PTP 250 User Guide
Testing link end hardware
phn-2510_002v000 (Mar 2012)
8-9
Unplug the drop cable from the DATA & POWER OUT port of the PoE power supply. Insert
the drop cable RJ45 plug into the drop cable tester socket. Then, perform the tests
described in
Table 51
. Record the results in the Result column, if this is helpful.
Table 51
RJ45 cable resistance tests at the PoE power supply end
Step
Test
Result
1
Measure the resistance between pins 1 and 2.
Ohms
2
Measure the resistance between pins 3 and 6.
Ohms
3
Measure the resistance between pins 4 and 5.
Ohms
4
Measure the resistance between pins 7 and 8.
Ohms
5
Ensure that the results of steps 1 to 4 are resonabaly the same,
less than one Ohm, for shorter cable lengths and no more than
a few Ohms different for longer lengths. The results will vary
due to the different number of twists each pair has.
The resistance values given in
Table 52
are for guidance. The
maximum DC resistance for each pair should not exceed:
1.4 + (0.188 * cable length in meters)
PASS or FAIL
6
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.
K Ohms
PASS or FAIL
7
Measure the resistance between pin 8 and the screen (ODU
ground). If it is less than 100K ohms (regardless of cable
length), the test has failed.
K Ohms
PASS or FAIL
8
Measure the resistance between pin 1 and pin 8. If it is less
than 100K Ohms (regardless of cable length), the test has
failed.
K Ohms
PASS or FAIL
Содержание PTP 250
Страница 1: ...Cambium PTP 250 User Guide System Release 250 02 01 ...
Страница 8: ...Safety and regulatory information VI phn 2510_002v000 Mar 2012 ...
Страница 20: ...List of Tables xii phn 2510_002v000 Mar 2012 ...
Страница 58: ...System management Chapter 1 Product description 1 30 phn 2510_002v000 Mar 2012 ...
Страница 104: ...Limit of liability Chapter 3 Legal information 3 12 phn 2510_002v000 Mar 2012 ...
Страница 122: ...Notifications Chapter 4 Reference information 4 18 phn 2510_002v000 Mar 2012 ...
Страница 152: ...Installing the PoE power supply Chapter 5 Installation 5 30 phn 2510_002v000 Mar 2012 ...