Comtest Networks 4048 SYSTEM 5 Splitter Shelf - Manual (Page 3)

Rev 2-5 June 2009
Page 3 of 6
Install the cables in the following sequence:
• Connect DSL Cable first
Insert the screw through the connector cover and into the RJ-21 connector provided on the back panel
and carefully tighten. Note, do not over tighten this screw as the RJ-21 plug assembly will not sit properly
on the RJ-21 receptacle resulting in poor voice/data connections. To ensure that the connector plug
remains firmly in place, insert a tie-wrap through the tie wrap mount and wrap over the cover and lock
firmly into place.
• Connect LOOP Cable second
Assemble the connector cover and plug as above.
• Connect PSTN Cable last
Assemble the connector cover and plug as above.
Route the cables on top of each other and add additional cable ties as necessary to achieve a neat, orderly
cable arrangement. After a row of connectors has been completed, repeat the above steps for the remaining
row of connectors.
Note, other cable cover assemblies are, of course, possible. You may wish to change the arrangement of the
cables to suit your normal operating practices.
Connector Pin Outs
As viewed from the rear of the shelf:
• xDSL signals to and from the DSLAM
enter the 4048 splitter shelf using the
left most RJ-21 type connectors,
designated ‘DSL’ interface. Use
CAT5 Cabling.
• Signals to and from the LOOP
(outside plant) enter the 4048 splitter
shelf using the centre RJ-21 type
connectors, designated ‘LOOP’
interface. Use CAT5 Cabling.
• Cables to and from the central office
switch enter the 4048 splitter shelf via
the right hand RJ-21 type connectors,
designated ‘PSTN’ interface. Use
CAT3 Cabling.
Filter xDSL Connector LOOP Connector PSTN Connector
No. Tip Ring Tip Ring Tip Ring
1 26 1 1 2 1 2
2 27 2 3 4 3 4
3 28 3 5 6 5 6
4 29 4 7 8 7 8
5 30 5 9 10 9 10
6 31 6 11 12 11 12
7 32 7 14 15 14 15
8 33 8 16 17 16 17
9 34 9 18 19 18 19
10 35 10 20 21 20 21
11 36 11 22 23 22 23
12 37 12 24 25 24 25
13 38 13 26 27 26 27
14 39 14 28 29 28 29
15 40 15 30 31 30 31
16 41 16 32 33 32 33
17 42 17 34 35 34 35
18 43 18 36 37 36 37
19 44 19 39 40 39 40
20 45 20 41 42 41 42
21 46 21 43 44 43 44
22 47 22 45 46 45 46
23 48 23 47 48 47 48
24 49 24 49 50 49 50