gandrews@netcom.COM (Greg Andrews) (05/01/91)
In article <665@mixcom.COM> xeee02@mixcom.COM (Dean A. Roth) writes: > >The 9600SA and T1600 will not make a V.42 or V.42bis >connection, but will make a MNP 5 connection. Both >will make a V.42bis connection with other modems - just >not each other. > I helped someone troubleshoot a connection where a PM9600SA was calling a T1600 (ditto for an Intel 9600EX). We needed to set the PM9600SA to negotiate V.42/V.42bis ONLY, without allowing fallback to MNP. Then they were able to link up. When the T1600 called the PM9600SA, they liked up with V.42/V.42bis without any special settings needed. I concluded that something is different about the way the two modems request V.42, but I couldn't tell exactly what that difference was. > >If I use the T1600 to call the USR, or vice versa, I get >a V.42bis connection. Eventually, though, one of the modems >locks (nothing comes or goes). This behavior has only >been observed between these two modems. > I use a T1600 to talk with Compuserve's USR DS modems almost every day. I haven't noticed any unusual freezeups or disconnections so far... >Dean Roth deanr@mixcom.com -- .------------------------------------------------------------------------. | Greg Andrews | UUCP: {apple,amdahl,claris}!netcom!gandrews | | | Internet: gandrews@netcom.COM | `------------------------------------------------------------------------'
xeee02@mixcom.COM (Dean A. Roth) (05/03/91)
>In article <665@mixcom.COM> xeee02@mixcom.COM (Dean A. Roth) writes: >> >>The 9600SA and T1600 will not make a V.42 or V.42bis >>connection, but will make a MNP 5 connection. Both >>will make a V.42bis connection with other modems - just >>not each other. A PPI tech support person admited to me (over the telephone, not in writing) that the 9600SA has problems talking with a V.32/V.42 Telebit. Another (the third) EPROM is in the mail (release 1.31). The person also said that the older PROMs asserted carrier detect *before* protocol negotiation was completed. That can explain why I have never been able to get a 9600SA to reliably answer calls when attached to a multi port serial board in a UNIX computer. It seems to work O.K. when attached to an MS-DOS computer, though. -- Dean Roth deanr@mixcom.com