SU467493A1 - Automatic telephone station marker - Google Patents

Description

is an individual coincidence circuit 6, in which the occupation signal from its corresponding set 3 enters the base of transistor 11 due to the closure of contact 12 of the occupation relay relay (the relay is not shown in the drawing). The emitter of transistor 11 is connected to the collector of transistor 13, which corresponds to the output of scanner 2 corresponding to this set. The output circuits of scanner 2 connected to sets 3 included in the MKS 4 are switched by means of switch 7 through the collector-emitter circuit of its transistor 14, which , in turn, is controlled through the transistor 15 by the contact 9 of the operation control relay MK.C 4 (the relay is not shown in the drawing). The output circuits of the scanner 2 connected to the sets 3 included in the MKS 5 are switched with the help of the switch 8, which is controlled by the contact 10 of the monitoring relay of the operation of the MKS 5 (the relay on the drawing is not shown).

In the initial state, the transistors 14 and 15 are open, and the transistor 11 is in the closed state. When the scanner 2 sets 3 are sequentially bypassed, a zero potential periodically appears at its outputs through the collector-emitter circuit of transistor 14, i.e., transistor 13 of the first scanner output opens periodically.

When a busy signal is received from the side of the set, the zero potential is applied to the base of transistor 11 via the contact 12 of the relay of the relay. When the busy signal coincides with the signal at the first output of the scanner, transistor 11 opens and a negative potential is supplied to the marker circuit, which is that call is accepted for service.

After the connection from the first set is established through the MKS 4, into which it is connected, the operation monitoring relay of the given MKS is activated and for the time of releasing its core by contact 9 prohibits the operation of transistors 14 and 15; the latter go to the closed state. From the scanner outputs corresponding to the kits included in the said ISS, zero potential is removed, and therefore, even if there is a call signal from any of these

sets, the latter are not serviced for a predetermined time. Calls coming from sets 3 included in the MKS 5 are accepted by the marker for service, since the corresponding outputs of the scanner 2 are still supplied with zero potential through the public key 8.

The present invention has been considered for the case of performing marker elements on transistors; however, they can also be built on other elements, for example, on thyristors, on integrated circuits such as DTL and TTL, etc.

Subject invention

An automatic telephone station marker containing a scanner, the inputs of which are connected to the control contacts of the operation control relay, characterized in that, in order to increase reliability by eliminating double connections, key elements and individual coincidence circuits are introduced, while the key inputs elements are connected to the control contacts of the operation control relay, and the outputs are connected to the scanner inputs, the inputs of the individual matching circuits are connected to the outputs of the scanner, and the outputs of the individual circuits

matches are marker outputs.

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