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Appendix E DTM wiring chart 213
BCM50 Installation and Maintenance Guide
Appendix E
DTM wiring chart
The digital telephone line is connected to the Digital Trunk Module (DTM) through the RJ-48c
jack on the front of the media bay module (MBM) (see Figure 83).
Figure 83 DTM RJ-48C port
Table 39 and Table 40 list the wiring details for the RJ-48C port.
Table 39 DTM RJ-48c port wiring
Pin Signal
1 Receive Ring
2 Receive Tip
3 Receive Shield
4 Transmit Ring
5Transmit Tip
6 Transmit Shield
7 No connection
8 No connection
Table 40 DTM line numbering
Line type
Default line numbers on
Expansion port 1
Default line numbers on
Expansion port 2
T1 065 – 088 095 – 118
PRI 065 – 087 095 – 117
E1 065 – 094 095 – 124
1 2 3 4 5 6 7 8
RJ-48C jack
RJ-48C pin out
DTM
Bantam jack