SU94964A1 - PBX call seekers field - Google Patents

Description

This invention relates to the field of automatic telephone stations with call searchers.

In the existing PBX systems, all the subscribers of this group are included in the call seekers field, as a result of which the dimensions of the call finders and their cost are relatively large, especially in the PBX of the relay system, where the call seekers field consists of a relay.

The proposed field of call finders that work but with the step-wise method is smaller and more expensive than the well-known finders.

For this purpose, zero call crawlers are made up of small capacity call seekers fields available to individual subgroups of subscribers, and collective reserve crawlers fields that connect to a subscriber of one or another group while all individual small capacity seekers in this subgroup are involved.

FIG. 1 shows a skeletal diagram of the gender of the seekers; pas figs. 2 is a schematic diagram of the starting circuit of the call finder.

The numbers 1,2,3,4,9 and / 0 (Fn. 1) designate the control sets of small-capacity call seekers available to individual subgroups of subscribers: the searchers / and 2 are available to subscribers 1-20, the searchers 5 and 4 to subscribers 21-40 etc., the searchers 9 and 10 are available to subscribers 81-100.

The control sets of collective backup searchers P and 12 calls have a capacity of 100 numbers each and are available to all subgroups of subscribers / --100 numbers.

A call originating in a subgroup is served by one of the low-capacity call finders assigned to that subgroup. If the individual searchers are busy, the call is directed to one of the collective backup finders // or 12.

FIG. 2, to the left of the vertical dashed line, a portion of the call distributor scheme is shown, and to the right of this line, the diagram shows the pins of individual and collective call finders.

Here are marked: D, D. ,,. . . DK) -control relay contacts in the call distributor circuit;

Al, Aj

. Aj2 - relay contacts.

marking the absence of a given call finder; K, K . . 12-relay coils in the circuit of the call finders performing the connection of the call finders.

The start-up contact Aj-xYis contains a branch of the connection of individual call finders and a number of subscribers and a common unbranched AC-X segment corresponding to the connection of collective backup finders.

The scheme works as follows.

If, for example, a call arises in the subscribers' iodrunk (the first or second ten), then the ten relay D1 or Yes is triggered and with its contact supplies the positive potential to the first branch of the starting chain. If the searcher is free, then relay X, not shown in the diagram, will work, its contact X will switch and the positive potential from the DK or Dz contact will go to the relay K-winding, which will work and the searcher will take L If this searcher was taken, then positive potential.

through the contact Ioko A, and the working contact X. (if the searcher is not busy) enters the relay La and then searcher 2 of the first subgroup will be occupied.

If both searchers of the nerve subgroup are occupied, then the positive potential enters one of the free collective reserve seekers 11 or 12 through the contacts X, X and the working contacts Lp or A, 2. In the same way, the positive potential enters the collective backup finder when individual individual seekers of calls from other subgroups are busy.

Subject invention

The field of PBX call seekers operating according to the stepwise switching method, characterized in that, in order to simplify the field, it is composed of the fields of low-capacity call seekers available to individual subgroups of subscribers and collective zeros

backup searchers who are connected to a subscriber of one group or another when all individual small-capacity seekers are busy in this subgroup.

FIG. one

i-20t1- S1-100

D

iZ

A4-4

 l

FIG. 2