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8.5. DTMF SIGNAL DETECTION
Each port has its own 4ch-DTMF receiver. The receiver detects the signal using IC1 for port A
through D, IC2 for port E through H, IC4 for port I through L and IC6 for port M through P. The
CODEC detects the DTMF data to be effective at EST terminal=H. This information is detected in
the MPR via SAMSON, then DTMF signal is detected by MPR reading the DTMF receiver data
that came through the SAMSON local bus.
8.6. POWER SUPPLY
A constant-current power supply in HIC provides +30V, ring side 0V grounding to SLC. The
maximum feeding current is 30mA.
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