Maintenance Using Tdr - Dell PowerEdge M IO Aggregator Command Reference Manual

Mxl 10/40gbe switch io module ftos command reference guide, ftos 8.3.16.1
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Maintenance Using TDR

The time domain reflectometer (TDR) is supported on all Dell Force10 switch/routers. TDR is an
assistance tool to resolve link issues that helps detect obvious open or short conditions within any of the
four copper pairs. TDR sends a signal onto the physical cable and examines the reflection of the signal that
returns. By examining the reflection, TDR is able to indicate whether there is a cable fault (when the cable
is broken, becomes unterminated, or if a transceiver is unplugged).
TDR is useful for troubleshooting an interface that is not establishing a link, that is, when the link is
flapping or not coming up. Do not use TDR on an interface that is passing traffic. When a TDR test is run
on a physical cable, it is important to shut down the port on the far end of the cable. Otherwise, it may lead
to incorrect test results.
Note: TDR is an intrusive test. Do not run TDR on a link that is up and passing traffic.
To test the condition of cables on 100/1000/10000 BASE-T modules, following these steps using the
command.
tdr-cable-test
Step
Command Syntax
1
tdr-cable-test tengigabitethernet <slot>/
<port>
2
show tdr tengigabitethernet <slot>/<port>
Command Mode
Usage
EXEC Privilege
To test for cable faults on the
TenGigabitEthernet cable.
EXEC Privilege
Displays TDR test results.
Between two ports, you must not start the
test on both ends of the cable.
Enable the interface before starting the
test.
The port must be enabled to run the test or
the test prints an error message.
Interfaces | 139

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