Nortel Networks BCM1000 Benutzerhandbuch

Chapter 2 Telephony hardware

Installation and Maintenance Guide

The GATM was introduced with the BCM 3.0 software load. This module provides an interface to 
the telephone company analog lines for the Business Communication Manager. The module 
supports both pulse and tone dialing, Caller ID, and Supervision Disconnect in various markets.

In North America, this module supersedes the Caller ID Trunk module (CTM).

UK profile configuration note: The GATM does not support Earth Calling even though the option 
appears in the Unified Manager Lines record. Only a FEM connected to a Norstar analog trunk 
module supports this feature.

The figure below shows the front of the GATM module. Note that both the GATM4 and the 
GATM8 have only one amphenol connector. The firmware differentiates how many lines the 
connector supports.

Figure 16   GATM4/GATM8 module faceplate

Transmit Alarm

On indicates the DTM cannot transmit. The DTM sends an Alarm indication signal 
(AIS) to the terminating switch. This half-duplex link does not work.

Transmit Error

On indicates the DTM is sending a remote alarm indication (RAI) carrier failure 
alarm (CFA) to the terminating switch. If the Transmit Alarm is not on, this error 
indicates a far-end or cable problem.

All LEDS flashing

All LEDs flashing continuously indicates that the DTM is initializing.

TIP: You can install a maximum of three DTMs in the BCM1000 system, depending on 
the available bus blocks.
These modules must be installed in the BCM1000. If you already have three modules 
installed in the BCM1000, move one of those modules to the expansion unit to provide 
space for the DTM

Table 4   DTM LED functions  (Continued)

Power LED
Status LED
Amphenol 
connector