[c-nsp] G.703 Unstable behavior

[Junaid]

Hi,

Well, clocking source is line on both ends:

A-Side - (7206VXR)
sh controllers e1 6/7
E1 6/7 is up.
  Applique type is Channelized E1 - balanced
  No alarms detected.
  alarm-trigger is not set
  Framing is UNFRAMED, Line Code is HDB3, Clock Source is Line.
  Service type is Data.
  Active xconns: 0
  Data in current interval (19 seconds elapsed):
     0 Line Code Violations, 0 Path Code Violations
     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Data in Interval 1:
     0 Line Code Violations, 0 Path Code Violations
     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Total Data (last 1 15 minute intervals):
     0 Line Code Violations, 0 Path Code Violations,
     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

B-Side (2621XM)
sh controllers e1 0/0
E1 0/0 is up.
  Applique type is Channelized E1 - balanced
  No alarms detected.
  alarm-trigger is not set
  Version info Firmware: 20051006, FPGA: 20, spm_count = 0
  Framing is UNFRAMED, Line Code is HDB3, Clock Source is Line.
  CRC Threshold is 320. Reported from firmware  is 320.
  Data in current interval (334 seconds elapsed):
     0 Line Code Violations, 0 Path Code Violations
     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

<some lines omitted for brevity>

  Total Data (last 24 hours)
     2556 Line Code Violations, 0 Path Code Violations,
     20 Slip Secs, 0 Fr Loss Secs, 1061 Line Err Secs, 1 Degraded Mins,
     1076 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 2307 Unavail
Secs


I did not specify clock source in the config but I guess clock source is set
to line by default. However, please note that E1s do not start flapping
continously. They work fine for hours, flap once/twice and then back up for
hours again.



On 4/23/07, Daniel Hooper <dhooper at emerge.net.au> wrote:
>
>
>
> ________________________________
>
> From: cisco-nsp-bounces at puck.nether.net on behalf of Junaid
> Sent: Mon 4/23/2007 3:18 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] G.703 Unstable behavior
>
>
>
> Hi,
>
> I am having serious issues with G.703 WAN cards installed in cisco routers
> (3845,2600,3640). The underlying media is E1 and the other end is
> PA-MCX-8TE1 or PA-MC-8TE1 (on cisco 7200). The problem I am facing is that
> the interfaces flap a lot. I have tested the media thoroughly and found it
> very stable. However, when the E1 is terminated on router (G.703), the
> serial interface flaps - not continously but around 10-15 times in 24
> hours.
> Similar behaviour is depipcted by all such installations. One of our
> guesses
> was that this was due to grounding issue but one of our sites has got very
> stable grounding but it is still shows this behavior. Also, if we use E1
> via
> a Pandatel converter, the issue disappears.
>
> Any idea what the issue could be? Does any of you have a similar
> experience
> with G.703 modules?
>
> Regards,
> Junaid.
>
>
>
>
> only the obvious of the clock source, possibly something in the middle
> (carrier / telco or a mux) is supplying the clock source? clock source line
> should go on the controllers in the config
>
> sh controllers E1 0/0 and check for error's.
>
> I've noticed that sometimes if you get the clocks wrong the circuit will
> run fine for hours and then all of a sudden start flapping and you'll see
> your serial interfaces go and up down.
>
> cheerio
>
>
>
> dan
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