Comtest Networks 4048 SYSTEM 5 Splitter Shelf - Manual (Page 2)

Rev 2-5 June 2009
Page 2 of 6
Mounting Brackets
Add if using
.425” screws
• 23 Inch Mounting
For 23 inch mounting, the short side of the mounting bracket
is attached to the side of the shelf. There are three positions
to mount the bracket on the shelf. Choose a suitable
mounting position for the shelf then, using the provided 10-32
screws and lock washers, attach the bracket to each side of
the shelf. Place the shelf in position on the rack and, using
the appropriate screws and lock washers, attach the shelf to
the rack. Please note the hardware (screws) required to
mount the shelf to the rack is not supplied with the 4048 shelf
mounting kit.
Cabling Overview
New Installations
The 4048 Splitter Shelf cabling configurations will vary depending on installation
locations and the number of lines supported by the DSLAM. However, the physical
interface to the rear panel connectors is standard 50-pin RJ-21 type receptacle
connectors. Each splitter card uses 24 pairs of the 25 pairs available on each 50-pin
connector. After the shelf has been attached to the rack, the cabling can be prepared
as shown below.
The threaded mounting holes for the RJ-21 covers are designed to utilize ¾” captive
pan head screws. However, if only 0.425” captive pan head screws are available,
jack screws will have to be screwed into the RJ-21 connectors before assembling the
cover. Jack screws are available separately, order Comtest part number: HW-JS02-
03ZI.
For improved DSL performance, Comtest recommends the use of CAT 5, or better, cabling on the DSL
connectors for our 4048 Splitter Shelf in order to ensure that optimum system performance is achieved and
maintained. Comtest suggest that the CAT 5 mating connectors used be equipped with either a 90
o
or 120
o
cover so that routing of the cables is simplified.
CAUTION - To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cord/cable.
DSL Cable
LOOP Cable
POTS Cable