|Forums | USR (Public) | USR5686 stops responding or disconnects||Watch|
|Posted - 7/31/2004 7:04:44 AM |
Didn't want to jack dtc's thread, but my problem is extremely similar.
Several calls to the ISP and to the telco. ISP says there is nothing wrong. Telco sent a guy out three times to check the line. The last time I was here. He hooked in to the demarc and said that noise was <20db. He also told me that the CO had move a few months prior and the line is all fiber optic to about a mile from my house.
Here's where it gets bizarre: the no-response/disconnect incidents usually happen about 4 minutes after the hour, 22 after, and 16 til the hour. This is according to "wall time" regardless what the system clock is set to.
My laptop does not have the problem, using either the built-in modem or a Xircom modem card.
The steps I have taken so far:
I just ordered the Modemsite DSP modem. Who knows? Maybe the external modem is too sensitive to current line conditions. I had a PCChips mobo at one time with a built-in modem that, in town could connect consistently at 50K, but out here in the boonies could only manage 9600, if it could connect at all.
Modem log reports noise levels like this):
The numbers are almost always close to these. Except the estimated noise level. It varies between the teens, as seen here, to over 200.
Anybody got clues?
|Posted - 7/31/2004 9:17:25 AM |
This could be a problem with the serial port itself,most often buffer over run. What OS is on the laptop? Do you have any program running in the background that is connected some way to the connection. Any thing that is checking with aouto update. End task anything that is not needed,check connection.
Some other things to check
Do you have a NIC card and not using it? Check connection/
|Posted - 7/31/2004 1:01:29 PM |
The OS on the laptop is Win2K, SP4, same as on this machine.
I had flashed the "old" external modem. No change. The "new" one is still running the older version firmware.
I'm suspecting noise even more now. During a couple-hour session, I usually get 4 or 5 Error Link Timeouts and the same for NAKs. My receive/transmit levels are notably high, as is the Near Echo Loss (see original post).
Thanks again. I'll keep digging...
|Posted - 7/31/2004 3:51:52 PM |
Have you tested this line with hyperterminal using the ati6
Have you tried the connection with everything disconnected from the phone jacks. Have you tried other phone jacks? Do you hear any cross talk on the phone? Have you tried this string.note the spaces.
|Posted - 8/1/2004 9:38:42 AM |
Take the USR modem & the laptop to other locations (ideally with 1 being at a location served by a different telco central office) and see what happens.
If location you are at has add'l phone lines, try the modem on other phone line. You could also try the USR modem at present location but connected to laptop.
Should help to pinpoint whether problem is related to PC; phone line, etc.
It could be that the telco's change in facilities has 'caused' the problem --
|Posted - 8/1/2004 5:34:05 PM |
There is only one jack for that line. Nothing else is connected. I had the phone line running through my UPS for several months before the problem started. Since then, the line goes directly to the modem and I unplug it when not connected. I'll give the string a try...
|Posted - 8/17/2004 6:31:53 PM |
So far so good. With the Modemsite modem, that is.
The internal modem in the laptop was reporting much lower noise levels than the external USR. So that sort of confirmed my suspicions that the USR was too sensitive to noise on the "upgraded" phone line.
Got the Modemsite modem, hooked 'er up, and everything is everything so far. To prove to myself that the connection was solid, I used VPN to connect to my machine at a client site, checked email there, and used it to administer one of the web servers. All in all, I was connected for three hours, sending/receiving some heavy traffic over the phone line.
Thanks, Richard, for the heads up on the Modemsite modem.
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