KX-TDA1180X (serv.man3) - Panasonic PBX Service Manual (repair manual). Page 8

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• EC bus Interface

16bit/8MHz two-way address data multiplex self-bus (communication bus with MPR)

• CT bus Interface

Supports eight of 8.192MHz highway (128 timeslot) (voice communication bus with MPR)

• Local  TSW

Timeslot switching between CT bus (1024ch) and local highway (64ch)
(Timeslot switching between the voice communication bus in MPR and that in the circuit board)

• Local Gain Control

Gain control of the local highway up-down 64ch by 1dB/step randomly

• GPIO Interface

A parallel interface that can be set in random interactively
Refer to IC3 (ASIC) (P.52).