Windows modem driver speed

[Zosimos]

I've got a WEIRD problem with serial port speed and an external modem. My modem is a USR Sportster 33.6 Faxmodem and I've been using it successively with Win 3.1, Win 95, and now Win 98. Note, these were each SEPERATE installs, not upgrades, so I don't see how it could be a driver being carried over. The serial port is at 115200 already. And this works ok as long as the modem is set for 57600, NOT 115200. The various settings have been properly tuned and I get almost max throughput (up to 57600) all the time. But, the modem is rated to be able to handle 115200 and it WORKS at that speed with DOS applications. If I could get it to work at that speed in Windows I'd get the full benefit of the compression. I've been struggling with it on and off for years, but it's never worked at this speed. If I tell Windows to address the modem at 115200 the throughput gets completely trashed. I get 800-1000 cps at best. The modem lights flicker slowly, as if it's getting the data at full speed but has to halt because it cannot get it into the computer, while they flicker very quickly at the 57600 setting and the data flows smoothly. I've tried all sorts of settings, checked the port speeds and all windows settings dozens of times. I've tried every vaguely compatible driver. Nothing helps. Set the modem speed back to 57600, and it kicks booty again, up to that 57600 limit! I want the 115200, but something in Windows won't accept that this modem can do 115200 even if I set it in Windows own config dialogues. There must be a registry setting or something that is causing this bottleneck? Oh, I do know about the need to use &W to reset the modem baud rate in NVRAM. Even this does not help. I can set the modem to use 115200 internally but windows still cannot deal with it unless it is told to use 57600. With the MODEM and PORT at 115200, but the Windows driver at 57600, I get almost maximum throughput all the time. This tells me that I could be getting much MORE throughput than 57600 if Windows would deal with the modem at 115200. ?????

 

[thadwalt]

Well sounds like to me that the computer and the port and that modem. That almost maximum will probably be all that you can out of it. Because the setting you need for your stuff to be at maximum you would need a faster computer.

 

[Spiggsy]

Don't want to sound like an old grump but ..... If it's not broke, don't fix.

Have you checked with your ISP or with whoever runs the RAS whether their analogue supports this rate ?

Other than that...snake eyes...no idea. Sorry.