OSI:Time-Domain Reflectometer

Time-Domain Reflectometer (TDR) na Cisco přepínačích

Command to start the TDR

test cable tdr interface <interface of your choice>

Wait for about 5 to 7 seconds for the test to run

Command to show the result of the TDR test

show cable tdr interface <interface of your choice>

1 Gb/s

Interface   Speed Local pair Pair length        Remote pair Pair status
---------   ----- ---------- ------------------ ----------- --------------------
Gi1/0/24    1000M Pair A     23   +/- 10 meters Pair A      Normal              
                  Pair B     196  +/- 10 meters Pair B      Normal              
                  Pair C     27   +/- 10 meters Pair C      Normal              
                  Pair D     23   +/- 10 meters Pair D      Normal         

100 Mb/s

Interface   Speed Local pair Pair length        Remote pair Pair status
---------   ----- ---------- ------------------ ----------- --------------------
Gi5/0/46    100M  Pair A     50   +/- 10 meters N/A         Normal              
                  Pair B     54   +/- 10 meters N/A         Normal              
                  Pair C     44   +/- 5  meters N/A         Open               
                  Pair D     44   +/- 5  meters N/A         Open        

Vadný kabel

Interface   Speed Local pair Pair length        Remote pair Pair status
---------   ----- ---------- ------------------ ----------- --------------------
Gi1/0/21    100M  Pair A     15   +/- 10 meters N/A         Normal              
                  Pair B     13   +/- 10 meters N/A         Normal              
                  Pair C     16   +/- 5  meters N/A         Short               
                  Pair D     17   +/- 5  meters N/A         Short               

How to use Time-Domain Reflectometer (TDR)