Install Telecommunications Cabling
Station Wiring Design
418
SI Installation and Upgrades
June 2004
•
150 ft (45.72 m)
•
200 ft (61 m)
NOTE:
If more than 200 ft (61 m) of 4-pair station cable is required, a 451A in-line adapter
(double-ended modular female connector) is attached to the cable and a second 4-pair
cable of the required length is plugged into the adapter. See
Figure 144, Example of
Extending 4-Pair Station Cables,
on page 419.
Double modular plug-ended 4-pair station cable
—
Use this cable to provide nonstandard length runs
between adapters and information outlets with push-on connections. It can also be used between adapters
and modularly connected information outlets. It is available in the same lengths as the single modular
plug-ended cable.
Bulk Cable
—
Same as the 25-pair cable or multiple 25-pair cable; however, the bulk cable is not
equipped with connectors. Use this cable between the equipment room and satellite closets when both are
equipped with punch-down type terminal/connecting blocks.
4-pair station cable
—
Use this cable when 4-pair station cables are to be field-terminated on the 110-
type terminal blocks in the equipment room or satellite closet and the information outlets require push-on
connections
Closets
Site Locations
Site locations are closets that provide a point in the station wiring for the administration of remote
powering. Adapters are used at site locations to terminate the 25-pair station cables and provide
connection points (modular jacks) for power adapters and 4-pair station cables.
The258A and BR2580A adapters plug into a 25-pair female cable connector. These adapters divide the
25-pair cable into six 4-pair (modular jack) circuits. See
Figure 145, 258A and BR2580A Adapters,
on
page 420.
The 356A adapter plugs into a 25-pair female cable connector. See
Figure 146, 356A Adapter,
on page
420. The 356A adapter divides the 25-pair cable into eight 3-pair circuits. Although the circuits are 3-
pair, the adapters modular jacks will accept the 8-wide modular plug used on the 4-pair station cable.
CAUTION:
Adapters wired similarly to the 356A should not be used. Their jacks do not accept 4-pair
plugs.
Use theZD8AJ adapter to connect a Multi-button Electronic Telephone (MET) line cord to an information
outlet. The adapter interchanges pairs 3 and 4 to correspond with the pair assignments for the telephone.
The line cord plugs into the adapter, and then the adapter plugs into an information outlet.
