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| Forums | USR | 3CP5610A with V90 bad throughput | Watch |
| Author | Topic |
| evargas Tl Posts: 3 USA | Posted - 10/30/2001 12:29:26 PM    I am having a hard time getting my 56K Performance Pro 3CP5610A to work with Bellsouth using V90. Their modems support V90, my line is good has been check by telco and is in optimal conditions. My problem is throughput always below 10 Kbps. With V90 enabled it CONNECT 49333/ARQ/V90/LAPM/V42BIS, to my knowleadge it connects with everything they way to should be, but the throughput is very slow. Look my ping to Bellsouth router: Reply from 209.215.205.88: bytes=32 time=631ms TTL=254 Approximate round trip times in milli-seconds: With V90 disabled it CONNECT 33600/ARQ/V34/LAPM/V42BIS, only 33.6 kbps ofcourse but check my throughput to the the same router: Reply from 209.215.205.88: bytes=32 time=130ms TTL=255 Approximate round trip times in milli-seconds: Here is my ATI6I11Y11 for V90 enabled and after the pings: U.S. Robotics 56K FAX INT Link Diagnostics... Chars sent 1714 Chars Received 838 Retrains Requested 0 Retrains Granted 0 Data Compression V42BIS 2048/32 Disconnect Reason is DTR dropped U.S. Robotics 56K FAX INT Link Diagnostics...
Freq Level (dB) 150 19
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| Bob Starnes Tl Posts: 4360 USA | Posted - 10/30/2001 10:30:32 PM Pinging has nothing to do with connect speed. At most the only relation pinging has to do with the modem is if the data is corrupted and the modem is requested to resent the packet and this can happen at any speed or protocol. If you want to check throughput for the modem the download a .zip file of at least 300K and note the speed at which the file downloads, it should be approximately 10% of the connect speed. For example, connected at 45333bps, downloads should be about 4.5K/Sec to 4.6K/Sec. If the download speed is considerably less than 10% of the connect speed then you may need to limit the max connect speed to something less that 45333bps (say 44000 or 42666) in order to increase the throughput. |
| evargas Tl Posts: 3 USA | Posted - 10/31/2001 11:30:40 AM What the pings reflect is that with V90 the ping takes more time to travel from my computer to the router at the other end. Its clearly demostrated that with V90 there is a latency. I have run a couple of download tests and here are the results: WS_FTP LE (691K) downloaded from ftp1.ipswitch.com: PDF document (574K) downloaded from ftp.bellsouth.net: TIA, Ernesto |
| Bob Starnes Tl Posts: 4360 USA | Posted - 10/31/2001 10:09:01 PM The only thing the pings are possibly showing is that with the V.90 speed you're connecting at you're getting a lot of resent packets, try lowering the connect speed to something less than 45333bps, say 44000 or 42666 and then check the throughput again. |
| evargas Tl Posts: 3 USA | Posted - 11/1/2001 6:59:44 AM I think I have found my problem. Looks line my phone line is not getting above normal DC votalge only 40 V DC and I get a huge amount of noise on the line. Modulation V.90 |
| Bob Starnes Tl Posts: 4360 USA | Posted - 11/1/2001 1:42:24 PM > Recv/Xmit Level (-dBm) 19/13 Recv and Xmit Levels look ok at the moment. > SNR (dB) 43.1 Excellent Signal to Noise Ratio Not sure about your phone line voltage levels but if you have -any- audible noise on the line it will interfer with the connection. See http://modemsite.com/56k/diag3com.htm for interpretting the ati6i11 data |
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