Motorola PTP 500 User Manual download pdf (Page 19)

Testing and Fault Finding (Troubleshooting)

Table 1 - Resistance Table Referenced to the RJ45 at the PIDU

Resistances should fall within + 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)”

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Motorola PTP 500 User Manual Page 19