Comtest Networks 4144 POTS-ISDN User Manual
Model 4144 POTS/ISDN Splitter Shelf Installation Guide
Copyright © 2009,
Comtest Networks Inc.
This guide provides the basic information required to install the Comtest Model 4144 POTS/ISDN Splitter Shelf on
a 19 or 23 inch rack assembly.
Unpacking the 4144 shelf
Before opening the 4144 shipping box, carefully inspect for any signs of damage. If the box has been damaged,
note the damage before opening the box. Open the box and remove the 4144 shelf and carefully examine it for
any damage. If the shelf is damaged, contact your supplier for instructions to return it for a replacement. If there is
no damage, verify that all packed items have been received. You should
receive the following:
• Comtest model 4144 shelf, part number SA-4144-7315
• Quantity 1 Rack Mounting Bracket kit, part number SA-4144-7317
o 2 Rack Mount Brackets, part number SA-4144-7305
• Cable Tie kit, part number SA-4144-7319, containing
o Quantity 18, 8” nylon cable tie wraps, part number HW-CTS0-080N
o Mounting hardware kit, part number SA-0000-0001, consisting of:
Quantity 4, 10-32 x 3/8 screws, part number HW-PP06-05SS
Quantity 4, #10 external tooth lock washers, part number
HW-WE06-00SS
If any of the above items are missing, please contact your supplier.
Installation
The 4144 requires 3U (5.25 inches) of rack space. The shelf is supplied with mounting brackets and hardware to
allow installation in a 19 inch or 23 inch rack.
Mounting Hardware
Preparation for Mounting
• 19 Inch Mounting
For 19 inch mounting, the long side of the mounting
bracket is attached to the side of the shelf. There are
three positions to mount the bracket on the shelf and four
positions on the mounting bracket. The Rack Mounting
Bracket can also be mounted with the flange at the back.
Thus, there are 24 possible mounting positions for the
Rack Mounting Bracket. 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 4144 shelf mounting kit.
Mounting Bracket
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• 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
Mounting Bracket
New Installations
dd if using
.425” screws
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-JS0203ZI 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 120o cover so that
routing of the cables is simplified.
PSTN Cable
LOOP Cable
DSL Cable
CAUTION - To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cord/cable.
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