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Chapter 5: Installation
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...
Pins 1 and 2
Pins 3 and 6
Pins 4 and 5
Pins 7 and 8
Pin 1 and screen
(ODU ground)
Pin 8 and screen
(ODU ground)
(*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.
Enter
To pass test,
measured
resistance must
resistance
be...
Ohms
<20 Ohms
(60 Ohms) (*1)
Ohms
<20 Ohms
(60 Ohms) (*1)
Ohms
<20 Ohms
(60 Ohms) (*1)
Ohms
<20 Ohms
(60 Ohms) (*1)
K Ohms
>100K Ohms
K Ohms
>100K Ohms
Page
Installing the copper Cat5e Ethernet interface
Circle
Additional tests and
"Pass" or
notes
"Fail"
Pass
Fail
Resistances must be
Pass
within 10% of each other
Fail
(*2). Circle "Pass" or
"Fail":
Pass
Fail
Pass
Fail
Pass
These limits apply
Fail
regardless of cable
Pass
length.
Fail
5-20
Pass
Fail
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