DelDave
Joined: 16 Dec 2005
Posts: 2
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 Posted:
Fri Dec 16, 2005 1:27 am Post subject:
Excessive Modem Retraining |
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Hoping someone here has an idea.
Up until two weeks ago I have had dial-up server with my 56K modem without any problems. Connect speeds were usually 48K and higher, and rarely did I have nay problems.
Then it started. I started to notice severe speed problems even though my modem still connected at 48K and higher.
The phone company has verified my phone line three times now, and I believe that the analog line is fine.
After looking at the ATI6 and ATI11 modem stats, I found that I had a high number of retrains.
Long story short I have gone through all the troubleshooting techniques. I have connected directly to the NID and capped my connect speed to 14,400 and disabled v.90. Still the modem retrains. My computer connected at my work connects fine to my ISP with no errors or retrains.
I have come across tech doc that talks about the line coding on routers at the Telco possible causing these retrains. It mentions the B8ZS and AMI mis-match on line codes. Anyone out there have any expertise on this. I am getting no where with Verizon in trying to have them check. Could this be causing my problems. |
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DelDave
Joined: 16 Dec 2005
Posts: 2
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Fri Dec 16, 2005 1:34 am Post subject:
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Here is the last ati6 and ati11 stats from my connection:
ati6
U.S. Robotics 56K Voice INT Link Diagnostics...
Chars sent 812499 Chars Received 6494663
Chars lost 0
Octets sent 409360 Octets Received 4323298
Blocks sent 12263 Blocks Received 36694
Blocks resent 308
Retrains Requested 0 Retrains Granted 28
Line Reversals 0 Blers 709
Link Timeouts 36 Link Naks 12
Data Compression V42BIS 2048/32
Equalization Long
Fallback Enabled
Protocol LAPM/SREJ
Speed 493331200
V.90 Peak Speed 52000
Last Call 01:15:42
Disconnect Reason is DTR dropped
ati11
U.S. Robotics 56K Voice INT Link Diagnostics...
Modulation V.90
Carrier Freq (Hz) None/1920
Symbol Rate 8000/3200
Trellis Code None/64S-4D
Nonlinear Encoding None/ON
Precoding None/ON
Shaping ON/ON
Preemphasis (-dB) 7/2
Recv/Xmit Level (-dBm) 19/13
Near Echo Loss (dB) 13
Far Echo Loss (dB) 0
Carrier Offset (Hz) NONE
Round Trip Delay (msec) 10
Timing Offset (ppm) 8671
SNR (dB) 52.5
Speed Shifts Up/Down 27/0
Status : uu,5,12N,12.4,-7,1N,0,50.0,16.1
OK |
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