Testing The E1/T1 Installation; Pre-Power Testing; Table 46 - Resistance Table Referenced To The E1/T1 Source - Motorola PTP 600 Series User Manual

15.7 Testing the E1/T1 Installation

If you have opted to fit a Lightning Protection Unit, it should be tested as described in Section
10.3 "Installation".
Test the telecoms links by performing loopback connections as described in Section 8.3.1.6
"Telecoms Configuration Page".

15.7.1 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 46 column 2.
Check the cable resistance between pins 1 & 2 (Orange/White & Orange) and 4 & 5 (Blue &
Blue/White). Check against Table 46 column 3.

Table 46 - Resistance Table Referenced To the E1/T1 Source

CAT-5 Length (Meters)
0
10
20
30
40
50
60
70
80
90
100
Resistance between pins
3 & 6 and pins 7 & 8
(ohms)
0.8
2.5
4.2
5.9
7.6
9.3
11.0
12.7
14.4
16.1
17.8
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15 E1/T1 Installation Guide
Resistance between pins
1 & 2 and pins 4 & 5
(ohms)
1.3
3.0
4.7
6.4
8.2
9.8
11.5
13.2
14.9
18.2
18.3