Pre-Power Testing

Before plugging the RJ45 connector fitted to the lower LPU (or if not fitted the ODU) into the PIDU check the following resistances at the RJ45;

a.Check the cable resistance between pins 1&2, 3&6, 4&5 and 7&8 at the RJ45. Check against column 2 in Table 1.

b.Resistances for each pair should be within 1ohm of each other.

c.Check the resistance between pins 1&3 and 4&7 at the RJ45. Check against column 3 and 4 in Table 1.

d.Ensure that there is greater than 100K ohms between pins 1 & 8 for all cable lengths.

e.Ensure that there is greater than 100K ohms between pin 1 and ODU ground for all cable lengths.

f.Ensure that there is greater than 100K ohms between pin 8 and ODU ground for all cable lengths.

Cat5E

Resistance

Resistance

Resistance

Length

between pins

between pins

between pins

(meters)

1&2, 3&6, 4&5

1&3

4&7

 

and 7&8

(ohms)

(ohms)

 

(ohms)

 

 

0

0.8

1.0

1.6

10

2.5

2.7

3.3

20

4.2

4.4

5.0

30

5.9

6.1

6.7

40

7.6

7.8

8.4

50

9.3

9.5

10.1

60

11.0

11.2

11.8

70

12.7

12.9

13.5

80

14.4

14.6

15.2

90

16.1

16.3

16.9

100

17.8

18

18.6

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

8

1

Identification of pin 1

13

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Motorola PTP 500, PTP 300 installation instructions Pre-Power Testing, Cat5E Resistance, Between pins, Meters 3&6, 4&5, Ohms

PTP 500, PTP 300 specifications

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