MDF connections to stations and the public switched telephone network
42 Installing and Connecting the MDF and Telephones
Station cables
For clarity a station cable is either a 25-pair cable, multiple 25-pair cable, or 4-pair D-inside wire
(DIW) run from the equipment room, site/satellite location, or adapter to the information outlets.
The following station cables are available. See Figure 17: Example of extending 4-pair station
cables on page 43.
25-pair station cable — Use between the equipment room and site/ satellite locations or
adapters. Use an A25D cable (male to male) between the equipment room and satellite closet.
Use a B25A cable between the equipment room and site closet or adapter.
Multiple 25-pair station cable — Use between the equipment room and site/satellite locations or
adapters. This cable consists of individually sheathed 25-pair cables with a factory-installed
25-pair connector on each end. Use a male-to-female cable to connect between the equipment
room and site location or adapter. Use a male-to-male cable to connect between the equipment
room and satellite location. Staggered finger cables are recommended for all multiple 25-pair
station cables and are available in both double-ended and single-ended types.
Single modular plug-ended 4-pair station cable — Use this cable between adapters and
information outlets that require push-on connections. It can also be used when 4-pair station
cables are field-terminated on the 110-type terminal blocks in the equipment room or satellite
closet and modularly connected to information outlets. The station cables are available in the
following lengths:
● 10 feet (3.05 meters)
● 25 feet (7.62 meters)
● 50 feet (15.24 meters)
● 75 feet (22.86 meters)
●100 feet (30.5 meters)
●150 feet (45.72 meters)
●200 feet (61 meters)
Note:
Note: If more than 200 feet (61 meters) 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 17: Example of extending 4-pair station cables on page 43.
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.