Nortel Networks BCM1000 manual CTM/GATM switch settings

Chapter 7 Setting media bay module DIP switches 93

CTM/GATM switch settings

There are two models of CTMs/GATMs.

•CTMs/GATM4s have four lines, therefore, you can add a maximum of four CTMs/GATM4s per DS30 bus.

•CTM8s/GATM8s have eight lines. This module uses two offset settings per module. Therefore, you can add a maximum of two CTM8/GATM8s per DS30 bus.

•You can mix two modules on the same DS30 bus. For instance, if you have two existing CTM modules with offset 0 and 1, you can add a CTM8 on offset 2.

CTM: The CTM provides connections for four analog calling line identification (CLID) PSTN lines. Each voice line uses one line in the offset. Since each DS30 bus has four lines per offset, you can assign a maximum of four CTMs to a single DS30 bus by making the offset switch settings different for each module. You can also combine three CTMs with the trunk module part of the 4X16 module on the same DS30 bus.

GATM4: The GATM4 provides connections for four analog calling line identification (CLID) or Supervision Disconnect PSTN lines. Each voice line uses one line in the DS30 bus offset. Since each DS30 bus has four lines per offset, you can assign a maximum of four GATM4s to a single DS30 bus by making the offset switch settings different for each module.

CTM8: The CTM8 provides connections for eight analog calling line identification (CLID) PSTN lines. Each line uses one voice line. Since each DS30 bus has four lines per offset, you require two offsets for each module. You can assign a maximum of two CTM8s to a DS30 bus, by making the offset switch settings different for each module.

You can also combine a CTM8 with a 4X16 module on the same DS30 bus.

When you choose an offset number for the CTM8, the system automatically adds the next offset number. You cannot assign offset 3 to the CTM8 module, because this does not allow the module to assign the second set of lines.

GATM8: The GATM8 provides connections for eight analog calling line identification (CLID) or Supervision Disconnect PSTN lines. Each line uses one line in the DS30 bus offset. Since each DS30 bus has four lines per offset, you require two offsets for each GATM8. You can assign a maximum of two GATM8s to a DS30 bus, by making the offset switch settings different for each module. You can also combine a GATM8 with a 4X16 module on the same DS30 number. When you choose an offset number for the GATM8, the system automatically adds the next offset number. You cannot assign offset 3 to the GATM8 module, because this does not allow the module to assign the second set of lines.

Installation and Maintenance Guide