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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Install Telecommunications Cabling
Page 2-3Equipment Room Hardware
2
Cross-Connect Fields
Each MDF contains a trunk/auxiliary field and a distribution field. The
trunk/auxiliary field contains 3 cross-connect areas:
1.
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.
2.
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.
3.
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 4 cross-connect areas:
1.
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:
This is the case except for the 16 port analog circuit pack and the
MET circuit pack. The 16-port analog line circuit pack requires an
adapter cable to connect from 1 connector on the system to 2
25-pair connectors on a 110-type terminal block. Two MET circuit
packs require a concentrator cable to connect from 2 connectors on
the system to one 25-pair connector on a 110-type terminal block.
2.
The yellow field
(auxiliary field) terminates all 25-pair cables from the
auxiliary cabinet and adjunct equipment cabinets. The yellow field is
located in the lower right-hand corner of the distribution field.
3.
The white field
(station field) terminates the station wiring. The white field
indicates 3-pair station circuits (8 circuits per 25-pair cable) routed
through a satellite closet.
4.
The blue field
(station field) also terminates station wiring. The blue field
indicates 3- and/or 4-pair station circuits (8 or 6 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) (wire length) of the MDF.