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66

MTM5400 Mobile Terminal Installation Manual

INSTALLATION

Figure 29  View of the Enhanced Control Head’s rear connectors 

Table 14  10-Pin Telco Connector

Telco Connector Pin

Function

Description

1

AUDIO +

Balanced Audio + (Bidirectional)

2

NC

Not Connected

3

BUS +

This is used for communication between the radio and an 

Enhanced Control Head.

4

AUDIO -

Balanced Audio - (Bidirectional)

5

NC

Not Connected

6

GND

Ground

7

Radio On/Off Control

This is the Enhanced Control Head service request input. 

A level of 5 volts indicates that the Enhanced Control Head 

needs to communicate with the radio. In addition it 

switches on the radio's voltage regulators. The idle state is 

a level below 0.6V.

8

SCI_TX

This if for communication between the radio and the 

Enhanced Control Head.

9

FLT_A +

This voltage is at battery voltage level and is available as 

long as the radio is connected to the supply voltage. The 

maximum current is 300mA. A fuse in the radio prevents 

further circuit damage in case of shorting this pin to 

ground.

10

Analog Ground

Analog Ground

1

13

1

10

14

25

10-Pin Telco Connector

25-Pi n Back Connector