Installing the main distribution frame
14 Installing and Connecting the MDF and Telephones

Cable Slack Manager

A Cable Slack Manager is 32 inches (81.3 centimeters) wide. Slack managers are commonly
used in installations consisting of media gateway stacks, such as the SCC1 Media Gateways.
Determine the quantity of slack managers by dividing the total length of the MDF in inches
(centimeters) by 32 (81.3). A partial number of 0.4 or less should be rounded down, and a
partial number of 0.5 or more should be rounded up (for example: 2.4 = two Cable Slack
Managers and 2.5 = three Cable Slack Managers).
Note:
Note: Cable clamps are required in installations with Cable Slack Managers. At the rear
of the media gateways, on each rear ground plate, install two cable clamps using
the screws provided. These clamps hold the 25-pair input/output or MDF cables
in place.
Installation layout
Make sure you review the following information:
●Information outlet locations on page 14
●Site, satellite, and adapter locations on page14
●Sizing 4-pair station cables on page15
●Sizing 25-pair and multiple 25-pair station cableson page 15
●3-pair station cable circuitson page 15
●4-pair station cable circuitson page 15

Information outlet locations

The customer or marketing representative must provide floor plans showing the information
outlet locations and types (flush- or surface-mounted) required. The floor plans must also show
a complete overview of all conduit and cabling facilities in the building.

Site, satellite, and adapter locations

Use the following information when determining site, satellite, or adapter locations.
●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/satellite locations must be easily accessible and contain AC-powered receptacles.
One 258A/BR2580A adapter 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. Hardware requirements are the same as for the equipment room.