PHY Diagnostics Commands
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PHY Diagnostics Commands
test cable-diagnostics tdr
Use the
test cable-diagnostics
tdr
Privileged EXEC mode command to use
Time Domain Reflectometry (TDR) technology to diagnose the quality and
characteristics of a copper cable attached to a port.
Syntax
test cable-diagnostics tdr interface
interface-id
Parameters
interface-id
—Specifies an interface ID. The interface ID must be an
Ethernet port.
Command Mode
Privileged EXEC mode
User Guidelines
The port to be tested should be shut down during the test, unless it is a
combination port with fiber port active.
The maximum length of cable for the TDR test is 120 meters.
Example
The following examples test the copper cables attached to ports 7 and 8.
Console#
test cable-diagnostics tdr interface
gi1/0/7
Cable is open at 64 meters
Console#
test cable-diagnostics tdr interface
gi1/0/8