src@scuzzy.in-berlin.de (Heiko Blume) (10/06/90)
c60b-2ax@e260-2f.berkeley.edu writes: >As far as I know, a Dual Standard modem goes for about $999 average price, and >an HST plain could be purchased for something like $600. If you qualify for a >SYSOP discount, you can reduce those by a significant percentage. >A USR Dual Standard will give you 14.4k HST as well as v.32 9600. Both modes >include v.42bis data-compression and v.42 error-correction. just a fact: we now use HSTs with V.42bis for getting (precompressed) news, and have an average throughput of 1644 bps, thats 5.9MB per hour. we love it! a question, while i'm at it: is V.42bis asymmetric like the HST protocol (with a slow backchannel) ?? theres nothing about it in the manual. -- Heiko Blume c/o Diakite blume@scuzzy.in-berlin.de FAX (+49 30) 882 50 65 Kottbusser Damm 28 blume@scuzzy.mbx.sub.org VOICE (+49 30) 691 88 93 D-1000 Berlin 61 blume@netmbx.de TELEX 184174 intro d scuzzy Any ACU,f 38400 6919520 ogin:--ogin: nuucp ssword: nuucp [HST,V.42bis]
jjj@blob.hut.fi (Joni Jaakko J{rvenkyl{) (10/08/90)
In article <1990Oct06.145608.15322@scuzzy.in-berlin.de> src@scuzzy.in-berlin.de (Heiko Blume) writes: >a question, while i'm at it: is V.42bis asymmetric like the HST protocol >(with a slow backchannel) ?? theres nothing about it in the manual. V.42bis has nothing to do with the data transmission technique, it is a data compression standard ONLY. So, you now have the good old HST with the V.42bis which tries to compress the data being sent. What comes to sending precompressed data, the V.42bis has the ability to turn itself off if there's nothing much to compress. 1600-1700 cps throughputs are usual with even a normal HST (read: with MNP5) with compression disabled (&K0) when sending f ex .ZIP files. If you don't believe me, get a HST with MNP5, and then download a precompressed file with the MNP5 compression on. Then put the compression off and try again. You'll be surprised to get better throughput with the compression off. -- jjj@niksula.hut.fi jjj@otax.tky.hut.fi fire me, fire until you die
tnixon@hayes.uucp (Toby Nixon) (10/08/90)
In article <1990Oct06.145608.15322@scuzzy.in-berlin.de>, src@scuzzy.in-berlin.de (Heiko Blume) writes: > just a fact: we now use HSTs with V.42bis for getting (precompressed) news, > and have an average throughput of 1644 bps, thats 5.9MB per hour. we love it! > > a question, while i'm at it: is V.42bis asymmetric like the HST protocol > (with a slow backchannel) ?? theres nothing about it in the manual. V.42bis is a DATA COMPRESSION SCHEME, not a modulation technique. It will work equally well in symmetric or asymmetric modulation applications. It is currently standardized only for use on top of V.42 LAPM error control protocol, and V.42 LAPM is currently standardized only for use in SYMMETRICAL modems that use async-to-sync conversion. It only takes very minor tweeks to LAPM to make it work in an asymmetrical or half-duplex environment, however (slight timer value changes). -- Toby ----------------------------------------------------------------------------- Toby Nixon, Principal Engineer Fax: +1-404-441-1213 AT&T: !tnixon Hayes Microcomputer Products Inc. Voice: +1-404-449-8791 CIS: 70271,404 Norcross, Georgia, USA BBS: +1-404-446-6336 MCI: TNIXON UUCP: ...!uunet!hayes!tnixon Internet: hayes!tnixon@uunet.uu.net
larry@nstar.uucp (Larry Snyder) (10/09/90)
src@scuzzy.in-berlin.de (Heiko Blume) writes: >just a fact: we now use HSTs with V.42bis for getting (precompressed) news, >and have an average throughput of 1644 bps, thats 5.9MB per hour. we love it! Are you using the stock uucico that came with your Unix? Tell us more - as those of us with HST's would like in on the details -- -- Larry Snyder, Northern Star Communications, Notre Dame, IN USA {larry@nstar, uunet!sco!romed!nstar!larry, nstar!larry@ndmath.math.nd.edu} backbone usenet newsfeeds available Public Access Unix Site (219) 289-0282 (5 high speed lines)
RREED@ucf1vm.cc.ucf.edu (10/09/90)
In article <1990Oct06.145608.15322@scuzzy.in-berlin.de>, src@scuzzy.in-berlin.de (Heiko Blume) says: > >a question, while i'm at it: is V.42bis asymmetric like the HST protocol >(with a slow backchannel) ?? theres nothing about it in the manual. >-- V.42bis is not a modulation scheme, its error correction/data compression. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Reginald Reed -- Struggling Computer Science Student -- Does Bo Know Comp Sci?? BITNET=+> rreed@ucf1vm INTERNET=+> rreed@{ucflan,ucf1vm}.cc.ucf.edu