Forums | USR | Unable to retrain | Watch |
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timoch Tl Posts: 16 | Posted - 12/24/2001 12:34:31 PM I have a Dell 350 mhz with a USR Sportster internal voice modem flashed to V90. I usually log on at 45333, but, periodically I get cut off. From Hyperterminal I find that the reason is "unable to retrain". Does this problem originate from my modem, the phone line, or from my ISP? The following is the Hyperterterminal log. Thanks. ati6i7i11y11 U.S. Robotics 56K Voice INT Link Diagnostics... Chars sent 1438367 Chars Received 9122606 Retrains Requested 0 Retrains Granted 0 Data Compression V42BIS 2048/32 Disconnect Reason is Unable to Retrain Configuration Profile... Product type US/Canada Internal FLASH date 2/24/98 DSP date 2/24/98 U.S. Robotics 56K Voice INT Link Diagnostics...
Freq Level (dB) 150 23 |
Bob Starnes Tl Posts: 4360 USA | Posted - 12/24/2001 9:50:11 PM Retrains are most often caused by noise on the phone line that causes the modem to lose the carrier, when the carrier is lost the modem attempts to recover it by retraining (renegotiating the connection, just like connecting for the first time), but if the noise on the line is too severe and/or last too long then the modem is "unable to retrain". Don't see any indication of a retrain request in the Link Diagnostics, doesn't even show any speed shifts. Line quality and S/N Ratio look very good. Also not showing any Blers, Timeouts or Link NAKS. Very strange... -Any- noise on your phone line, possibly something intermittant? Might pick up the phone and listen without a dialtone immediately after the disconnect to see if you hear anything. Might try removing all phones and phone line devices from the same line that the modem is on and try a connection with just the modem using the line. Some phone and answering machines have been known to interfere with modems. Could also try the modem on a known good line to see if the same problem occurs, if not then look to the phone line for the cause, if so the the modem may be suspect.
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timoch Tl Posts: 16 | Posted - 12/25/2001 8:06:22 PM Usually, when talking extended periods on the phone, I don't hear extraneous noises nor do I when I dial a single digit to clear the dial tone. One thing my son found when he was visiting us, was quite a bit of RF hum that he picked up with his portable ham radio, originating from a flakey splice on the same utility pole that carries the phone and cable lines. This causes some snow on the lower channels on the cable. The hum seems to be intermittent. A friend who works at the power company looked at the splice, but so far the Co has repaired it. Could that be the problem? Another thing, the hang ups seem to be much more frequent during the day than late at night |
timoch Tl Posts: 16 | Posted - 12/25/2001 8:07:15 PM Usually, when talking extended periods on the phone, I don't hear extraneous noises nor do I when I dial a single digit to clear the dial tone. One thing my son found when he was visiting us, was quite a bit of RF hum that he picked up with his portable ham radio, originating from a flakey splice on the same utility pole that carries the phone and cable lines. This causes some snow on the lower channels on the cable. The hum seems to be intermittent. A friend who works at the power company looked at the splice, but so far the Co has repaired it. Could that be the problem? Another thing, the hang ups seem to be much more frequent during the day than late at night |
Bob Starnes Tl Posts: 4360 USA | Posted - 12/25/2001 8:44:37 PM Could very well be part of the problem but something like a bad power line causing static would more likely just cause low speeds connects if it's coming through the phone line. I'd think there'd have to be a good bit of audible noise on the line to cause the modem to not be able to regain the carrier. Don't know if I'm missing something obvious but given all the good numbers in the Link Diagnostics and the lack of errors, speed shifts and retrains, the "Unable to Retrain" is most puzzling. Perhaps someone else could offer an opinion. |
v.Richard Tl Posts: 6222 USA | Posted - 12/26/2001 8:31:12 AM Unable to retrain - when the diagnostics don't show any retrains requested/granted is unusual. Your modem with non-standard init string, or your ISP's modem can be set to disallow retrains (ie, disconnect if a retrain would otherwise be required). You can test your init string by adding a custom string of &F1 I'd also note the low upstream rate (21.6k) and high downstream (peak over 50k); you might do better by limiting your connect speed - try 48k Aloha, |
timoch Tl Posts: 16 | Posted - 12/26/2001 7:38:36 PM Actually I wish I could try 48k. My upper limit is set for 45333, and it always logs on at that speed. If I leave the extra settings box blank, about 30% of the time it logs on at 49333k then it seems to be a lot slower than at 49333. During the day, the dial up sometimes takes 5-6 tries, late at night it often makes it on the first try.... When I was using IE 5.5 I not only had the disconnect problems, but the browser seemed to fall asleep and I would have to refresh to be able to connect to the next link. I got Opera 5.12, and the latter problem went away. Now I have Opera 6.0, and it sometimes requires hitting the "go" button a couple of times to get it going. |
timoch Tl Posts: 16 | Posted - 12/26/2001 7:45:43 PM The above diagnostics was made immediately after a disconnect. One thing that I noticed on other diagnostics that I have taken after other disconnects is that the SNR is very high, over 4700, with one retrain granted and none requested. I seldom have more than a couple bliers per session: maybe that will help. |
timoch Tl Posts: 16 | Posted - 12/28/2001 5:17:55 AM Here is some additional info about the disconnection. The log on CiDial (a software redialer) when a DC occurrs reads, "error 6 hangup ras hangup". This morning I've had two DC's within 30 minutes. Here is the Hyperterm reading for the last one. I had logged on at 45333. I would appreciate any advice that you could offer. ati6i7i11y11 Chars sent 322724 Chars Received 1227057 Retrains Requested 3 Retrains Granted 0 Data Compression V42BIS 2048/32 Disconnect Reason is Unable to Retrain Configuration Profile... Product type US/Canada Internal FLASH date 2/24/98 DSP date 2/24/98 U.S. Robotics 56K Voice INT Link Diagnostics...
150 23 |
Bob Starnes Tl Posts: 4360 USA | Posted - 12/28/2001 2:05:58 PM Something must have gotten pretty bad: > Speed 12001200 > Modulation V.22 Connect speed down to V.22/1200bps at the time of disconnect. Take your computer to another location and try a connection to your ISP using a known good phone line, see if you can get a better, more stable connection. If so then there's something on your phone line causing the problem, if the problem still exist using a different phone line then the modem may be about to go south. |
v.Richard Tl Posts: 6222 USA | Posted - 12/31/2001 12:29:08 PM You might also try connecting modem directly to your phone line demarc or removing all other devices - www.modemsite.com/56k/demarc.htm As Bob says, that last diag indicates something really bad - and iot may be your modem.... (although it could be your ISPs modem or the combination....) Aloha, |
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