Mike's PBX Cookbook

BCM-50 Trunk Module Wiring

GATM4/8 Media Bay Module Amphenol Wiring

Use the table below if connecting analog trunks to a GATM4 or GATM8 Media Bay Module. Note the "punch two, miss two" scheme.
Optionally, connect an analog station to AUX (pair 25). This set is only active during a power failure, when it's connected directly to L1.

Trunk Modules are compatible with the BCM 200/400 Main Unit, BCM 400 Expansion Unit, BCM 450 Main Unit, BCM 450 Expansion Unit and BCM 50 Expansion Unit. The default line numbers indicated apply when these trunk modules are used with a BCM50 Expansion Unit.

Line Pin Pair Colour Expansion Port 1
Default Line Numbers
Expansion Port 2
Default Line Numbers
L1 26/1 White/Blue 65 95
L2 27/2 White/Orange 66 96
- 28/3 No connection
- 29/4    "
L3 30/5 White/Slate 67 97
L4 31/6 Red/Blue 68 98
- 32/7 No connection
- 33/8    "
L5 34/9 Red/Brown 73 103
L6 35/10 Red/Blue 74 104
- 36/11 No connection
- 37/12    "
L7 38/13 Black/Green 75 105
L8 39/14 Black/Brown 76 106
- 40/15 No connection
:    "
- 49/24    "
AUX 50/25 Violet/Slate Optional analog set. If power fails, the set connects to L1.

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