02-27-2012 01:53 PM - edited 03-04-2019 03:27 PM
Hi.
Can some one tell me what's the meaning of the output:
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi0/40 100M Pair A 2 +/- 4 meters Pair A Normal
Pair B 2 +/- 4 meters Pair B Normal
Pair C 2 +/- 4 meters Pair C Short
Pair D 2 +/- 4 meters Pair D Short
From the command
test cable-diagnostics tdr int gi 0/40
It's normal?
If not, then. the problem is on the cable or on one of the interfaces?
The interface is connected between a fastethenert on a 2811 router and a 3560-48 switch.
The cable is a straight through cat 5e cable. (I have changed several cables with same result).
Thanks in advance.
Best regards.
Samuel.
Solved! Go to Solution.
02-27-2012 02:13 PM
Can some one tell me what's the meaning of the output:
I can!
Test is taken from a 3560G-48.
Cable length is between 2 to 5 metres. The TDR test can "see" Pair A and B. Unless you are using PoE (Pair "C") then you "shouldn't" be worried about it.
Pair "D" supports GigabitEthernet.
My personal opinion? You've got a crappy cable. I don't care if you don't need to use PoE or Gig interface, I will never (ever) take a cable unless all four pairs are tested Normal.
02-27-2012 02:13 PM
Can some one tell me what's the meaning of the output:
I can!
Test is taken from a 3560G-48.
Cable length is between 2 to 5 metres. The TDR test can "see" Pair A and B. Unless you are using PoE (Pair "C") then you "shouldn't" be worried about it.
Pair "D" supports GigabitEthernet.
My personal opinion? You've got a crappy cable. I don't care if you don't need to use PoE or Gig interface, I will never (ever) take a cable unless all four pairs are tested Normal.
02-28-2012 11:27 AM
Thanks very much for your answer.
Question:
There are any possibility by any chance that one of the physical interfaces, either on the router or the switch is damaged?,
Thanks again.
Regards
02-28-2012 11:31 AM
Thanks very much for your answer.
Question:
There are any possibility by any chance that one of the physical interfaces, either on the router or the switch is damaged?,
Thanks again.
Regards
02-28-2012 01:50 PM
There are any possibility by any chance that one of the physical interfaces, either on the router or the switch is damaged?,
There's a chance but it's very slim. There's another way to determine this. Un-patch the cable from the remote end and run the TDR test again, if you get the same result, i. e. Normal, Normal, SHORT, SHORT, then your cable is faulty.
Just because the remote end does NOT support PoE or GigabitEthernet does not mean that the last two pairs will come back with a bad result.
Another thing, just because your cable came from a fresh pack does NOT mean that all four pairs are expected to work fine. Remember, during the manufacturing of these cable the products COULD BE tested. When they are tested, the TDR the manufacturer will only test the FIRST TWO PAIRS.
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