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Appendix H 4x16 wiring charts 221
BCM50 Installation and Maintenance Guide
Appendix H
4x16 wiring charts
You can connect up to 4 analog telephone lines and up to 16 digital telephones to the 4x16 media
bay module (MBM).
The analog telephones lines are connected to the 4x16 through the RJ-11 jacks (labeled 1 to 4) on
the front of the MBM. Do not connect analog telephone lines to the auxiliary jack on the front of
the media bay module. These jacks are intended for analog telephones designated as emergency
telephones. See Figure 86.
The digital telephones, such as the Business Series Telephones, are connected to the RJ-21
connector on the front of the 4x16.
Figure 86 4x16 connectors
Table 45 and Table 46 on page 222 list the wiring details for the RJ-11 jacks on the 4x16. This
wiring applies to the numbered ports and the Aux ports.
Table 45 4x16 RJ-11 port wiring
Pin Signal
1 No connection
2 No connection
3Ring
4Tip
5 No connection
6 No connection
RJ-21 pin out
RJ-21 connector
4x16
6 5 4 3 2 1
RJ-11 pin out
RJ-11 jacks