Table 8-1 Rj45 Cable Resistance Tests At The Poe Power Supply End - Motorola PTP 250 User Manual

PTP 250 User Guide

Table 8-1 RJ45 cable resistance tests at the PoE power supply end

Step Test
1 Measure the resistance between pins 1 and 2.
2 Measure the resistance between pins 3 and 6.
3 Measure the resistance between pins 4 and 5.
Measure the resistance between pins 7 and 8.
4
Ensure that all the results of steps 1 to 4 are within 10%
5
of each other as follows:
Measure the resistance between pins 1 and 3. Subtract
6
0.2 Ohms.
Measure the resistance between pins 4 and 7. Subtract
7
0.8 Ohms.
Compare the results of steps 1 to 4 and steps 6 to 7 to
8
the maximum allowed, that is 20 Ohms.
If any of the steps 1 to 6 results are greater than the
maximum allowed, the test has failed.
9 Measure the resistance between pin 1 and the screen
(ODU ground). If it is less than 100K ohms (regardless
of cable length), the test has failed.
Measure the resistance between pin 8 and the screen
10
(ODU ground). If it is less than 100K ohms (regardless
of cable length), the test has failed.
Measure the resistance between pin 1 and pin 8. If it is
11
less than 100K Ohms (regardless of cable length), the
test has failed.
phn-2182_002v000
May 2011
Take the minimum result and multiply by 1.1.
If any of the remaining steps 1 to 4 results are
greater than this, the test has failed.
Testing link end hardware
Result
Ohms
Ohms
Ohms
Ohms
PASS or
FAIL
Ohms
Ohms
PASS or
FAIL
K Ohms
PASS or
FAIL
K Ohms
PASS or
FAIL
K Ohms
PASS or
FAIL
8-11