Avaya 6424D+M User Manual page 45

2-22
MDF/lDF DESIGN: SYSTEM 85 AND DEFINITY GENERIC 2 WITH TRADITIONAL MODULES
In addition to the preceding guidelines, observe these rules when designing zones:
Mount the hardware on frames. For one-zone installations, wall-mounted frames may be used. For
two-zone installations, double-sided, self-supporting frames must be used.
Divide the distribution cables (in 100-pair increments) as equally between zones as possible. For
example, assume that an installation has two zones and a 300-pair distribution cable. You would
terminate 100 pairs at one zone and 200 pairs at the other.
Do not add extra cable pairs to a distribution cable to achieve an equal number of terminations at all
zones. That is, do not add 100 pairs to the 300-pair cable in order to terminate 200 pairs at both
zones.
Do not spread the equipment ports at the MDF.
When you use zones in the equipment room, the proper cross connections at the IDF are crucial. Figure
2-13, Closet Cross-Connects Using Type-1 Frames, illustrates IDF cross-connections of distribution
cables originating from two different zones in the equipment room. Make sure that you label the IDF
cross-connections as follows:
IO number for an extension
Equipment line location (ELL) number for that extension
Module number for that ELL