Newsgroups: comp.sys.sun.admin Path: usenet.ee.pdx.edu!insosf1.infonet.net!yeshua.marcam.com!MathWorks.Com!europa.eng.gtefsd.com!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!decwrl!netcomsv!netcomsv!zodiac!szh From: szh@zcon.com (Syed Zaeem Hosain) Subject: Re: getty faster than 9600? Message-ID: <1994Aug13.212838.20506@zcon.com> Sender: szh@zcon.com (Syed Zaeem Hosain) Nntp-Posting-Host: zodiac Reply-To: szh@zcon.com Organization: Z Consulting Group References: Date: Sat, 13 Aug 1994 21:28:38 GMT Lines: 40 In article 7Hw@nntpa.cb.att.com, ft@maxwell.ccs.att.com (Frederick True) writes: >In article <1994Aug9.074434.21408@cs.uno.edu>, >Golden G. Richard III wrote: >>: You don't say what modem you have, but I betcha it's capable of locking >>: the DTE rate (Sun-to-modem) at 19200 or 38400, while talking 14400 or >>: 28800 out the DCE side (modem-to-modem). >> >>I'll have a Sparc 5 shortly, too. Are baud rates higher than 38400 >>supported? 38400 is too low for 28.8K modems. > >Huh? Last time I checked, 38400 > 28800. Whether the SS5's serial driver is >capable of reliably sustaining 38400 I do not know, but that's a different >issue. If the modem is capable of compressing using V.42 (or is it V.42bis? - I can never remember which is error correction and which is data compression ), then text files can in theory be sent with compressions between 2 to 4 fairly easily. Thus, the modem is capable of sending an effective 57600 bps to 115200 bps (give or take a few bits ) between the modems. If you use the built-in serial port max speed of 38400, then this becomes the real throughput (read this word as "bottleneck"). Since these modems can also be used for dial-up services to wherever for remote access, the compression *can* be of value to get blazing fast screen updates, directory listings, etc., etc., etc. The bottom line: to use a V.34 modem at 28800 bps effectively, you should get and use a third-party alternative plug in card that can run at 115200 bps at least. Magma Systems sells their SBUS 2S/1P card for example - there are other vendors too. Z -- ------------------------------------------------------------------------- | Syed Zaeem Hosain P. O. Box 610097 (408) 441-7021 | | Z Consulting Group San Jose, CA 95161 szh@zcon.com | -------------------------------------------------------------------------