13.2 Line Interface
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In talk status, L1 RLY output from pin 25 of IC801 changes to low level, causing Q103, Q101 to turn on
and resulting in a line loop.The loop current flows from D101(+) → Q101 → Q108 → R124 → D106in
that order, A pulse signal that repeated switches between high and low logic is output from pin 26 of the
CPU.This switches the line loop on and off, generating the dial pulse signal.
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