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Re: (ASCEND) Weird Max1800/Stac phenomenon

I have two Max 1800's, one of which has 8-BRI lines
all loaded with permanently dialed connections.

I had seen this before, and still in Rel 5.0Ai13, 
and thought it was a clock problem stemming from 
the 1800 using a single incomming line's clock
as the transmit clock on all lines, and could usually 
correct the packet loss by disabling the first two lines,
to cause the clock source to move to line three, the reenabling 1 and 2.

To test your solution, I rebooted my 1800 to cause clock to go back to line 1,
saw that there was packet loss, and then turned off STAC on all
connection profiles and bumped them offline. 
I am still seeing data lost at the telco level, (suspected clocking sync)
but with no compression the IP packets seem to get retransmitted,
and at the IP network level my applications never see the loss.

If you can get ascend support on the case in the next two weeks,
they can take a look at my system as well, after that 
my PRIs should be installed and the 1800 will be taken offline.

-Jim H

At 17:05 08/11/1997 +0200, Andre Beck wrote:
>before eventually opening a TR for this now that we can reproduce it
>reliably. We drive several S0 leased lines from a central Max1800.
>There are P50s at the other ends, with Leased/Unused configurations.
>The lines use MPP, LQM and usually worked great. However, we recog-
>nized some small to medium packet loss on the lines when doing ping
>probes and an occasional sluggishness with TCP traffic. All these
>symptoms go instantly away as soon as we _disable_ Stac compression
>on these lines. We first had the impression that the impact of the

>Has anyone seen such phenomenon yet ? We were repeatedly told that the
>1800 has no known problems of this kind, but we have observed them in
>several cases with different units but couldn't really reproduce it when
>needed. 

----
Jim Howard             Sr Network Engineer        Lyceum Internet
jhoward@lyceum.com     http://www.lyceum.com/     404.248.1733     

My PGP Public Key: http://www.lyceum.com/~jhoward/pgp-key.txt
Public Key Fingerprint: 7E8B E2BA 1314 2535 CB08  CFF9 119B 7CD3 2488 954D

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