support both the copper and fiber-optic media types. On such ports or interfaces, you
must configure the media type as copper to run the TDR test.
You can run the TDR test from operational mode and view the success or failure results
of the test. To start a test on a specific interface, issue the request diagnostics tdr start
interface interface-name command. To stop the TDR test currently in progress on the
specified interface, issue the request diagnostics tdr abort interface interface-name
command. To display the test results for all copper interfaces, enter the show diagnostics
tdr command. To display the test results for a particular interface, enter the show
diagnostics tdr interface interface-name command.
Related
Documentation
Diagnosing a Faulty Twisted-Pair Cable on ACX Series Routers on page 1330•
Diagnosing a Faulty Twisted-Pair Cable on ACX Series Routers
Problem Description: A 10/100BASE-T Ethernet interface has connectivity problems that you
suspect might be caused by a faulty cable.
Solution Use the time domain reflectometry (TDR) test to determine whether a twisted-pair
Ethernet cable is faulty.
The TDR test:
• Detects and reports faults for each twisted pair in an Ethernet cable. Faults detected
include open circuits, short circuits, and impedance mismatches.
• Reports the distance to fault to within 1 meter.
• Detects and reports pair swaps, pair polarity reversals, and excessive pair skew.
The TDR test is supported on the following ACX routers and interfaces:
• On ACX1000 routers, 4 RJ45 (Cu) ports or 8-port Gigabit Ethernet MICs with small
form-factor pluggable (SFP) transceivers and RJ45 connectors.
• On ACX1100 routers, 4-port or 8-port Gigabit Ethernet MICs with SFP transceivers and
RJ45 connectors.
• On ACX2000 routers, 8-port Gigabit Ethernet MICs with SFP transceivers and RJ45
connectors.
• On ACX2100 and ACX2200 routers, 4-port Gigabit Ethernet MICs with SFP transceivers
and RJ45 connectors.
• On ACX4000 routers, 4-port, 6-port, or 8-port Gigabit Ethernet MICs with SFP
transceivers and RJ45 connectors.
Copyright © 2017, Juniper Networks, Inc.1330
ACX Series Universal Access Router Configuration Guide
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