gnu@hoptoad.uucp (John Gilmore) (03/16/86)
In article <12900003@svo.UUCP>, corey@svo.UUCP writes: > It has two modes of operation. The first is Microcom's "SX" mode which > has some very nice features such as independant speeds on the RS-232 > line and the phone line. This is a blessing for all of those people > out there without source since you can set the terminal line speed to 9600 > and let the modem take care of the conversion to 300, 1200 or 2400. I don't understand this. What happens if you start outputting at 9600 baud to your modem but it only runs 1200 over the phone line? Whether it throws away data, inserts ^S and ^Q into your incoming data stream, or requires hardware flow control, all of these sound like major drawbacks. If on the other hand these modem mfrs have invented infinite sized buffers, well, more power to them -- and when can I get a random-access version? -- John Gilmore {sun,ptsfa,lll-crg,ihnp4}!hoptoad!gnu jgilmore@lll-crg.arpa
baron@transys.UUCP (Joe Portman) (03/18/86)
> In article <12900003@svo.UUCP>, corey@svo.UUCP writes: > > It has two modes of operation. The first is Microcom's "SX" mode which > > has some very nice features such as independant speeds on the RS-232 > > line and the phone line. This is a blessing for all of those people > > out there without source since you can set the terminal line speed to 9600 > > and let the modem take care of the conversion to 300, 1200 or 2400. > In article <623@hoptoad.uucp> John Gilmore writes: > I don't understand this. What happens if you start outputting at 9600 > baud to your modem but it only runs 1200 over the phone line? Whether > it throws away data, inserts ^S and ^Q into your incoming data stream, > or requires hardware flow control, all of these sound like major drawbacks. > If on the other hand these modem mfrs have invented infinite sized buffers, > well, more power to them -- and when can I get a random-access version? There is a slight misunderstanding going on here. I have the AX- 2400 modem running and here is how it works. Depending on the model you have, Ax-2400c (data compression) or the more advanced model(AX-2400?) you CAN set the modem to 2400 baud on the phone line and 4800 (9600) baud on the serial port. You also MUST BE IN "RELIABLE" (auto error correcting) MODE, as this enables the data compression. You will have to set some flow control (maybe). If you are mainly passing ascii data (as we do) then the modem achieves enough data compression using a mimimum redundancy scheme in hardware to allow the port to run WIDE OPEN most of the time. We have not tested it at 9600 (yet) but it works flawlessly at 4800. As for flow control, either the software (uucp in our case) or the hardware will handle it. We have actually run 4800 without hardware flow control using uucp. If it becomes a problem, the AX- 2400 is configurable to use DTR, CTS-RTS (both ways) and/or XON-XOFF. My personal choice is CTS- RTS, as it has proven the most reliable in past experience. The ONLY gripe I have with the AX-2400 is if you boot your machine or lose power, then you will have to MANUALLY reset the modem by pressing the reset button in the back. Disclaimer: I am not now, nor ever have been, nor probably ever will be affiliated with Microcom. These opinions are solely my own. Joe Portman V.P. Software Developement TransSystems Incorporated 1280 116th Avenue NE Bellevue WA 98009 1-206-453-5560 ihnp4!{uw-beaver!,microsoft!}tikal!{teltone!,camco!}transys!baron