[c-nsp] Debugging T1 Bounces on CT3

[Greg Boehnlein]

On Sat, 13 Aug 2005, Bill Wichers wrote:

> > In any case, these are VERY CLEARLY LCVs at the DS3 level, more
> > specifically, RX LCVs at the Cisco end. The Far End (MX-2800) shows no
> > LCVs.
> 
> I think you have some defective/damaged equipment in your system. If
> you've already replaced the cables then it's probably either one of the
> BNC connectors on the units or something internal.

But we've replaced the MUX, the Cables -AND- the PA-MC-T3 cards on the 
cisco. Basically, everything!!

> I've seen corrosion inside the BNC center pin cause problems, but a few 
> plug/unplug cycles will usually clear that. I've also seen the 
> receive-side matching transformers on the Cisco DS3 PA's get damaged 
> electrically (not sure exactly how), which has resulted in strange 
> problems for me in the past
> (usually causes similar problems to running a far too long DS3 cable run).
> If you have a spare PA-MC-T3 and a spare mux, try trading them out one at
> a time and see if the problem is in one of the devices. Normally DS3 links
> aren't so picky about minimum lengths of cabling, IMHO.

Aain, we did that. We replaced everything!

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