Figure 10-4. 7-Module System Mounted On Self-Supporting Type-1 Frame, Rear - Avaya 6424D+M User Manual

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lNSTALLATION EXAMPLE: DEFINITY GENERIC 2 WITH UNIVERSAL MODULES

Figure 10-4. 7-Module System Mounted on Self-Supporting Type-1 Frame, Rear

— Frame arrangements. Figure 10-5, 7-Module System Mounted on Self-Supporting Type-2 Frame,
Front, and figure 10-6, 7-Module System Mounted on Se/f-Supporting Type-2
arrangement requiring seven type-2 frames. Since this arrangement uses zones, the distribution cable
is separated on the MDF. One side of the frame lineup supports three modules and the other side
supports four, thus most of the spare distribution cable pairs are placed on the side with four
modules. This arrangement is a desirable one, with good jumper capacity, a modest amount of spare
area, and good expansion potential. Since jumper management is the most important consideration
in the design of the MDF, designers should consider type-2 frames for installations of six cabinets or
greater.
— Cable connections to the MDF. Cable connections can be either field-terminated or connectorized.
It is up to the MDF designer, with input from installers, to make this selection. Generally, use
connectorized cables for small installations of five or fewer cabinets; connectorized cables are easier
to install. Use field-terminated cables for installations greater than five cabinets; the slack
management characteristics of field-terminated cables is superior.
Note that in this example we have avoided the problems of managing cable slack by using connector
cables. In a real installation all cables for this size installation should be field-terminated. In this
example, all connections to the frames from the equipment are by connector cables; a real
installation should be field terminated directly to terminal blocks. Field-terminated cables are made
by determining the length needed from the switch to the MDF field, then cutting off the unneeded
portion of a B25A cable.
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