DE1149409B - Circuit arrangement for telephone PBXs - Google Patents

Description

Circuit arrangement for telephone private branch exchanges The invention relates to a circuit arrangement for telephone private branch exchanges in which only a certain number of those leading to further telephone branch exchanges single directional cross-connection lines may be used at the same time.

Such circuit arrangements are, for. B. in the telephone systems of the energy supply company (EVU) possible. These telephone systems are Extension and operating systems are very often set up in the same racks. Since the cross-connection lines running between the two systems are subject to charges are limited in the number of lines. While with spatially distant PBXs The cross-connection lines enable double-directional operation and with transmissions are completed, turns out to be in these spatially combined systems such mode of operation as too expensive. It's more convenient here, just simple to use directional lines. It must then be ensured that the The number of connections possible at the same time is correspondingly limited.

There are known circuit arrangements in which, after an occupancy certain number of trunk locking switching means are switched on, which the Prevent the seizure of another exchange line in the outgoing direction. One embodiment of this type is such that switching means are effective when all the trunk lines are occupied which prevent the seizure of another trunk line until a certain number of trunks, e.g. B. 20%, are unlocked again.

In another known arrangement for telephone systems with dialer operation and connection traffic between private branch exchanges, in the case of occupancy of a certain number of certain lines further connections via further lines are prevented, an indicator is assigned when any line is occupied given into a common counter and thereby incremented a counter. In a certain position of the counter a further assignment of the still wiz'd free connection lines prevented. Accordingly, a Line of the counter switched back. In this arrangement there is a counting device provide that counts both forwards and backwards and at a certain Position of the counter affects all occupancy groups of the lines.

The invention is based on the object of creating an arrangement in which the same result is achieved with simpler and less expensive means will. This is achieved according to the invention in that the cross-connecting lines to mixed, e.g. B. outgoing, incoming cross-connection lines and inquiry lines Containing groups are summarized and the number of groups of the number of simultaneously to be used cross connection lines and that in the assignment cores of the lines switching means are inserted, which when actuated an assignment of the prevent other cross-connection lines in the same group.

The invention is now based on the embodiment shown in the figure explained in more detail. In the figure, only the details are shown, which are necessary for understanding of the invention are necessary.

In the embodiment it is. the interconnection of an NStAhl private branch exchange. A with an operating system NStAnl. B of an energy supply company (EVU). Both systems can be connected to one another via cross-connection lines combined into groups. In the exemplary embodiment, two incoming, two outgoing and one inquiry lines are combined to form a group and only this one group is shown. Depending on the existing lines and the number of connections permitted at the same time, any other grouping is also conceivable. If the subscriber wants Tln 1 with a subscriber of the operating system NStAnl that can be reached via the transmission Ue 1. B speak, after dialing number 8, the first group selector LGW is set to the eighth decade and looks for a free line. When this line is occupied, relay G 1 responds. It interrupts with its contact g11. . . g14 the other assignment cores of this group. After the corresponding setting of the second group selector II.GW, the transmission Ue 1 is occupied.

During a consultation call, the transmission U 1 is known in and therefore, in a manner not shown, the inquiry call seeker RS of an inquiry line in a free. Group stimulated. In the assignment line of this inquiry line responds to the relay R, which with its contacts r 1.. . r 4 the occupancy lines the other lines in this group.

Accordingly, the remote group selector FGW z. B. set to the height step 3. In leading the line selector LW Assignment Wire is the relay K 2. After setting the line selector LW, the subscriber can then TDH3 be achieved. The relay K 2 separates with its contacts k 21 ... k 24 the occupancy wires of the other lines.

With this arrangement, each line is only in the seizure core a relay is necessary, its normally closed contacts in the occupancy wires of the other lines are in the same group.

Claims (1)

Claim: Circuit arrangement for telephone private branch exchanges in which only a certain number of the single-directional cross-connecting lines leading to further telephone private branch exchanges may be used at the same time, characterized in that the cross-connecting lines are mixed, e.g. B. outgoing, incoming cross-connection lines and inquiry lines containing groups are combined and the number of groups corresponds to the number of cross-connection lines to be used at the same time and that switching means (G1, G2, K l, K2, R) are inserted into the occupancy wires of the lines, which at Press to prevent the other cross-connection lines in the same group from being used. Documents considered: German Auslegeschrift No. 1095 323.