Instruction manual

The Control Unit
1-4
Installation, SPM, Maintenance, and Troubleshooting Supplement
100 DCD Module 1
The 100 DCD module functions like the 100 DS1 module but has a built-in
channel service unit (CSU) and data service unit (DSU). Therefore, this module
needs no external CSU or DSU. The module accommodates up to 23 PRI
channels and 24 T1 channels.
The 100 DCD module can fit into both metal and plastic carriers. Therefore, you
can add this module to an existing MERLIN LEGEND Communications
System, where it functions like other 100 DS1 modules.
412 LS-ID-TDL Module 1
The 412 LS-ID-TDL module contains four loop-start ports with Caller ID
capability and twelve ports for connection to the 4400-Series telephones. The
module also has four Touch-Tone Receivers (TTRs) and two potential operator
positions in the first and fifth extension ports. This module can fit into both
metal and plastic carriers.
If the 412 LS-ID-TDL module is in Slot 1, you can connect a 4424LD+
telephone to the first extension port and use that telephone as the system
programming console.
The CSU/DSU functionality of the 100 DCD module is supported only
in MERLIN MAGIX systems of Release 1.5 or later.
Use this module when a customer’s requirements indicate the need for
an external router or when the customer has an external router in
place. Otherwise, use the 100R INA module with its internal router.