19
Testing and Fault Finding (Troubleshooting)
Table 1 - Resistance Table Referenced to the RJ45 at the PIDU
Resistances should fall or -10% of the stated values.
CAT-5
Length
(Meters)
Resistance between
pins 1&2, 3&6 , 4&5 and
pins 7&8 (ohms)
Resistance between
pins 1&3 (ohms)
Resistance
between pins 4&7
(ohms)
0 0.8
1.0
1.6
10 2.7
2.7
3.3
20 4.6
4.4
5.0
30 6.5
6.1
6.7
40 8.3
7.8
8.4
50 10.2
9.5
10.1
60 12.1
11.2
11.8
70 14.0
12.9
13.5
80 15.8
14.6
15.2
90 17.7
16.3
16.9
100 19.6
18.0
18.6
150 29.0
26.5
27.1
200 38.4
35.0
35.6
250 47.7
43.5
44.1
300 57.1
52.0
52.6
More information:
PTP 300 Series User Guide
or
PTP 500 Series User Guide
Section:
“Troubleshooting (Fault Finding)”
4Gon www.4Gon.co.uk [email protected] Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
