AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 35

Control Unit
Module Placement
See "Station Jack Connections" in this
chapter for information on QCCs
2-6 Modules
Planning Form Instructions - Continued
To determine the number of extensions assigned:
Multiply the number of physiocal jacks by module type by the number of
5.
station extensions the system assigns to each module's jack type.
N O T E : Since the system assigns an additional four extensions to each 008
OPT module you must multiply the number of 008 OPT modules by four
and add this subtotal to the result shown in the "Physical Jacks by Module
Type" column.
6.
Write the results in the "Total Station Extension Assigned" column.
Add the column and fill in the "System Totals" line.
7.
Use the "Control Unit Diagram" on PBX System Form 1 and the following
guidelines to plan where the modules are placed in the control unit:
Put the power supply module in the far left slot of each
Put the processor module
Put trunk and station modules
following conditions:
Put the modules in each carrier from left to right with
between modules. (The system does not acknowledge modules in slots
that follow an empty slot; slots to the right of the last module can be left
empty.)
If the system includes a queued call console (QCC), make the 008 MLX
module the first station module (located to the left of any 008, 408, or 408
GS/LS modules).
Put all 012 and 008 OPT modules in the same carrier whenever possible
(These modules use a frequency generator.)
Group all 800 DID, 100D, and 400EM modules together according to
type, whenever possible, to save time in system programming.
Each physical jack on the control unit is numbered sequentially from left to right
and bottom to top:
Station jacks are numbered from 1 to 144.
Trunk jacks are numbered from 1 to 80.
This sequence of numbers is called the "logical ID." It is the basis for how you
connect components to the control unit, as well as how the system assigns
station extension numbers and trunk numbers.
in slot 00 of the basic carrier.
in any order in slots 01 through 17, with the
carrier.
no empty slots