SU98242A1 - Field PBX subscriber lines - Google Patents

Description

The subject matter of the invention is a field of subscriber lines of automatic telephone exchanges.

In the well-known PBX systems, all subscriber lines of this group are included in the field of subscriber line searchers (call seekers and linear searchers), as a result of which the size of the JULY of these searchers and their cost are relatively large, especially in the PBX relay system, where the searcher field consists of a relay.

The proposed field of seeker subscriber lines operating according to the method of including subscriber lines of variable composition in the field of searchers makes it possible to better use the searchers and reduce their number.

For this purpose, several different groups of subscriber lines are connected to each searcher, and several different searchers are connected to each group of subscriber lines.

FIG. 1 shows a skeletal diagram of a field of seekers; in fig. 2 is a schematic diagram of the starting circuits of subscriber line searchers.

The positions 1, 2, 3, 4, 5, 6, 7.8, 9, and 10 in FIG. 1 denotes dozens of subscriber lines, and the positions //, 12 ... up to 30 are subscriber line searchers. Each searcher is available to several “ten subscriber lines — in this example, two. The numbers of these tens vary, for example, the // finder is available to subscriber lines 7 and 2 tenths, 12 the finder to subscriber lines m 2 m 3 tenths, etc.

FIG. 2 positions 2, 3 ... up to 10 indicate starting wires from the corresponding ten subscriber lines, and positions //, 12 ... up to 30 indicate the contacts of the control relays of the corresponding searchers, noting that this searcher is not occupied (the windings of these relays are not shown in the diagram). The control relay contacts of the searchers, located horizontally, form a starting chain for subscribers of the corresponding ten, denoted by / 7, P ... to Yaya.

The device shown in FIG. 1 and 2, works as follows.

If, for example, a call occurs in the first ten subscribers (Fig. 1), then the starting potential from the ten-day relay (not shown) comes to the starting chain P (Fig. 2). When the searcher 11 (Fig. 2) is idle, the contact // of its control relay switches to the upper position and the incoming trigger signal is transmitted to the searcher 11.

In that case, if the specified finder was taken, the start signal would go to the finder 21 through the closed lower position of the contact 11, the working upper position of the contact 21 (Fig. 2).

Similarly. to this method, incoming calls from other ten subscriber lines are served by seekers, whose numbers and sequence are shown to be relevant, by their starting chains P, Yaz ... to Yayu (Fig. 2).

When a call comes in from the second subscriber, the searcher 11 services this subscriber last of all when the searchers 12, 22, and 30 of the start chain Yag are busy (Fig. 2).

By the same principle, each searcher has access to two dozens of subscribers: one ten in the first place, to the other ten, with other searchers listed in the corresponding, her start-up chain, later (Fig. 2).

Subject invention

Field of PBX subscriber lines, characterized in that in order to reduce the number of searchers, several different groups of subscriber lines are connected to each of the searchers, and several different searchers are connected to each group of subscriber lines.

FIG. one

FIG. 2