Juniper ACX1000 Configuration Manual page 1389

Copyright © 2017, Juniper Networks, Inc.
Chapter 36: Diagnosing Cable States Using Time Domain Reflectometry (TDR)
NOTE: We recommend running the TDR test on an interface when there is
no traffic on the interface.
TDR diagnostics are applicable for copper ports only and not for optical fiber
ports.
To diagnose a cable problem by running the TDR test:
Run the
1. request diagnostics tdr
user@host> request diagnostics tdr start interface ge-0/0/10
Interface TDR detail:
Test status
View the results of the TDR test with the
2.
user@host> show diagnostics tdr interface ge-0/0/10
Interface TDR detail:
Interface name
Test status
Link status
MDI pair
Cable status
Distance fault
Polartiy swap
Skew time
MDI pair
Cable status
Distance fault
Polartiy swap
Skew time
MDI pair
Cable status
Distance fault
Polartiy swap
Skew time
MDI pair
Cable status
Distance fault
Polartiy swap
Skew time
Channel pair
Pair swap
Channel pair
Pair swap
Downshift
Examine the
Cable status
3.
fault. In the preceding example, the twisted pair on pins 4 and 5 is broken or cut at
approximately one meter from the
command.
: Test successfully executed
show diagnostics tdr
: ge-0/0/10
: Passed
: Down
: 1-2
: Normal
: 0 Meters
: N/A
: N/A
: 3-6
: Normal
: 0 Meters
: N/A
: N/A
: 4-5
: Open
: 1 Meters
: N/A
: N/A
: 7-8
: Normal
: 0 Meters
: N/A
: N/A
: 1
: N/A
: 2
: N/A
: N/A
field for the four MDI pairs to determine if the cable has a
port connection.
ge-0/0/10
ge-0/0/10
command.
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