I've seen this too. See below.
> I'm pretty sure it's only one modem on a single card, but I am having a
> devil of a time locating it because we only have one dial-in number with our
> incoming channelized t1 service. So, in your opinion, what would the best
> way to locate the bad modem?
"set mX off" all modems that you think are ok.
Now the fun part: when did you buy this card? Our two latest shippments
both had bad card or chasis (not sure yet). The whole story:
1. On one PM3 we could sometimes get very good connects (33600), but only
for a couple of minutes, then the call would drop. Calling in another
time, we'd get 21600 or even worse, with no error correction and just junk
floating up the screen. Calling in again - junk. Calling in again, a nice
33600 connect. Just random. There were absolutely no callers on the
machine and we were always assigned modem M0. Disabling the first couple
of modems (set m0 off, set m1 off, ...) cured the problem. Another cure
was to put the same card into another slot of the same chassis. So where's
the culprit? The card or the chassis?
2. Another occurence happened today, when another fellow ISP called and
told us they have problems with their new PM3, getting dead air when
calling in. The machine only had one card in. They brought the card at our
place and we put it into our PM3 (not the same one as in part 1). After
the usual TEST-ADMIN phase *all* modems on the card went to DOWN. We
removed the card from the slot and put it back in, again all modems went
into DOWN. Took the card out and put it into another slot, disabled all
other modems (on the other cards), could succesfully establish a
connection. So where's the problem? Our (and the fellow ISP's) chassis or
the card?
The fellow ISP both the cards just recently, we have the PM3 in point 2)
for a couple of months new. The PM3 in point 1) is new, delivered to us
about 2 weeks ago. Another box in another location (the first one we got)
was bought about a year ago and it works just fine since day 1.
Am I halucinating or is this a manufacturing error in either the cards or
the chassis?
I have to mention that we already replaced that same box in point
2) earlier, because the box was locking solid after a couple of days of
operation. The replacement box was working just fine from day 1, only now
when we put in this card it seems as if one slot is bad. But I really have
the strange feeling that the modem cards are bad.
Is anybody seeing anything simmilar? Could the ones having connection
trouble maybe try removing the latest modem cards they got (if they bought
them, let's say, in the last month?).
Lucent, have there been any changes in the manufacturing process
for the modem cards or the chassis lately?
This is all on ComOS 3.8b13, haven't tried 3.7.2c3 as 3.8b13 is working
just fine in two locations since it was first released and it's working
fine with all the cards we used, until this new batch. We use EuroISDN
PRI.
For now, I don't think I have enough data to really start bugging Lucent
support, that's why I'm looking here for comments.
I will be collecting some more data and hopefully be able to create a
report to Lucent support.
Blaz Zupan, blaz@medinet.si, http://home.amis.net/blaz
Medinet d.o.o., Linhartova 21, 2000 Maribor, Slovenia
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