cable test - pair 3 and pair 4 showing short

[teja]

Hi fellow users of meraki , 

we  have  a  below connection on port 12 and it is having too many tx discards. Tried  cycle port and  still seeing below output  on cable  test . what could be the reason ?

Port 12: Connected to Kiwi DoorPad

Troubleshooting

Cable test

Testing the cable attached to port 12

Port Link Length Status Pair 1 Pair 2 Pair 3 Pair 4

12

down

44.25 m

OK

ok

ok

short

short

[Brash]

Bad cabling.

For a short, probably poorly terminated at the patch ports but could also just be a bad patch cable.

Start replacing cables or cable testing the runs to confirm

[cmr]

Is something still connected?  It could be a faulty cable or device, or if the port connects at 100Mb or less then you can ignore it as only two pairs are used for data.

[DarrenOC]

As mentioned above - dodgy cabling. First try replacing the patching fly leads.

[amabt]

Definately doggy cables and or not fully pushed in.

BTW that length (where fault) is not to be trusted in my experience.

[cmr]

@amabt the length is the cable length, not the distance to the fault (if they are not the same).  I've found it to be good +-10% over the years.