Nortel Networks BCM50 - Manual (Page 107)

Chapter 9 Connecting the cables to the BCM50 system 107
Installation and Maintenance Guide
9 Select the appropriate option for your system:
• If your BCM50 system has an expansion unit, proceed to Connecting telephone lines to
the expansion units on page 107 or Connecting extensions to the expansion units on page
108.
• If your BCM50 system has no expansion unit, proceed to Connecting the auxiliary
equipment on page 109.
For detailed information about wiring the RJ-21 telephony connector, see RJ-21 telephony
connector wiring chart on page 203.
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 Wiring warnings on page 105.
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 connect telephone lines to a 4x16 or BRIM, repeat steps 2 to 4 for each line.
6 Select the appropriate option for your system:
• If you connect a 4x16 MBM, go to Connecting extensions to the expansion units on page
108 for instruction about wiring the extensions for this MBM.
• If your BCM50 system has another expansion unit, repeat this procedure if you add more
telephone lines, or proceed to
Connecting extensions to the expansion units on page 108 if
you add extensions.
Warning: If the network ISDN is a U-loop, you must connect the BRIM 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.