Avaya 6424D+M User Manual page 97

7-12
MDF/lDF DESIGN: DEFINITY GENERIC 2 WITH UNIVERSAL MODULES
Equipment (Switch) Port Field
The equipment port field uses purple labels; it terminates equipment port cables. Two factors govern its
size. The first is the type, usage, and number of port carriers. The second is module needs, since all
ports from an equipment module must be colocated.
Modules usually contain the same number of port carriers. To calculate the number of wiring blocks
required for the entire port field, multiply the number of modules by the number of wiring blocks
required to serve one module.
Each common port carrier (CPC) requires twenty 25-pair cables (500 pairs total) at the cross-connect
field. Since the 110A blocks recommended for the MDF contain 300 pairs, two blocks are needed to
accommodate the 500 pairs of each CPC. Figure 7-6, CPC Wall Field Configuration, displays the
recommended configuration of 110A blocks for each CPC. This configuration leaves 100 unused pairs
that can be used as needed.
A Generic 2 with universal modules uses the universal module control (UMC) cabinet containing space
for three CPCs (J58890BB), therefore space must be provided to serve all three carriers, whether they
are used or not. Allow for the termination of 1800 pairs for the port field. Increase or decrease the
number in 300-pair increments according to actual needs.
NOTE: Use the same rules for designing single carrier port cabinet (SCPC) installations, but note that
there will be eighteen 25-pair cables from each cabinet. These eighteen cables will translate into 450
pairs on two 110A-300 blocks at the cross-connect field, plus 150 spare pairs. Be sure to install enough
110A blocks to serve all three SCPC of the single carrier module whether they are used or not, that is,
allow for termination of 1800 pairs on the port field.
If the system contains both universal and traditional port boards, the MDF will have to be designed to
accommodate both types of boards. If you are upgrading a system from System 85 to DEFINITY
Generic 2, use existing MDF hardware except for patch cords. New systems are connectorized or field-
terminated only.
NOTE: If traditional modules are part of the Generic 2 installation, their use is limited to services other
than ports. Traditional modules require no termination at the cross-connect field.