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TDR Copper Cable Testing in CX 6300

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  • 1.  TDR Copper Cable Testing in CX 6300

    Posted May 01, 2020 03:57 AM

    As a general rule of thumb, it is a good idea to start troubleshooting at Layer 1 and work your way up the stack. There are occasions when you just can't get to site, and testing L1 - including cabling - can be a challenge.

     

    TDR

    This is where the TDR (time domain reflectometer) comes into play. The TDR is built-in to the latest Aruba CX 6xxx switches (RJ45 ports only). That includes:

    • 6200
    • 6300F/M
    • 6400

    Console Commands

    Some examples of the command "diag cable-diagnostic n/n/n" on a CX6300F 24 port POE switch. Ensure you enable diagnostics mode first, otherwise the diag command will not be available.

     

     

     

    CX6300# diagnostics
CX6300# diag cable-diagnostic 1/1/5
This command will cause a loss of link on the port under test
and will take several seconds to complete.
Continue (y/n)? y
           MDI    Cable          Distance   MDI
Interface  Pair   Status         to Fault   Mode
                                 (Meters)
-------------------------------------------------
1/1/5      1-2    good           8          mdix
           3-6    good           5          mdix
           4-5    open           2          mdix
           7-8    open           2          mdix
CX6300# diag cable-diagnostic 1/1/12
This command will cause a loss of link on the port under test
and will take several seconds to complete.
Continue (y/n)? y
           MDI    Cable          Distance   MDI
Interface  Pair   Status         to Fault   Mode
                                 (Meters)
-------------------------------------------------
1/1/12     1-2    good           11         mdi
           3-6    good           11         mdi
           4-5    good           11         mdi
           7-8    good           11         mdi
CX6300# diag cable-diagnostic 1/1/13
This command will cause a loss of link on the port under test
and will take several seconds to complete.
Continue (y/n)? y
           MDI    Cable          Distance   MDI
Interface  Pair   Status         to Fault   Mode
                                 (Meters)
-------------------------------------------------
1/1/13     1-2    good           11         mdi
           3-6    good           11         mdi
           4-5    short          2          mdi
           7-8    short          2          mdi

     

     

    • 1/1/5 = old MSM410 AP running as a remote client
    • 1/1/12 = HP Lync Phone
    • 1/1/13 = dodgy IP camera

    I also tried one of the SFP56 ports (connected with a 1m DAC), and as expected, it was not supported.

     

     

    CX6300# diag cable-diagnostic 1/1/27
Cable diagnostic not available on this port

     

     

     

    Previous Posts

    I have posted several times previously about the TDR in the ArubaOS-Switch devices, you can find those posts here: