KX-NCP1170XJ (serv.man2) - Panasonic PBX Service Manual (repair manual). Page 8

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• APT data communications

Control data is transmitted from the DTL terminal of ASIC, then is output to APT (between D1 and D2) by way of the driver U5
and the pulse transformer T1.
The control data transmitted from APT is input to the DR terminal of ASIC by way of the pulse transformer T1 and R13. ASIC
compares VREF+ with the input waveform, and receives a valid pulse.

• DPT data communications

Bch/Dch/Cch data is transmitted from the DTL/DTH terminal of ASIC, and the AMI-converted pulse signal is output to DPT
(between D1 and D2) by way of the driver U5 and the pulse transformer T1. The Bch/Dch/Cch data transmitted from APT is input
to the DR terminal of ASIC by way of the pulse transformer T1 and R13. ASIC compares VREF+ and VREF- with the input wave-
form, and receives a valid pulse.

• Bch communications

Communicated by the PCM data (64kbps Å~ 2) connected from the local highway by ASIC.
Used mainly for the audio signal of DPT.

• Dch communications

Communicated by the data (16kbps) protocol-converted by the HDLC controller in ASIC.
Used mainly for the control signal of DPT.

• Cch communications

Communicated by the data (8kbps) converted by the serial/parallel-converting circuit in ASIC.
Used mainly for recognizing the terminal model.