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KX-TDA6181X
7.2.10. Power Failure Port
At the time of the power failure, for enabling a direct call to the extension phone, 4lines out of 16lines can be connected to the SLT
port, which provides a switching relay for power failure on the extension card, by a cable. It connects CN3, CN4 with the connector
for power failure on the extension card.
7.2.11. Self-Diagnostic Relay
Self-diagnostic relays are mounted on each port. It enters normal mode at DIAG=L, and enters self-diagnostic mode at DIAG=H.
At the self-diagnostic mode, Tip-Ring connects to Tip-Ring being in the pairing extension card via the backboard. That allows self-
diagnostic feature to be performed.
The items of self-diagnosis for ELCOT16 circuits are BELL signal detection, line addition, dial pulse transmission and DTMF
transmission.
7.2.12. Option Cards
The following Option cards can be mounted :
1) 2 x Caller ID Detection cards (CID8).
2) 2 x Caller ID / Paytone Detection cards (CID/PAY8).
7.3.
POWER SUPPLY CIRCUIT
• • • • DC/DC conversion circuit
The circuit which generates output +3.3V, +5V with input +15V. It is configured with the circuit that reduces the voltage from
+15V to +3.3V by IC1, Q1 and L31 switching power supply, and with the circuit that reduces the voltage from +15V to +5V by
IC2, Q2 and L32 switching power supply.
There are some protection lines. First is IP2 for +3.3V short protection, second is IP3 for +5V short protection, third is the
overvoltage protection which detects +3.3V/+5V excess voltage rise and makes the FET(Q6) turn ON which blows IP1.
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