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Configuring System Information
EdgeSwitch
™
Administration Guide
Ubiquiti Networks, Inc.
Cable Test
The cable test feature enables you to determine the cable connection status on a selected port. You can also
obtain an estimate of the length of the cable connected to the port, if the PHY on the ports supports this
functionality.
Note:
The cable test feature is supported only for copper cable. It is not supported for optical fiber cable.
To access the
Cable Test
feature, click
System
>
Port
>
Cable Test
.
The page displays additional fields when you click
Test Cable
. The fields that are displayed depend on the
cable test results.
Cable Test
Cable Test Fields
Field
Description
Interface
Select the port (with connected cable) to be tested.
Failure Location Distance
The estimated distance from the end of the cable to the failure location.
Note:
This field displays a value only if the
Cable Status
is
Open
or
Short
; otherwise, this field is blank.
Cable Length
The estimated length of the cable in meters. If the cable length cannot be determined,
Unknown
is displayed. This field shows the range between the shortest estimated length and the longest
estimated length.
Note:
This field displays a value only when the
Cable Status
is
Normal
; otherwise, this field is blank.
Cable Status
This field is displayed after you click
Test Cable
and test results are available. Values include.
•
Normal
The cable is working correctly.
•
Open
The cable is disconnected or there is a faulty connector.
•
Open and Short
There is an electrical short in the cable.
•
Cable status test failed
The cable status could not be determined. The cable may in fact be
working.
Select a port from the
Interface
drop-down menu and click
Test Cable
to display its status.
If the port has an active link while the cable test is run, the link can go down for the duration of the test.
The test may take several seconds to run. The command returns a cable length estimate if this feature is
supported by the PHY for the current link speed.
Note:
If the link is down and a cable is attached to a 10/100 Ethernet adapter, the displayed
Cable
Status
may be
Open
or
Short
because some Ethernet adapters leave unused wire pairs unterminated or
grounded.