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cable-diagnostic tdr test

can someone please explain the channel significance on these test? one port shows A, B, C, D and the other B, A, D, C

TDR test last run on: October 15 10:06:10

Interface Speed Pair Cable length Distance to fault Channel Pair status

--------- ----- ---- ------------------- ------------------- ------- ------------

Gi13/5 1000

1-2 57 +/- 20 m N/A Pair B Terminated

3-6 54 +/- 20 m N/A Pair A Terminated

4-5 59 +/- 20 m N/A Pair D Terminated

7-8 55 +/- 20 m N/A Pair C Terminated

TDR test last run on: October 15 10:07:14

Interface Speed Pair Cable length Distance to fault Channel Pair status

--------- ----- ---- ------------------- ------------------- ------- ------------

Gi10/12 auto

1-2 18 +/- 6 m N/A Pair A Terminated

3-4 18 +/- 6 m N/A Pair B Terminated

5-6 19 +/- 6 m N/A Pair C Terminated

7-8 19 +/- 6 m N/A Pair D Terminated

1 REPLY
Silver

Re: cable-diagnostic tdr test

The Channel field was added to display the pair designation. The

pairs are named based on the transmission channel in use (as per IEEE

specification clause 40.8)

MDI:

Pair A: Pins 1 and 2

Pair B: Pins 3 and 6

Pair C: (if used) Pins 4 and 5

Pair D: (if used) Pins 7 and 8

MDIX:

Pair A: Pins 3 and 6

Pair B: Pins 1 and 2

Pair C: (if used) Pins 7 and 8

Pair D: (if used) Pins 4 and 5

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