DE340599C - Circuit arrangement for two-wire connecting lines between groups in telephone systems with automatic or semi-automatic operation - Google Patents

Description

Circuit arrangement for two-wire connecting lines between groups in telephone systems with automatic or semi-automatic operation. The circuit arrangement described in patent 273649 is based on the fact that for the purpose of transferring switching processes (checking for vacancy, occupation, counting) that take place within the group on cores not used for speaking, from one group to the other on both sides the cores of the group that are not used for speaking the switching operations are coupled with the connecting lines - during the course.

The invention relates to a further development of the basis of the main patent underlying idea and represents a particularly simple circuit arrangement. This simple circuit is achieved in that one wire of the connecting line at the incoming end with the line of the voter, which is only used for switching measures is coupled, while at the departing end to the same wire of the connecting line a potential is laid.

An exemplary embodiment of the invention is shown schematically in the drawing shown, with all parts illustrated in the rest state. Not necessarily necessary parts are omitted for the sake of clarity.

The preselector VW and the first group selector I. GW are set in a known manner. As soon as the test arm c of the first group selector I. GW has found the c-contact to a free connection line, the relays W and P respond: Battery, W, c-contact, c-arm, P, earth. Relay .P short-circuits its high-resistance winding via contact z, thereby occupying the connecting line. Furthermore, relay P switches through the line from preselector VW to the first group selector I. GW at contacts 2 and 3. The participant operates his dial and thereby influences relay A. According to the number of number current impulses given. Relay A closes its contact q. and transmits the number surges on the a-wire of the connecting line to the impulse relay J, which is subordinate to the second group selector II. GW supply. Relay I activates the selector II. GW. If the c-arm of this selector reaches a free c-contact, the relay P1 responds. To create this circuit, a potential via contact 13 of relay E is applied to the outgoing end of the b-wire of the connection. Relay PI switches the connection line through at contacts 6 and "7, holds itself via contact 8 and occupies the second group selector II. GW. Relay E, connected in series with this relay, was energized at the same time as relay P1. Relay E holds via its own contact 9, holding winding E and contact zo, which was closed by the response of relay W. Furthermore, relay E shorts the field winding at contact ii, opens contact 13, thereby switching off the potential at 13 and closing contact 12, whereby The other switching processes, such as setting the line selector, calling the desired subscriber, etc., take place in a known manner.

After the end of the call, the connection is terminated as follows: By hanging up the receiver at the calling subscriber station, relay A is de-energized. A opens contact 1q., So that V is de-energized and contact 16 closes. This closes the following circuit: battery, head contact 16 of the first group selector I.GW, M, contact i5, earth. The release magnet now attracts its armature. M triggers the first group selector I. GW, opens contact 17 and causes the relays T and C to drop out, which triggers the preselector VW . When the first group selector 1. GW is triggered, the relays P and W are de-energized. Relay W opens contact OK and causes relay E to drop out. The second group selector II. GW is triggered in some known manner.

Claims (3)

PATENT CLAIMS: i. Circuit arrangement for two-wire connecting lines between groups in telephone systems for automatic or semi-automatic operation according to patent 27364g, characterized in that one wire (a or b) of the connecting line at the incoming end with the cable that is only used for switching measures (c-wire) of the voter (I1. GW) is coupled, while. voter outgoing end to the same A potential is applied to the connecting line. 2. Circuit arrangement according to Claim i, characterized in that at the outgoing end of the connecting line a relay (E) is switched on in the coupled wire, which is the connecting line switches through when they are free at the outgoing end. 3. Circuit arrangement according to Claim i and 2, characterized in that one in the test circuit of the outgoing At the end of the connecting line, the voter is switched on after triggering the relay (W) the connection, the relay (E) in the coupled wire is in the rest position brings back.