User's Guide Part 2

Installing E1 and T1 Chapter 5 Installation
phn-0896_009v003
5-58
UNDER DEVELOPMENT
Feb 2010
Testing the E1/T1 installation
If you have opted to fit a Lightning Protection Unit, it should be tested as described in
LPU installation wiring on
page 2-24.
Test the telecoms links by performing loopback connections as described in
Configuring the telecoms circuits on page 6-49.
Pre-power testing
Before connecting your E1/T1 source, check the following resistances:
• Check the cable resistance between pins 3 & 6 (Green/White & Green) and 7 & 8
(Brown/White & Brown). Check against Table 5-4 col
umn 2.
• Check the cable resistance between pins 1 & 2 (Orange/White & Orange) and 4 &
5 (Blue & Blue/White). Check against Table 5-4 col
umn 3.
Table 5-4 Resistance referenced to the E1/T1 source
CAT-5 Length (Meters) Resistance between pins
3 & 6 and pins 7 & 8
(ohms)
Resistance between pins
1 & 2 and pins 4 & 5
(ohms)
0 0.8 1.3
10 2.5 3.0
20 4.2 4.7
30 5.9 6.4
40 7.6 8.2
50 9.3 9.8
60 11.0 11.5
70 12.7 13.2
80 14.4 14.9
90 16.1 18.2
100 17.8 18.3