in that the auxiliary relay is switched on at the same time The lamp also closes a holding circuit, which is dependent on the operating switching means of the place, which turns on the talk timer. the The lamp then lights up until the officer switches on the call timer and the Holding circuit interrupted.

An embodiment of the invention is shown in the drawing. This schiematically shows the essential current flows of the connection device of an attendant console.

The connection device is equipped in the manner of a two-cord system with an interrogation plug AST and a connection plug VST. By actuating an interrogation switch AS , the speech device SE is connected to the interrogation plug and the connecting plug. The calling line is connected to the jack KA. The latch KB is connected to a continuing line, not shown, which leads to an exchange equipped with voters.

Relays SA and SV are located on the speech line and can receive messages transmitted via the speech wires. The relay SA controls a tail lamp SLA by means of the contact sa2 , and the relay SV controls a tail lamp SLV with contact sv2.

As soon as the officer inserts the interrogation plug AST into the latch KA on the basis of a call; relays CA and D energized. The officer) asks

, 609 837/145

the request of the calling subscriber then leads the. Plug VST into the jack KB of the continuing line and set the dialer of the switching center to the desired subscriber in a known manner, not shown in detail. If the desired participant reports, the officer must flip the switch AN and prepare a circuit for a conversation timer GZM via the contact ANl, which is periodically closed by the contact η 10 of a timer. As a result, the time spans in which the contact η 10 is closed, for example time segments of 10 seconds each, are counted and displayed by the conversation timer GZM during the conversation. * 5

This circuit of the conversation timer GZA / runs via a contact g of a relay G, which is actuated when the final signal is received. In the voter exchanges with pulse codes, the final signal is given in pulses by applying the two battery poles to the voice line until the voters are triggered on the basis of a measure by the operator. These flickering pulses cause the final signal relay SV to respond periodically, so that it closes the circuit of the relay G in pulses by means of the contact sv 1. A resistor W1 is connected upstream of the relay G , and a capacitor C is connected in series with a resistor W2 in parallel. As a result, the fall of the relay G is delayed before its excitation circuit is interrupted, and it holds its. Armature tightened until contact cv 1 closes again. For the duration of the final signaling, the contact g is therefore opened and thus the circuit of the conversation timer is interrupted. The officer recognizes by the flickering lighting up of the tail lamp SLV that the called subscriber has ended the call. She can read the call timer and make the usual notations.

In order to ensure that the officer switches on the conversation timer by means of the switch AN at the start of the conversation, the contact g of the relay G is designed as a changeover contact, which closes a circuit for an attention lamp L via its right side. In the voter systems with impulse indicators, both poles of the battery are briefly connected to the speech wires once, as soon as the desired participant reports »I. The feedback relay SV therefore responds briefly once and energizes the auxiliary relay G. This closes the circuit of the lamp L for the duration of its drop-out delay. So while the final signal lamp SLV flashes only once when the relay SV briefly responds under the influence of the impulse of the start message, the lamp L remains switched on at G and gives the officer an indication that cannot easily be overlooked. In the illustrated embodiment, on the office side of the contact g in addition to the circuit for the lamp L at the same time a. Holding circuit for the relay G closed, which runs via the contact AN 2 of the switch ^ V, which the officer must operate to switch on the conversation timer. As a result, the warning lamp L remains on until the officer presses the switch ON . Relay G is only thrown off by actuating the switch AN , thus closing the circuit of the call timer. This forces the officer to switch on the conversation timer at the beginning of the conversation. When relay G drops out, the lamp circuit is interrupted and it goes out. After a conversation of 3 minutes, the conversation timer activates a contact sk, which again closes a circuit for the lamp, so that the ^first officer becomes aware that the tariff level has been exceeded.

Claims (4)

PATENT CLAIMS: 1. Circuit arrangement for switchboards in telephone systems equipped with a call timer with pulse indicators, characterized in that a warning lamp (L) assigned to the call timer is provided by the feedback relay (SV) and a downstream auxiliary relay (G), which is used to convert the flaekerzeiichen ül> end signal endured message is equipped in a permanent state with dropout delay, so that when the short message pulse is received at the start of the conversation, the lamp (L) gives the operator a clear, perceptible signal to switch on the conversation timer. 2. Circuit arrangement according to claim 1, characterized in that the auxiliary relay (G) closes one of the operating switching means [AN) of the space dependent holding circuit in which the lamp (L) is switched on. 3. Circuit arrangement according to claim Iund2, characterized in that the auxiliary relay (G) switches on the conversation timer (GZM) when it drops as a result of actuation of the operating switching means (AN) of the place. 4. Circuit arrangement according to claim 1 to 3, characterized in that the circuit of the conversation timer (GZM) is dependent on the rest position of the interrogation switch. Documents considered: German Patent No. 876 258; H. Goetsch, pocket book for telecommunications at least for the duration of the fall delay of the Reniker, 1943, p. 139. 1 sheet of drawings © 609 837/145 2.