[c-nsp] T3 fixed when cables are reseated..

[billw at waveform.net]

I've seen this a few times in the past with loose connectors. The cause
has generally been either a loose connection on the center pin (usually in
the connector on the card, but sometimes the crimp on the center pin of
the connector isn't tight enough onto the center conductor of the cable).
Occasionally it's a loose ferrule on the connector but that's rare. I have
seen connectors that have a strand or two of the shield that make
intermittent contact to the center pin to cause a short.

Many of these loose connector problems magically disappear when the
connector is either unplugged/replugged or is just "wiggled a little". The
problem is that over time the loose connector will fail again so the real
solution has been to either replace the problem cable or cut off the bad
connector and put on a new one.

  -Bill

> I had this happen a year or two ago on another router on a different card.
> I have a 7206 with a PA-MC-T3 with about 25 T1s go down tonight.   I
> couldn't fix it remotely so I drove to the office to see what was going
> on.
> I unplugged the TX cable and plugged it in and then the same with the RX
> cable.   I went back checked the T3 and all of the T1s were backup.    Has
> anyone had this happen before?   I can't find any clues as to what
> happened.
> My only guess is that the far end is looped when I unplug the cables and
> it
> may reset the far end.
>
>
>
> Richey