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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Nortel Networks BCM1000 manual Selecting the trunk media bay modules, Selecting the media bay modules for your system