Comtest Networks 4144 POTS/ISDN Splitter Shelf - Manual (Page 2)

Rev 2-6 Sept. 2009 Page 2 of 6
DSL Cable
LOOP Cable
PSTN Cable
Mounting Bracket
Add if using
.425” screws
• 23 Inch Mounting
For 23 inch mounting, the short side of the mounting brackets is
attached to the side of the shelf. There are three positions to
mount the brackets on the shelf. Choose a suitable mounting
position for the shelf then, using the provided10-32 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 4144 shelf mounting kit.
Cabling Overview
New Installations
The 4144 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 and quantity required.
For improved DSL performance, Comtest recommends the use of CAT 5, or better, cabling on the DSL connectors
for our 4144 POTS 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.