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Physical requirements and layout
Issue 3 January 2008 15
Sizing 4-pair station cables
Use the scale of the floor plan to determine the approximate length of the station cables
required per the standard SYSTIMAX wiring concepts.
Sizing 25-pair and multiple 25-pair station cables
Use the scale of the floor plan to determine the approximate length of each 25-pair station
cable. The cables must be selected and properly sized to make maximum use of the hardware
at the equipment room or satellite location.
Use 25-pair B25A cables to connect adapters directly to the MDF or satellite location.
Staggered-finger cables, equipped with factory-installed 25-pair connectors at both ends,
should be used when multiple 25-pair cables are used between the equipment room or satellite
location and the adapters. B25A cables are required at the equipment room or satellite location
to connect the staggered-finger cables to the 110-type terminal blocks.
Use the following information to determine the cable size (cable pairs) required for either 3-pair
or 4-pair circuits. Note the length and size on the floor plan to aid in the ordering and installation
of the station cables.
3-pair station cable circuits
To determine the size of station cables containing 3-pair circuits, multiply the number of 3-pair
circuits required at the satellite location by 3.5. Then, using the minimum size cable
requirement, round up the cable size requirement to the next highest available cable bundle
size. This will provide additional pairs for growth and compensate for every twenty-fifth pair in a
cable that is not used.
4-pair station cable circuits
To determine the size of station cables containing 4-pair circuits, find out how many information
outlets are served by the equipment room MDF or satellite location MDF. Multiply the number of
information outlets by 4. Then, using the minimum size cable requirement, round up the cable
size requirement to the next highest available cable bundle size.
Note:
Note: This formula may not compensate for the unused 25th pair in all cases. If not, it
must be allowed for.