Jeff McAdams wrote: "Can you share with us what's causing it (assuming you know of course)? I'm only just now beginning to really dig into real modem functionality...I'd be interested in hearing the explanation." Why certainly...will tell you what we know thus far. Depending on the signal level differences (i.e. if the dB down at a certain frequency was at a certain value it would train based on that criteria). Our understanding is that they just tuned the algorithms to attempt V90 connections under conditions that they didn't necessarily feel were the best conditions for V90, for the sake of allowing a V90 connection. They would measure the signal rolloff at certain frequency levels and if the rollover was more than a certain value it would not attempt to negotiate V90. If you were to use a 3com Sportster and dial up to the Ascend unit plugged into the same PRI, it would show a hotter signal at crucial frequencies -- I believe 3com may also have experimented with modifying the signal levels on the DSP modems themselves as well. However still no solution... and the Ascend DOES negotiates V90 in more situations. Ed ----- Original Message ----- From: Jeff Mcadams <jeffm@iglou.com> To: <usr-tc@lists.xmission.com> Sent: Sunday, October 17, 1999 1:02 PM Subject: Re: (usr-tc) 3com V90 Problems Thus spake Ed
Problem is 3com knows about it... and they know what is causing it. However they have thus far refused to resolve it.
Can you share with us what's causing it (assuming you know of course)? I'm only just now beginning to really dig into real modem functionality...I'd be interested in hearing the explanation. -- Jeff McAdams Email: jeffm@iglou.com Head Network Administrator Voice: (502) 966-3848 IgLou Internet Services (800) 436-4456 - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.