We have seen only once this problem(Exactly) with one of our clients. The
location
is far away suburb. Strangely moved to next door neighbour works
perfectly.
Never got a chance to figure out why.
James
----------
> From: Eric Fagan <mailserve@pdqnet.net>
> To: NT-ISP <ntisp@emerald.iea.com>
> Subject: Slightly off-topic: modem troubles
> Date: Thursday, April 02, 1998 7:13 AM
>
> Hello: This req for help only applies to anyone with telecom experience
(or
> good working knowledge of modem comms) - Other people can probably ignore
> this, thx.
>
> One of my pops in a US West area is having severe difficulties
> establishing error-free connections between modems. We've got Hayes
Century
> II-16's, MR200 analogs, & stand-alone Cardinal MVP-33.6 modems at this
site.
> All are configured with manufacturer recommended init strings for ISP's.
> For unknown reasons, client modems attempting to establish carrier with
> these modems do not connect correctly and are forced into connecting
without
> error correction on 40-60% of the calls. This issue arises once every
> several months and lasts from 3 days to a month. The 28.8 or 33.6 client
> modems are configured in win95 with standard "error free connection,
> compress data" -- no deviation from the defaults. The modem sounds as
if
> it is handshaking normally -- however, after the modem mutes, (usually
the
> point at which you receive a "connect" message), there is a 5-10 second
> pause in which nothing happens. After the pause, the "connect" message
> appears followed by streaming garbage. This affects all client modems,
from
> cheapies to USR's.
> Win95 always interprets this the same: It will show "status: dialing"
> while handshaking, and then continue to show that message for several
> seconds after the modem mutes (not normal). It'll switch to "verifying
> username & password" for a few secs & then die with "unable to negotiate
a
> compatible set of network protocols," etc. Sometimes the client modem
> becomes totally unusable after this happens and will not connect to
anything
> again until it is powered down & brought back up.
> US West says the lines are clean -- I've looked at the results myself.
> Low loss, background noise, etc. However, these tests they perform only
> test from the pop to the switch -- they refuse to do an end-to-end. I
> highly suspect that the problem is in the switch -- perhaps
overmodulation,
> or .???
> Anyway, apologies for posting this on the NT-ISP list -- it's more
> general-ISP, but I'm out of options. This latest bout has been going on
for
> weeks. If anyone has any suggestions or experience with this, please
email
> me off-list.
>
> Eric Fagan
> mailserve@pdnqet.net
>
>
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