Connecting extensions to the expansion units

106 Chapter 9 Connecting the cables to the BCM50 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” 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

1Read the warnings in “Wiring warnings” on page 103.

2Obtain a 25-pair cable with an RJ-21 connector on one end.

3Plug the RJ-21 connector of the cable into the RJ-21 connector on the front of the MBM.

4Select 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.

5Connect the other end of the cable to the telephone company demarcation blocks of the building.

6Select 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