Phone line protection. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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In cases where you want to protect yourself from unauthorized access to the telephone line in a simpler way, you can use the scheme shown in Fig. 1.This device blocks both dialing and ringing.
Ris.1
It is convenient to perform it in the form of a separate plug, connected instead of a telephone set (for example, when you are away for a long time).
Author: Bogachev Alexey, Perm; Publication: N. Bolshakov, rf.atnn.ru
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