Problems maintaining connections, please help

Problems maintaining connections, please help

Post by John Nava » Fri, 17 Sep 1999 04:00:00

[POSTED TO comp.dcom.modems]

Your connection was actually at 31200.  What's killing you is that your
modem is trying to retrain excessively, 8 times in only 8 minutes.  It
looks like the quality of your phone line has gone to hell.  Try the
3Com/USR Line Test to see if that works any better.

>I've been having problems with my connection to my ISP for the last
>couple of weeks and I hope someone can help me. I'm using a US
>robotics 56K external modem and connecting to Mindspring here in
>Atlanta. I believe that they are also using USR products so hopefully
>there aren't any incompatibilities in software.

>The problem is that for the last couple of weeks I've been having very
>unreliable connections. Up until then I'd be able to make connections
>of about 49k without much trouble. Then the trouble started with
>connections that would die after midnight and an inability to make
>good connections until the next morning.

>When I was disconnected late at night I would try to dial back up and
>would either not be able to connect or would connect at 33k or 21k and
>could not get a faster connection until the next morning. For the last
>few days I'm finding more problems such as disconnects and poor
>connection speeds at any time of the day.  I spoke to Mindspring and
>BellSouth and both companies say that there isn't any problem as far
>as they can detect and they aren't doing any sort of testing that
>could cause the problems I'm seeing. Bell South even sent a
>representative out to my apartment and he said that there were no
>problems that he could find. He also told me that I'm on a SLC so I
>won't have the option of using the ADSL service that Mindspring is
>supposed to start offering tomorrow. :<

>The following is the output from my modem after a 49333 connection
>that disconnected after a short while. I had already been disconnected
>from another 49333 connection once before tonight. I hope that the
>information I've provided above and below is enough for someone to
>provide me some pointers on how I can get more reliable connections
>than I have now.  I just connected at 21600 so things are definitely
>not going well with my connections.

>Thanks for any help

>U.S. Robotics 56K FAX EXT Link Diagnostics...

>Chars sent                46150      Chars Received          1196434
>Chars lost                    0
>Octets sent               36638      Octets Received          472789
>Blocks sent                2403      Blocks Received            4583
>Blocks resent               295

>Retrains Requested            0      Retrains Granted              8  <=====
>Line Reversals                0      Blers                        10
>Link Timeouts                11      Link Naks                    31

>Data Compression       V42BIS 2048/32
>Equalization           Long
>Fallback               Enabled
>Protocol               LAPM/SREJ
>Speed                  31200/26400   <================
>Last Call              00:08:58

>Disconnect Reason is Unable to Retrain

>Configuration Profile...

>Product type           US/Canada External
>Product ID:            00178602
>Options                V32bis,V.80,V.34+,x2,V.90
>Fax Options            Class 1/Class 2.0
>Line Options           Caller ID, Distinctive Ring
>Clock Freq             92.0Mhz
>EPROM                  256k
>RAM                    32k

>FLASH date             10/30/98
>FLASH rev              5.0.0

>DSP date               10/30/98
>DSP rev                5.0.0

>U.S. Robotics 56K FAX EXT Link Diagnostics...

>Modulation                  V.34+
>Carrier Freq     (Hz)       1829/1920
>Symbol Rate                 3200/3200
>Trellis Code                64S-4D/64S-4D
>Nonlinear Encoding          ON/ON
>Precoding                   OFF/ON
>Shaping                     ON/ON
>Preemphasis      (-dB)      2/0
>Recv/Xmit Level  (-dBm)     19/13
>Near Echo Loss   (dB)       14
>Far Echo Loss    (dB)       42
>Carrier Offset   (Hz)       8274
>Round Trip Delay (msec)     6
>Timing Offset    (ppm)      9824
>SNR              (dB)       12805
>Speed Shifts Up/Down        0/0
>Status :

>Freq         Level (dB)

>150           57
>300           67
>450           68
>600           69
>750           71
>900           72
>1050          74
>1200          74
>1350          74
>1500          76
>1650          75
>1800          76
>1950          76
>2100          77
>2250          78
>2400          78
>2550          77
>2700          76
>2850          79
>3000          80
>3150          93
>3300          93
>3450          93
>3600          93
>3750          93

Best regards,

      28800-56K Modem FAQ:

1. Help. Modem maintains connection but no activity?

I've got a USR External 56K Voice Fax Modem Pro. It's connected to my Server. I'm using Win Proxy on the server. All settings are correct.  I connect from my workstation and everything is fine. Then after times ranging from 5 minutes to 2 hours. All of a sudden all I get are 404 timeouts, mail connection errors etc. It's as if I'm no longer connected to the internet. Yet the modem is still connected and on line. The only way to fix it is to hang up and redial. Then everything is fine again until it happens again. It happens to my daughters machine on the network too at the same time mine stops, so I know it's something with the server/modem.

What I've done to fix it. Uncheck use FIFO, clear all cache on both server and workstation. Uncheck Hardware flow control and then recheck when I discovered it didn't work. Did the same with error correction. Changed the Port speeds. Put AT&F in "extra settings", then changed everything back, all to no avail. I do have a 50 foot RJ11. I thought this could be the problem, but why aren't I just disconnecting.

Any help would be greatly appreciated. Thanks.

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