BCM-50 Trunk Module Wiring
GATM4/8 Media Bay Module Amphenol Wiring
- GATM4 (NT5B44B) supports 4 analog trunks: L1 to L4
- GATM8 (NT5B44A) supports 8 analog trunks: L1 to L8
Trunk Modules are compatible with the BCM 200/400/450 Main Units, and BCM 50/400/450 Expansion Units.
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 set to AUX (pair 25). This set is only active during a power failure, when it's connected directly to L1.
The default line numbers indicated below apply when a trunk module is used in 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. | |