Nortel Networks BCM200, 400 4.0 manual Determine trunk MBM requirements, GATM8

Chapter 8 Installing a media bay module (MBM) 107

2Use the number of lines and the number of lines per MBM to determine how many MBMs you need.

Table 25 Determine trunk MBM requirements

	Number		Number of lines	Number of MBMs
Type of lines	of lines	Type of MBM	per MBM	required
T1 digital lines		DTM	24	______ DTM
Universal T1 MUX digital		DDIM	24	______ DDIM
lines			(also requires a full
			DS30 bus for the data
			module)
PRI digital lines (NA)		DTM	23	______ DTM
E1 digital lines		DTM	30	______ DTM
PRI digital lines (EMEA)		DTM	30	______ DTM
Analog lines		CTM4	4	______ CTM
Analog lines		CTM8	8	______ CTM
Analog lines		GATM4	4	______ GATM
Analog lines		GATM8	8	______ GATM
Analog lines		4x16 combination MBM	4	______ CTM
			(also requires half of
			the next DS30 bus for
			the DSM16 part)
BRI ISDN lines		BRIM S/T	4 ISDN loops	______ BRIM S/T

For example:

•If you require 24 T1 digital lines, you need 1 DTM because a single DTM can handle 24 T1 lines (North America).

•If you require 2 analog lines and 24 T1 digital lines, you need 1 GATM4 and 1 DTM.

Note: Although the DTM supports several types of digital lines, you cannot connect different types of lines to the same DTM. You can add a maximum of three DTMs or DDIMs to your BCM system.

Tip: The BCM400 main unit holds a maximum of four MBMs. If you require more MBMs, the BCM expansion unit supports a maximum of six additional MBMs.

BCM200/400 4.0 Installation and Maintenance Guide