Designing The Mdf For A Raised Floor - Avaya 6424D+M User Manual

2-24
MDF/lDF DESIGN: SYSTEM 85 AND DEFINITY GENERIC 2 WITH TRADITIONAL MODULES
Use cross-connect hardware with connectors for equipment cables for systems of 1 to 5 modules.
NOTE: The connector gender of the shielded cables supplied with System 85 R2V4 and earlier
systems is male-to-male (M-M). The connector gender of the shielded cables supplied with DEFINITY
Generic 2 with traditional modules is male-to-female (M-F).
If connector-type, cross-connect hardware is used for connecting equipment cables, make sure that you
order the correct hardware.
Synchronization Clock
The synchronization clock provides enhanced network synchronization and improved transmission
performance in digital networks.
The clock can be connected to either duplicated or unduplicated systems. An unduplicated module or
TMS requires wall field space for 125 pair (5 cables) in consecutive blocks; a duplicated module or
TMS require space for 150 pair (6 cables) in consecutive blocks.
The clock should be connected to the auxiliary equipment and miscellaneous field, that is, the yellow
portion of the wall field. There are three ways to establish the yellow wall field cross connection. In
order of preference they are as follows:
Yellow field—Use a portion of this field that has not been dedicated to other equipment.
Spare field—Convert spare field space to a yellow field dedicated to the clock.
Custom installation— As a last resort, install a 110A-300 block dedicated to the clock on or near the
MDF.

DESIGNING THE MDF FOR A RAISED FLOOR

A modern communications system is perceived by the customer to look like a computer installation.
For this reason, some customers request that the communications systems installed in the equipment
rooms be installed on raised flooring to conceal unsightly cabling and I/O ductwork. Also, where
communications systems are installed beside computer installations, the communications systems wiring
must be out of sight to conform to the computer's installation wiring.
Using the raised-floor design may make installation time longer for systems of two modules or more and
the same amount of time for single-module systems. Changes and additions also may take more time
than the normal installations if cabling is involved. Several factors contribute to the increased time:
some are logistical, such as removing tiles, some are engineering, such as detail design or structural
considerations for frame mounting, and some relate to the installation of cables, such as storage of cable
slack or dressing of cables via holes in the floor.
If you are required to design a raised-flooring MDF, use the following guidelines.
Before designing the layout of an MDF over a raised floor, take into account the following three issues
that can affect the design: