AT&T MERLIN LEGEND Release 3.1 System Planning Manual page 245

Adding to the System
2. On Form 1 (page 2), System Planning, review the completed Control Unit
Diagram and determine whether the module type needed is present. Do
one of the following:
If the module is not in the control unit, skip to Step 4.
If the module type needed is already in the control unit, proceed to
Step 3.
3. Determine whether there are jacks available on the module for the new
line/trunk, auxiliary equipment, or telephone by referring to Form 2a,
System Numbering: Extension Jacks, or Form 2c, System Numbering:
Line/Trunk Jacks. Do one of the following:
If there are sufficient jacks available on an existing module, plan to
connect the added line/trunk, equipment or telephone to them. Skip to
Step 6.
If no jacks are available, proceed to Step 4.
4. Plan the placement of the new module required to support the line/trunk,
auxiliary equipment, or telephone by reviewing the guidelines that follow
and deciding where the new module should be placed.
The power supply module must be placed in the far left slot of each
carrier.
The processor module must be installed in Slot 0 of the basic carrier.
Line/trunk and/or extension modules can be placed in any order in
Slots 1 through 17 (with two expansion carriers), with the following
conditions:
— Install the modules in each carrier from left to right, with no empty
— If the system includes a QCC, the 008 MLX module that supports it
— Place all older 008 OPT modules (Apparatus Codes 517A28–
6–4
Modifications
slots between modules.
must be the first extension module in the control unit.
517C28) and 012 modules (Apparatus Codes from 517C13–
517F13) in carriers with ring generators installed in the power
supply module. Current versions of 008 OPT modules (Apparatus
Code 517D28), 012 modules [Apparatus Code 517G13(28)], and
016 modules (Apparatus Code 517A34) have built-in ring
generators and can be mixed in carriers with the older modules
that already have a generator in place.