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Forums | USR | Very high Near Echo Loss=65535

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Spock Tl Posts: 2	Posted - 7/17/2000 9:26:02 PM I have checked this with two separate ISP's and it is the exact same number. Is this a modem reporting error or is there a major problem at my telco? Freq Level (dB) 150 18 300 16 450 15 600 15 750 15 900 15 1050 15 1200 15 1350 15 1500 15 1650 15 1800 15 1950 15 2100 16 2250 16 2400 16 2550 16 2700 16 2850 16 3000 17 3150 17 3300 19 3450 21 3600 25 3750 32 OK ati6 U.S. Robotics 56K Voice INT Link Diagnostics... Chars sent 18 Chars Received 407 Chars lost 0 Octets sent 11 Octets Received 277 Blocks sent 11 Blocks Received 41 Blocks resent 0 Retrains Requested 0 Retrains Granted 0 Line Reversals 0 Blers 0 Link Timeouts 0 Link Naks 0 Data Compression V42BIS 2048/32 Equalization Long Fallback Enabled Protocol LAPM/SREJ Speed 44000/31200 V.90 Peak Speed 44000 Last Call 00:00:37 Disconnect Reason is DTR dropped OK 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) 20/13 Near Echo Loss (dB) 65535 Far Echo Loss (dB) 0 Carrier Offset (Hz) NONE Round Trip Delay (msec) 4 Timing Offset (ppm) -2718 SNR (dB) 42.4 Speed Shifts Up/Down 0/0 Status : uu,5,12N,12.2,-0,1N,0,41.8,22.0 OK
v.Richard Tl Posts: 6222 USA	Posted - 7/19/2000 9:35:03 AM The 65,535 is not a valid # - it is the decimal value of 2 bytes (16bits) that are all 1's - or HEX(FF)= 65,535 Either the modem isn't reporting the value correctly, or the register is only valid during a connection: use HyperTerminal to dial in, use the +++ escape sequence to go to command mode while still on line, then examine the i11/echo loss values. Aloha, Richard
Spock Tl Posts: 2	Posted - 7/20/2000 9:24:43 PM Ok did what you said. This is what I got from the first ISP: 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) 20/13 Near Echo Loss (dB) 65535 Far Echo Loss (dB) 0 Carrier Offset (Hz) NONE Round Trip Delay (msec) 4 Timing Offset (ppm) -2886 SNR (dB) 39.6 Speed Shifts Up/Down 0/0 Status : uu,5,12N,12.3,-0,1N,0,40.7,24.5 and this is what I got from the second: 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) 6/6 Recv/Xmit Level (-dBm) 20/12 Near Echo Loss (dB) 0 Far Echo Loss (dB) 0 Carrier Offset (Hz) NONE Round Trip Delay (msec) 17 Timing Offset (ppm) -2792 SNR (dB) 40.3 Speed Shifts Up/Down 0/0 Status : uu,5,12N,12.3,-0,1N,0,40.9,23.1
v.Richard Tl Posts: 6222 USA	Posted - 7/21/2000 5:36:23 PM Well, assuming the modem is otherwise working properly, I wouldn't be too worried.... could be something overlooked when 3Com did the code for your modem - it appears not to be delivering a real measurement of near echo loss.... Aloha, Richard

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