Chapter 5: Installation
Installing the copper Cat5e Ethernet interface
4 At the PSU end only: Do not fit a cable gland. Strip the cable outer sheath and fit the RJ45
connector load bar. Fit the RJ45 connector housing. To ensure there is effective strain relief,
locate the cable inner sheath under the connector housing tang:
Test resistance in the drop cable
Connect the bottom end of the copper Cat5e drop cable to a PTP drop cable tester and test that the
resistances between pins are within the correct limits, as specified in the table below. If any of the
tests fail, examine the drop cable for wiring faults. Order the PTP drop cable tester from the
support website (
http://www.cambiumnetworks.com/support
).
Measure the
resistance
between…
Enter
measured
resistance
To pass test,
resistance must
be…
Circle
“Pass” or
“Fail”
Additional tests and
notes
Pins 1 and 2
Ohms
<20 Ohms
(60 Ohms) (*1)
Pass
Fail
Resistances must be
within 10% of each other
(*2). Circle “Pass” or
“Fail”:
Pass
Fail
Pins 3 and 6
Ohms
<20 Ohms
(60 Ohms) (*1)
Pass
Fail
Pins 4 and 5
Ohms
<20 Ohms
(60 Ohms) (*1)
Pass
Fail
Pins 7 and 8
Ohms
<20 Ohms
(60 Ohms) (*1)
Pass
Fail
Pin 1 and screen
(ODU ground)
K Ohms
>100K Ohms
Pass
Fail
These limits apply
regardless of cable
length.
Pin 8 and screen
(ODU ground)
K Ohms
>100K Ohms
Pass
Fail
(*1) A resistance of 20 Ohms is the maximum allowed when the cable is carrying Ethernet.
A resistance of 60 Ohms is the maximum allowed when the cable is carrying only power to the
ODU (when Ethernet is carried by one of the other ODU interfaces).
(*2) Ensure that these resistances are within 10% of each other by multiplying the lowest
resistance by 1.1 – if any of the other resistances are greater than this, the test has failed.
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