Main Distribution Frame Cross-Connect Fields; Placing The Main Distribution Frame - Avaya S8500 Manual

Main distribution frame cross-connect fields

Each main distribution frame (MDF) contains a trunk/auxiliary field and a distribution field. The
trunk/auxiliary field contains three cross-connect areas:
•
The green field terminates the network interface leads from the central office (CO) and provides
the terminals to cross-connect the leads to the purple or yellow fields as required. A single row of
the 110-type terminal block can terminate 24 1-pair, 8 3-pair, or 12 2-pair trunks.
•
The purple field terminates the trunk circuits from the media gateway with WP-90929, List 1 or 3
concentrator cables. Also, 25-pair cables can be used to terminate trunk circuits from the media
gateway with each trunk circuit pack connecting to one 25-pair row of the 110-type terminal
block. Each terminal block row can terminate 24 1-pair, 8 3-pair, or 12 2-pair trunks.
•
The yellow field provides cross-connect terminals for all miscellaneous leads from the media
gateway, such as alarm monitors, emergency transfer relay power, and attendant console power.
This field is used for emergency transfer wiring, paging equipment, music sources, and so forth.
The distribution field contains four cross-connect areas:
•
The purple field (port field) terminates 25-pair cables from the media gateway. Each line circuit
pack connects to one 25-pair row of the 110-type terminal block. One 25-pair cable is required for
each line circuit pack.
•
The white field (station field) terminates the station wiring. The white field indicates 3-pair station
circuits (eight circuits per 25-pair cable) routed through a satellite closet.
•
The blue field (station field) also terminates station wiring. The blue field indicates 3- and/or 4-
pair station circuits (eight or six circuits, respectively, per 25-pair cable). The fourth pair, of the 4-
pair station circuit provides adjunct power from the cross-connect field on an as-needed basis to
telephones and consoles within 250 feet (76 meters) of the MDF.

Placing the main distribution frame

The preferred location of the MDF is directly behind the media gateways.
Figure 57, Typical 110A-type terminal blocks (G650 Media Gateway),
installation using 110A-type terminal blocks.
176
NOTE:
The TN2183 16-port Analog Line circuit pack requires an adapter cable to connect from
one connector on the media gateway to two 25-pair connectors on a terminal block. The
yellow field (auxiliary field) terminates all 25-pair cables from the auxiliary cabinet (if
used). The yellow field is located in the lower right-hand corner of the distribution field.
Installing the Avaya S8500 Media Server with an Avaya G650 Media Gateway
on page 177 shows a typical
December 2003