Running The Tdr Test - Cisco Catalyst 4500 Series Configuration Manual

Chapter 8 Checking Port Status and Connectivity
Four pairs of standard category 5 cable exist. Each pair can assume one of the following states: open (not
Note
connected), broken, shorted, or terminated. The TDR test detects all four states and displays the first
three as "Fault" conditions, and displays the fourth as "Terminated." Although the CLI output is shown,
the cable length is displayed only if the state is "Faulty."
TDR feature is supported on the following modules:
WS-X4524-GB-RJ45V
WS-X4548-GB-RJ45
WS-X4548-GB-RJ45V
WS-X4548-GB-RJ45V+
WS-X4548-RJ45V+
WS-X4748-RJ45+E
WS-X4748-RJ45V+E
WS-X4748-UPOE+E
WS-X4908-10GB-RJ45 (only functions on WS-C4900M chassis)
WS-C4948E
WS-C4948E-F
TDR detects a cable fault by sending a signal along its wires and depending on the reflected signal it can
determine roughly where a cable fault could be. The variations on how TDR signal is reflected back
determine the results on TDR. On cat4k products, we only support cable fault types: OPEN or SHORT.
We do display Terminated status in case cable is proper terminated and this is done for illustrative
purpose.

Running the TDR Test

To start the TDR test, perform this task:
Command
Step 1
Switch# test cable-diagnostics tdr
{ {
interface interface interface-number
Step 2
Switch# show cable-diagnostics tdr
{ {
interface interface interface-number
This example shows how to start the TDR test on port 1 on module 2:
Switch# test cable-diagnostics tdr int gi2/1
Switch#
This example shows the message that displays when the TDR test is not supported on a module:
Switch# test cable-diagnostics tdr int gi2/1
00:03:15:%C4K_IOSDIAGMAN-4-TESTNOTSUPPORTEDONMODULE: Online cable
diag tdr test is not supported on this module
Switch#
This example shows how to display TDR test results for a port:
OL-25340-01
Checking Cable Status Using Time Domain Reflectometer
Purpose
Starts the TDR test.
}}
Displays the TDR test counter information.
}}
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
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