Administrator Guide

Time Domain Reflectometer (TDR) Commands
TDR is useful for troubleshooting an interface that is not establishing a link; either it is flapping or not coming up at all. TDR
detects open or short conditions of copper cables on 100/1000 Base-T modules.
Important Points to Remember
● The interface and port must be enabled (configured—refer to the interface command) before running TDR. An error
message is generated if you have not enabled the interface.
● The interface on the far-end device must be shut down before running TDR.
● Because TDR is an intrusive test on an interface that is not establishing a link, do not run TDR on an interface that is passing
traffic.
● When testing between two devices, do not run the test on both ends of the cable.
tdr-cable-test
Test the condition of copper cables on 100/1000 Base-T modules.
Syntax
tdr-cable-test interface
Parameters
interface Enter the keyword GigabitEthernet then the slot/port information for the
100/1000 Ethernet interface.
Defaults None
Command Modes EXEC
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
EMC Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.9(0.0) Introduced on the C9010.
9.8(2.0) Introduced on the S3100 series.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7.0.0 Introduced on the S5000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
8.2.1.0 Introduced on the E-Series.
7.7.1.0 Introduced on the S Series.
7.6.1.0 Introduced on the C-Series.
6.1.1.0 Introduced on the E-Series.
Usage
Information
The interface must be enabled to run the test or an error message is generated:
DellEMC# tdr-cable-test gigabitethernet 5/2
%Error: Interface is disabled GI 5/2
Syslog messages are generated when the link flaps during TDR tests.
Interfaces 693