3.13. SRU PC Board (Optional)
CN90
Refer to SC PC Board CN16.
CN91
SRU PCB
Signal Name
Pin No.
CN91-1
MIC (+)
CN91-2
RCV (+)
CN91-3
RCV (-)
CN91-4
MIC (-)
Destination
Telephone
Handset CN
Telephone
Handset CN
Telephone
Handset CN
Telephone
Handset CN
Signal Waveform
73
Function
Handset Microphone
Handset Receiver
Handset Receiver
Handset Microphone