Nortel Networks BCM1000 manual Selecting the trunk media bay modules

58Chapter 4 Selecting the media bay modules for your system

Selecting the trunk media bay modules

The number and type of lines coming into your system determine which trunk media bay modules, and how many modules, you require to support your needs. Trunk lines come from either the public network (PSTN), or they support connections in a private network.

If you are setting up an entirely new system, a site survey must be done to determine your current and future needs. We recommend that you do the survey before you order any modules.

Note: If you plan to add any lines in the near future, include them in your initial estimates.

To select the trunk media bay modules:

1Record the number of each type of line you have in Table 7.

If you do not know the number or type of lines you have, contact your service provider.

2Use the number of lines and the number of lines per module to determine how many modules you need.

Table 7 Determining trunk module requirements

		Type of media bay	Number of lines	Number of modules
Type of lines	Number of lines	module	per module	required
T1 digital lines		DTM	24	______ DTM
PRI digital lines (NA)		DTM	23	______ DTM
(required for Companion
wireless)
E1 digital lines		DTM	30	______ DTM
PRI digital lines (EMEA)		DTM	30	______ DTM
Analog lines		CTM	4	______ CTM
		(North American
		systems only)
Analog lines		GATM4	4	______ CTM
Analog lines		CTM8	8	______ CTM
		(North American
		systems only)
Analog lines		GATM8	8	______ CTM
Analog lines		4X16 combination	4	______ CTM
		module	(also requires a
		(North American	full DS30 bus for
		system only)	the DNs)

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