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KX-TDA6178
5.2.10. Surge Protection
Thyristor is installed between T or R and FG protect from extraneous surge.
5.2.11. Self-Diagnosis
A self-diagnosis relay (RL201A) is installed in A port. In the normal operation mode, it breaks the self-diagnosis relay, and in the
self-diagnosis mode, it makes the self-diagnosis relay. In the self-diagnostic mode, A Tip-Ring is connected to the paired Tip-Ring of
the outside-line card via backboard, and self-diagnosis is feasible.
The self-diagnosis of the outside-line card includes outside call pick up, dial pulse transmission, DTMF transmission, BELL recep-
tion and CPC detection.
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