Mdf Cross-Connect Fields; Main Distribution Frame - Avaya S8700 Manual

MDF 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 twenty-four 1-pair,
eight 3-pair, or twelve 2-pair trunks.
The purple field terminates the trunk circuits from the system with
•
WP-90929, List 1 or 3 concentrator cables. Also, 25-pair cables can be used to terminate
trunk circuits from the system with each trunk circuit pack connecting to one 25-pair row
of the 110-type terminal block. Each terminal block row can terminate twenty-four
1-pair, eight 3-pair, or twelve 2-pair trunks.
The yellow field provides cross-connect terminals for all miscellaneous leads from the
•
system, 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 system. 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.
NOTE:
The 16-port analog line circuit pack requires an adapter cable to connect from one
connector on the system to two 25-pair connectors on a terminal block. Two MET circuit
packs require a concentrator cable to connect from two connectors on the system to one
25-pair connector on a terminal block.
The yellow field (auxiliary field) terminates all 25-pair cables from the auxiliary cabinet
•
and the Processor Interface. The yellow field is located in the lower right-hand corner of
the distribution field.
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 terminals within 250 feet (76 m) of the MDF.

Main Distribution Frame

The preferred location of the Main Distribution Frame (MDF) is directly behind the Avaya
G600 Media Gateway rack(s).
68 shows a typical installation using 110A-type terminal blocks.
''Typical 110A-Type Terminal Blocks (Avaya G600)'' on page
May 2002
Installing the S8700 IP Connect
67