request diagnostics tdr (ACX Series)
Syntax request diagnostics tdr (abort | start) interface interface-name
Release Information Command introduced in Junos OS Release 12.3X53 for ACX Series routers.
Description Start a time domain reflectometry (TDR) diagnostic test on the specified interface. This
test characterizes and locates faults on twisted-pair Ethernet cables. For example, it can
detect a broken twisted pair and provide the approximate distance to the break. It can
also detect polarity swaps, pair swaps, and excessive 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.
NOTE: We recommend running the TDR test when there is no traffic on the
interface under test.
TDR diagnostics are applicable for copper ports only and not for optical fiber
ports.
You view the results of the TDR test with the show diagnostics tdr command.
Options abort—Stop the TDR test currently in progress on the specified interface. No results are
reported, and previous results, if any, are cleared.
interface-name—The name of the interface.
start—Start a TDR test on the specified interface.
Required Privilege
Level
maintenance
Copyright © 2017, Juniper Networks, Inc.1804
ACX Series Universal Access Router Configuration Guide
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