Nortel Networks BCM200/400 - Manual (Page 109)

Chapter 8 Installing a media bay module (MBM) 109
BCM200/400 4.0 Installation and Maintenance Guide
2 Use the number of lines and the number of lines per MBM to determine how many MBMs you
need.
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.
Table 25 Determine trunk MBM requirements
Type of lines
Number
of lines
Type of MBM
Number of lines
per MBM Number of MBMs
required
T1 digital lines DTM 24 ______ DTM
Universal T1 MUX digital
lines DDIM 24
(also requires a full
DS30 bus for the data
module) ______ DDIM
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
(also requires all of
the next DS30 bus for
the DSM16 part) ______ 4x16
Analog lines 8x16 combination MBM 8
(also requires all of
the next DS30 bus for
the DSM16 part) ______ 8x16
BRI ISDN lines BRIM S/T 4 ISDN loops ______ BRIM S/T
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.