Telephone System Installation and Maintenance Guide

106 Chapter 9 Connecting the cables to the BCM50 system
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• If your BCM50 system has another expansion unit, repeat this procedure if you are adding
more telephone lines or proceed to “Connecting extensions to the expansion units” on
page 106 if you are adding extensions.
• If your BCM50 system does not have another expansion unit, proceed to “Connecting the
auxiliary equipment” on page 107.
To connect analog telephone lines to the GATM4 or GATM8
1 Read the warnings in “Wiring warnings” on page 103.
2 Obtain a 25-pair cable with an RJ-21 connector on one end.
3 Plug the RJ-21 connector of the cable into the RJ-21 connector on the front of the MBM.
4 Select the appropriate option to secure the RJ-21 connector to the MBM:
• If you are using a straight RJ-21 connector, use the two supplied screws on the sides of the
connector to secure it.
• If you are using a right-angle RJ-21 connector, use the supplied screw on the left side of
the connector to secure the left side of the connector. To secure the right side of the
connector, use the supplied cable tie to fasten the 25-pair cable to the anchor on the MBM.
5 Connect the other end of the cable to the telephone company demarcation blocks of the
building.
6 Select the appropriate option for your system:
• If your BCM50 system has another expansion unit, repeat this procedure if you are adding
more telephone lines or proceed to “Connecting extensions to the expansion units” if you
are adding extensions.
• If your BCM50 system does not have another expansion unit, proceed to “Connecting the
auxiliary equipment” on page 107.
Refer to the following sections for information on wiring the trunk MBMs:
• “DTM wiring chart” on page 213
• “BRIM wiring chart” on page 215
• “GATM wiring chart” on page 217
• “4x16 wiring charts” on page 221
Connecting extensions to the expansion units
Extensions connect to the expansion unit through the connectors on the MBM installed in the
expansion unit.
To connect extensions to DSM16, DSM32, ASM8, or 4x16 MBMs
1 Read the warnings in the “Wiring warnings” on page 103 section.
2 Obtain a 25-pair cable with an RJ-21 connector on one end.
3 Plug the RJ-21 connector of the cable into the RJ-21 connector on the front of the MBM.