Chapter 3 - Installing Extensions and TrunksChapter 3 3 - 5SECTION 3-4INSTALLING CABLES3.4.1 Installing Extension Cross-Connect BlocksIt 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, anddetermine 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 devices3.4.2 Installing Trunk Cross-Connect BlocksIt 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, anddetermine 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
