User Guide

Technical Documentation
Mobile Base MCH–8
Page – 4
Original 50/96
Technical Specification
Modes of Operation
When handportable is in the MCH–8 holder unit audio signals turn to
junction box and rf signal to booster or mobile antenna. Also battery of
handportable is charged by junction box through MCH–8.
External Signals and Connections
Mobile base module DH1 has two external connectors, the handportable
connector X101 and the junction box connector X102. It also contains one
RF connector to connect RF signal/signals to car antenna.
Junction Box Connector X101
Pin: Name: Function:
1 BIND
2 GND Ground for charger
3 M2BUS Serial mbus data between handportable,
accessories and junction box
4 VC Supply voltage/charging current for
handportable 12 V ±1 V or 800 mA ±70 mA
5 SHIELD Cable shield, connected to GND
6 AGND Signal ground
7 XMIC/JCONN Audio signal from junction box to hand
portable, d.c. level indicates connection of
junction box to handportable
8 XEAR/HFPWR Audio signal from handportable to junction box,
current sink from this pin to handportable turns
on +5 V supply voltage in junction box
Handportable Connector X100
Pin: Name: Function:
1 GND Logic ground, ground for charger
2 XMIC Audio signal from junction box to handportable,
d.c. level indicates connection of junction box
to handportable
3 AGND Signal ground
4 TDA NC