How do I confirm good clocking on SONET on a Cisco router?

We had to juryrig a SONET connection over an ATM interface on a 3950 router.  Initial packets are fine, but long dataflows are always disrupted, even for NetCat-UDP.  I suspect timing issues.  What commands and debug statements are best?
jimmycherAsked:
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harbor235Connect With a Mentor Commented:

Right, so on one side define clocking as internal and the other should be on line.You can also do internal internal, try them both and see what provides teh best results
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jimmycherAuthor Commented:
That would be a 3945 router, vice 3950, sorry.  How do I setup one router as the "master" timing?
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harbor235Commented:


"show controller pos x/x" or something like that, you want to look at the output, specifically the NSE and PSE counters. (NSE = negative stuff events, PSE=positive stuff events)

here is a good sonet tining troubleshooting guide:

http://www.cisco.com/en/US/tech/tk482/tk607/technologies_tech_note09186a008009464b.shtml

harbor235 ;}
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harbor235Commented:


timing should be provided as part of the service on the line.

int pos 1/2
clock source line

harbor235 ;}
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jimmycherAuthor Commented:
Thanks Harbor235,
Our carrier says they are NOT providing clocking, but my "show controllers ATM" says
"clock source = line"
(Sadly, we are forcing SONET data over an ATM interface, which was not our choice.)
I have NTP on my side, and I believe the remote does as well, but my guess is that only one should be master, yes?   How do I do that?
What would the command "ATM clock internal provide"?
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harbor235Commented:


While overall time syncronization is something you need to ensure is utilized it is not the same thing as timing on a point to point link. On a P2P link each side must be syncronized for sending and receiving data from the other, you do not want to be sending while expecting receiving, the actual offical time of day is not necessary. The key is that some time is used and that both ends agree that one is the source of time to ccordinate for sending and receiving frames between them.

So, make sure one side has the interface set to providing time and the other side is configured to use time off the line.

harbor235 ;}
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jimmycherAuthor Commented:
My research indicates the default is timing is off the line.  The only other option is clock internal.  IF the carrier says it is not providing clocking, what next?   Should one side be "internal" and the other side "liine" ?
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