Avaya 6424D+M User Manual page 52

MDF/lDF DESIGN: SYSTEM 85 AND DEFINITY GENERIC 2 WITH TRADITIONAL MODULES
Cable Routing
Take special care to ensure that cables from different modules do not cross at the MDF and that
distribution cables are not crossed over module cables. Make sure that the cables routed under the raised
floor are dressed and that they are done so with a minimum of slack to prevent tangled cables that can
obstruct access to other under-floor equipment. The routing of the cables beneath a computer/raised
floor should be coordinated with the NEC.
Frames
Use wall-mounted or self-supporting frames for MDFs that you install with raised floors. Terminal
blocks mounted directly to the wall require cables to be fed from both the top and bottom exposing the
cables to view and defeating the purpose of the raised-floor installation. However, if the customer does
not object to the exposed cabling, wall mount the wiring blocks directly — that is without frames.
Self-supporting frames usually are bolted directly to the base floor, figure 2-17, Floor-Secured Frame
Installation, and this method of installation requires the removal of the raised floor stringers. Obtain the
cooperation of the floor installer to install frames. Use a frame whose height has been increased to fit
the raised floor, and make sure you include the increased height in ordering them.
You also can install self-supporting frames by bolting them to the top of the stringer system. Before
planning this approach, confer with the customer and the manufacturer of the raised-floor system. Brace
all self-supporting frames at their tops whether you have anchored them to the base floor or to the top of
the stringer system.
Floor Plan
Consult with the National Engineering Center (NEC) to obtain a detailed floor plan for the system 85 or
DEFINITY Generic 2 installation. This includes cable distances, tile cutouts, the relationship of the
System 85 or DEFINITY Generic 2 with traditional module equipment to the stringer system, and the
relationship of the MDF to the stringer system.
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