Chapter 3 - Installing Extensions and Trunks
Chapter 3 3 - 5
SECTION 3-4
INSTALLING CABLES
3.4.1 Installing Extension Cross-Connect Blocks
It is recommended to install cross-connect blocks for each of the system's major extension port device groups.
Cross-connect blocks provide an easy way to troubleshoot, determine port identification numerically, and
determine port utilization.
Install cross-connect blocks for the following interfaces:
● All digital extension circuits
● CCPU functions (i.e.; BGM, MOH, relay 1)
● External page
● External alarms
● Data devices
3.4.2 Installing Trunk Cross-Connect Blocks
It is also recommended to install cross-connect blocks for each of the system's major trunk device groups.
Cross-connect blocks provide an easy way to troubleshoot, determine port identification numerically, and
determine trunk port utilization.
Install cross-connect from telco’s RJ21X to the trunk cross-connect blocks for the following:
● analog loop start lines
● analog ground start trunks
● DID trunks
● Tie lines
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