pjh@mccc.edu (Pete Holsberg) (04/09/91)
A computer magazine recently tested a number of communications programs at various speeds and published the results. They said that at higher transfer rates (57.6K and 115.2K), they used RTS/CTS handshaking because (I'm paraphrasing) that's what you had to use when you had high speed modems. This puzzled me because I've been using Trailblazers at their maximum speed for a couple of years now, with either no or XON/XOFF handshaking. Could someone enlighten me? Thanks, Pete P.S.: Trenton Computer Festival is NEXT WEEK!! -- Prof. Peter J. Holsberg Mercer County Community College Voice: 609-586-4800 Engineering Technology, Computers and Math UUCP:...!princeton!mccc!pjh 1200 Old Trenton Road, Trenton, NJ 08690 Internet: pjh@mccc.edu Trenton Computer Festival -- 4/20-21/91
aronb@gkcl.ists.ca (Aron Burns) (04/09/91)
In article <1991Apr8.173125.22219@mccc.edu> pjh@mccc.edu (Pete Holsberg) writes: >at various speeds and published the results. They said that at higher >transfer rates (57.6K and 115.2K), they used RTS/CTS handshaking because >(I'm paraphrasing) that's what you had to use when you had high speed Many devices don't respond quickley to an XOFF request, so the buffer on the requesting device overflows with resultant data loss. This is particularly true of the UART built in to microcomputers. Some smart i/o cards respond to XOFF quickly enough to do software flow control at high data rates. The modem also has to respond quickly. If it all works, you can save some money on cabling :-). Aaron Burns "Nothing I say on the net is binding aronb@gkcl.ists.ca to our corporation" Toronto, Ontario "Life is a forge, and the purest metal (416)438-6650 x317 comes from the hottest fire"
pjh@mccc.edu (Pete Holsberg) (04/10/91)
In article <21301@ists.ists.ca> aronb@gkcl.UUCP (Aron Burns) writes: =In article <1991Apr8.173125.22219@mccc.edu> pjh@mccc.edu (Pete Holsberg) writes: =>at various speeds and published the results. They said that at higher =>transfer rates (57.6K and 115.2K), they used RTS/CTS handshaking because =>(I'm paraphrasing) that's what you had to use when you had high speed = =Many devices don't respond quickley to an XOFF request, so the =buffer on the requesting device overflows with resultant data loss. =This is particularly true of the UART built in to microcomputers. = =Some smart i/o cards respond to XOFF quickly enough to =do software flow control at high data rates. The modem =also has to respond quickly. If it all works, you can save =some money on cabling :-). They did their tests with null modems, and several of the comm programs that choked with RTS/CTS turned on had excellent data transfer rates with RTS/CTS turned off. What does this tell us? Pete -- Prof. Peter J. Holsberg Mercer County Community College Voice: 609-586-4800 Engineering Technology, Computers and Math UUCP:...!princeton!mccc!pjh 1200 Old Trenton Road, Trenton, NJ 08690 Internet: pjh@mccc.edu Trenton Computer Festival -- 4/20-21/91