Refinement of imported telephone sets. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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It is proposed to improve the calling part of imported telephone sets ("FeTap", "Siemens", "TriTel", "Philips") and their adaptation to coordinate exchanges. On the automatic telephone exchange of the coordinate system of the ATSK-100/2000 type, with a ringing signal (ringing), these devices either do not ring at all, or slightly “ring” during the action of the inductor voltage. It turned out that if the frequency of the "inductor" is below 30 Hz, these devices do not ring. And the frequency of the inductor at ATSC is 25 Hz.
When studying the calling part of the TA, it turned out that all these devices contain a calling chip of the SAA1092-2 type or its analogue from Telefunken U4076B.
On the automatic telephone exchange of European countries, the frequency of the inductor is 50 Hz. The microcircuit contains the function of switching the frequency of the received ringing signal (up to 30 Hz and above 30 Hz).
In the telephone set, these microcircuits do not use pin 1, which corresponds to a ringing frequency of 50 Hz. When finalizing the TA, the author connected pin 1 of the microcircuit with pin 4 (common wire). After that, the device began to call normally at any time and to any PBX of the coordinate system.
The author has modified more than 30 devices, and they all work fine.
On the diagram of the calling part of the TA, the refinement is the SA2 button. When the button is open, the TA works with an inductor with a frequency of more than 30 Hz, and when it is closed - less than 30 Hz.
Author: I. Shmorgun; Publication: cxem.net
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