| 摘要 |
1. Internal communication gate entry system commutator circuit, containing a gate entry phone, ring detector, monostable multivibrator, ring generator and commutator, characterized in that the entry phone (1) is connected via the ring detector (2) to the monostable multivibrator (3), which is connected via a gating circuit (6) to the coil of a relay (P), whose active contact (C) is connected to the first passive contact (B) or to the second passive contact (A), while the first passive contact (B) is connected to the entry phone (1) and the second passive contact (A) is connected to an input current sensor (7), which is connected to the gating circuit (6) and to the commutator (4) by one line (BLOKOWANIE), whereas the commutator (4) is connected to the gating circuit (6) by a second line (PODTZRYMANIE); in addition the input current sensor (7) is connected via the ring generator (6) to the active contact (C) of the relay (P) and to the input of the commutator (4), whose outputs are connected via lines (L1,...,Ln) to the speaking sets.<IMAGE>
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