66-TYPE HARDWARE
Layout
Locating Information Outlets
It is the responsibility of the customer or marketing representative to provide floor plans
showing the information outlet locations and types (flush- or surface-mounted). The floor
plans must also provide a complete view of all conduit and cabling facilities in the building.
Locating Satellites and Sites
Use the following information when determining site, satellite, or adapter locations.
a.
b.
c.
Keep the number of locations to a minimum.
To minimize the station wiring distances, centrally locate the sites, satellites, or
adapters among the information outlets.
Site and satellite locations must be easily accessible and contain ac power outlets.
Adapter Requirements
One 258A or BR2580A is required for each 25-pair station cable containing 4-pair station
circuits. One 356A adapter is required for each 25-pair station cable containing 3-pair
station circuits.
66-Type Hardware Requirements
The hardware requirements are the same as for the equipment room.
Sizing 4-Pair Station Cables (DIW)
Use the floor plan scale to determine the station cables (DIW) required per standard
Premises Distribution Systems wiring concepts.
Sizing 25-Pair and Multiple 25-Pair Station Cables
The floor plan scale is used to determine the approximate length of each station cable. The
station cables must be sized and selected properly to make maximum use of the 66-type
hardware at the equipment room or satellite location.
Twenty-five pair A25B cables (double-ended or single-ended) are used to connect adapters
directly to the equipment room cross-connect field or satellite location. Staggered-finger
cables (double-ended or single-ended) are recommended for multiple 25-pair cables run from
the equipment room or satellite location to the adapters. If connectorized 66-type connecting
blocks are being used, B25A cables are required at the equipment room or satellite location
to connect the double-ended (female to female) staggered-finger cables to the 66-type
connecting 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. This will provide additional pairs for
growth and compensate for the fact that every 25th pair in a cable is not used.
Using the minimum size cable requirement, select a cable size that is rounded up to the next
highest available cable bundle size.
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