Install the Main Distribution Frame (MDF) Hardware ��

NOTE: If standard 110A cross-connect equipment is used, consult DEFINITY Communications System Generic 1 and Generic 3 Main Distribution Field Design (555-230-630).

SYSTIMAX 110-type hardware is used for the Main Distribution Frame (MDF). 110-type hardware is available in two basic types: the 110A and 110P. The 110A requires less wall space than the 110P. The 110P includes horizontal and vertical cable troughs for managing cross-connect cables. The system is connected to the MDF with the supplied B25A male to female 25-pair cables. The cables are provided in 10-foot (3 m) and 15-foot (4.5 m) lengths.

Refer to DEFINITY Communications System Generic 1 and Generic 3 Main Distribution Field Design (555-230-630) for more information.

Example MDF Connections (Avaya G600 Media Gateway) shows a detailed example of the Avaya G600 Media Gateway cables connecting media gateways and satellite closets to the Main Distribution Frame (MDF). The figure shows the cross-connections for one example station circuit.

Example MDF Connections (Avaya G600 Media Gateway)�������

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). Typical 110A-Type Terminal Blocks (Avaya G600) shows a typical installation using 110A-type terminal blocks.

Typical 110A-Type Terminal Blocks (Avaya G600)�������

Main Distribution Frame Labels���

Label Graphic Symbols and Nomenclature shows the graphic symbols used on labels for the system, cross-connections, information outlets, and cables. The labels are color-coded to identify system wiring:

• Green -- To Central Office (CO)
• Purple -- To system ports
• Yellow -- To auxiliary equipment and miscellaneous system leads
• Blue -- To information outlets
• White -- From Main Distribution Frame to satellite locations (3-pair)

Each label identifies 2 rows on the terminal block. The upper half identifies the row above it, and the lower half identifies the row below it. The labels are inserted into the clear plastic designation strips furnished with the terminal blocks. The strip is snapped in place between the terminal block rows. Label code number 1220A (comcode 103970000) contains all of the required labels.

Label Graphic Symbols and Nomenclature���