Operation of one telephone with caller ID on parallel lines. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Operation of one telephone with caller ID on parallel lines. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Telephony

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It is no secret that when two telephone sets are connected to one telephone line, their users face a number of inconveniences. Especially if parallel devices are installed in different apartments. The main problem lies in the fact that when a call is received, it is difficult to determine which subscriber is being called.

You can get rid of this inconvenience if you install a telephone with caller ID (CALL) on one of the two parallel lines, which has voice duplication of the call. A two-wire line must be drawn to another apartment, to which a dynamic head must be connected. By connecting this line in parallel with the regular dynamic head of the phone with caller ID, the owners of the devices will be able to hear information about incoming numbers and pick up the phone when they call one of them.

Of course, if the number on the display is not determined or the caller is unfamiliar to one of the subscribers, you will have to use the method known to all owners of parallel phones, that is, say: "Please call back again."

Typically, a phone with caller ID works in the "auto-pickup" mode of the handset. If you do not set the mode in which the caller ID skips several calls before "auto-raising", then another parallel device, at best, will make one ring and fall silent. The application of the described refinement allows you to immediately determine the number and broadcast a voice message and a call to a neighboring apartment.

In practice, the connection of an additional dynamic head fully proved the feasibility of the proposed idea. Using a parallel telephone has become much more convenient and pleasant (the author used AON with the Rus-22 software version).

Author: V. Gavritenko, Krasnoyarsk

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