To Connect Telephone Lines To Dtm, Brim, Or 4X16 Mbms; Connecting Telephone Lines To The Expansion Units - Nortel BCM50 Installation And Maintenance Manual

8 Connect the 12 pairs of wires for the digital telephones to the local connecting blocks.
9 Select the appropriate option for your system:
• If your BCM50 system has an expansion unit, proceed to
the expansion units"
• If your BCM50 system does not have an expansion unit, proceed to
auxiliary equipment" on page
Refer to the "RJ-21 telephony connector wiring chart" on page 205
wiring the RJ-21 telephony connector.

Connecting telephone lines to the expansion units

Telephone lines connect to the expansion unit through the connectors on the MBM installed in the
expansion unit.

To connect telephone lines to DTM, BRIM, or 4x16 MBMs

1
Read the warnings in
2 Obtain a telephone cable that has a modular plug that matches the MBM to which you are
connecting:
• RJ-48C — for DTM
• RJ-45 — for BRIM
• RJ-11 — for 4x16
3
Plug the modular cable into the jack in the front of the MBM.
4 Connect the other end of the cable to the telephone company demarcation blocks of the
building.
5
If you are connecting telephone lines to a 4x16 or BRIM, repeat steps 2 to 4 for each line you
are connecting.
Warning: If the network ISDN is a U-loop, the BRIM must be connected only to an
NT1 provided by the service provider. The NT1 must provide a Telecommunication
Network Voltage (TNV) to Safety Extra Low Voltage (SELV) barrier.
Note: Do not attempt to plug digital equipment into the auxiliary (AUX) jacks on the
front of 4x16 MBM.
6 Select the appropriate option for your system:
• If you are connecting a 4x16 MBM, go to
on page 106
Chapter 9 Connecting the cables to the BCM50 system
or "Connecting extensions to the expansion units" on page
107.
"Wiring warnings" on page
for instruction about wiring the extensions for this MBM.
"Connecting telephone lines to
for detailed information about
103.
"Connecting extensions to the expansion units"
BCM50 Installation and Maintenance Guide
105
106.
"Connecting the