More details on this particular case:
He has a Pentium 133 running Windows 95, and 16550 UARTs. When
connecting with PPP, he gets _very_ slow transfers and 20%-80% packet
loss.
He contacted Adtran and they dialed in to his TA and transfered a file
with Hyperterminal and Zmodem, getting around 7000 CPS. Simulating
this procedure, I had him dial in to his shell account and use sz to
send a large file with Zmodem. He immediately got a bunch of "bad
packets", and the transfer eventually aborted. This would explain why
the PPP connection was so slow; characters and probably being dropped
or mangled somewhere.
Based on this, I'm considering the following possibilities (in no order):
There is a bug in the PM3, possibly in some obscure ISDN option that
he's using (this is the kind of customer who changes all of his settings
before even starting).
There is an incompatability, similar to the above, but Adtran's fault.
Bell Atlantic has provisioned his ISDN line incorrectly, as they are
wont to do. It worked with the Adtran tech because it was a long-distance
call and therefore routed differently.
Some settings changed between his successful test with Adtran and his
unsuccessful tests with us, but the packet loss is neither Adtran
nor Livingston, nor Bell Atlantic's problem. This is very unlikely.
I'm leaning toward the BA hypothesis, though it's pretty hard to get them
to try to find a problem like this. If nobody else has encountered
a problem like this, I think I'll need someone from Livingston to do
a low-level ISDN debug and try to find out where the corruption is
happening.
--
Christopher Masto <chris@netmonger.net>
Director of Operations, NetMonger Communications, Inc.
+1-516-221-6664 http://www.netmonger.net/ info@netmonger.net
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