lron@easy.hiam (Dwight Hubbard) (01/15/91)
In article <1991Jan15.021116.23778@athena.mit.edu>, Richard L. Carreiro writes: > > Ok, a few questions.... > A) what are V.32, V.32bis, V.42, and V.42bis V.32 Full duplex, 9600bps, Ansynchrouns/synchrouns (9600 both send and receive at the same time, with or without start and stop bits) V.32bis same as V.32 except runs at 14.4Kbps. V.42 Error detection/correction protocol, includes MNP levels 1-4. V.42bis Compression, currently sits on top of V.42 protocol. Unlike MNP-5 compression V.42bis does not slow down throughput on compressed files. > B) which of these does Telebit support? Telebit makes several different models of modems, All the new telebit modems have V.42/V.42bis/MNP-5 (I think, I could be wrong), Only their V.32 modem and the T2500 have V.32. Telebit does not make a V.32bis modem yet since V.32bis has not been through it's final approval yet and could change. > C) which of these does USR support? USR also makes several different models of modems, All the new USR modems support V.42/V.42bis/MNP1-5, Only their V.42 modem and the Dual Standard support V.32, the newer Dual Standard models support V.32bis (as the standard stands at this point, compatibility if the standard changes is another story) > D) does Telebit support any MNP stuff? Does USR? Both up to MNP-5, very few modem manufactures make modems that support MNP levels above 5. Also, note that MNP1-4 are a subset of V.42. > Much thanks, as a Telebit or USR purchase is in my > immediate future, and I'm trying to decide which to get... Take a look at some of the newer V.32 modems, the mail order prices on some of them are as low as $450 which is less than the famous USR sysop price for the HST 14.4. CDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDBDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD? 3 Dwight Hubbard 3 USENET : uunet!easy!lron 3 3 Kaneohe, Hawaii 3 GT-Power: 029/004 (lron) 3 3 3 CFR : 31:910/101 (Dwight Hubbard) 3 @DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDADDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDY
andrew@postmod.UUCP (Andrew J Richardson) (01/16/91)
In article <1991Jan15.021116.23778@athena.mit.edu>, Richard L. Carreiro writes:
-> Ok, a few questions....
-> A) what are V.32, V.32bis, V.42, and V.42bis
v.32: telecommunications protocol to run data transfer at 9600 bps.
v.32bis: protocol to run at 14400 bps (contrary to some claims, has NOT been
finalized. no guarantee that modems produced today will be FULLY
compliant with the standard when finalized).
v.42: error control protocol, packetized, includes lap-m with mnp 1,2,3,4
as a fall-back
v.42bis: data compression algorithm protocol, includes mnp 5 as a fallback.
-> B) which of these does Telebit support?
the telebit t1600 supports v.32, and i _think_ both v.42's
the telebit t2500 supports all four plus pep, a proprietary protocol for
data transfer of up to 19200 bps, using a lempel-ziv compression algorithm.
-> C) which of these does USR support?
don't know, don't own one.
-> D) does Telebit support any MNP stuff? Does USR?
as above, the t2500 includes v.42 and v.42bis, which themselves use mnp 1-5
as fallbacks. this ensures compatability with the large group of mnp
capable modems already in use. other telebit modems may include mnp, such
as the traiblazer+, which includes mnp 1,2,3,4.
-> Much thanks, as a Telebit or USR purchase is in my
-> immediate future, and I'm trying to decide which to get...
good luck!
---andrew
andrew@postmod.uucp
uunet!postmod!andrewhorke@rhoen.in-berlin.de (Bernhard Kroenung) (01/17/91)
rlcarr@athena.mit.edu (Richard L. Carreiro) writes: >A) what are V.32, V.32bis, V.42, and V.42bis V.32 : 9600 bps V.32bis : 14.400 bps V.42 : data security (equals MNP1-4) V.42bis : data compression (equals MNP5-9) PEP : multi-carrier (up to 18.400 bps) HST : 14.400/450 Baud (cheap solution) >B) which of these does Telebit support? T2500 : V.32, V.42, V.42bis up to 19.200 Baud plus PEP >C) which of these does USR support? HST ds : V.32, V.32bis, V.42, V.42bis up to 38.400 Baud plus HST >D) does Telebit support any MNP stuff? Does USR? Telebit and USR support MNP1-5 >Much thanks, as a Telebit or USR purchase is in my >immediate future, and I'm trying to decide which to get... I made my mine : +49 6656 7874 HST ds +49 6656 7914 T2500 :-) Ciao Bernhard -- Bernhard Kroenung, Bahnhofstr. 8, D-W6408 Ebersburg/Rhoen, Germany +49 6656 386 horke@rhoen.in-berlin.de sysop@fulmin.zer.sub.org Kronung@DGIHRZ01.BITNET
sysop@insider.zer.sub.org (01/18/91)
> A) what are V.32, V.32bis, V.42, and V.42bis V.32 - 9600 Bd full duplex V32bis - 14400 Bd full duplex V42/V42bis - data kompression (like MNP, partly including MNP) > B) which of these does Telebit support? T2500 has V32, at least V42, maybe 42bis, but I'm not sure... > C) which of these does USR support? All. > D) does Telebit support any MNP stuff? Does USR? Sure, see above... > Much thanks, as a Telebit or USR purchase is in my In the moment, I think the decission between a Telebit or USR Modem will probably not bee too hard (IMHO). - Telebit is rather high priced compared with the HST/V32/HST DS modems (especially when using the USR SysOp Support Program, which reduces a DS's price to somewhere below $700) - though Telebit support protocol spoofing (local ACK of data packages when using slow protocols like UUCP-F/G, Kermit or XModem) and result in pretty good CPS rates, USR with its V32bis has pulled equal. - when calling systems that do not run Unix, USR is clearly the market leader (I once heard that USR had a market share of over 80% of the High Speed Modems) - no matter which one you select, it should have V32, as this is the only way to connect with other companies' high speed modems above 2400 Bd Amiga - What else ? | Garry Glendown The Insider HST/V32 0662177923 // | UUCP: cbmvax!cbmger!inside!garry Fido: 2:243/43.999 // | garry@fulmin.rhoen.sub.org Garry@DGIHRZ01.BITNET \X/ | Zerberus: SYSOP@INSIDER.ZER --- SysOp @ INSIDER -- Cn nybdy rd ths ? Thn cll m fst !
mcr@Sandelman.OCUnix.On.Ca (Michael Richardson) (01/19/91)
In article <188630d2.ARN0a34@easy.hiam> lron@easy.hiam writes: >Telebit makes several different models of modems, All the new telebit modems >have V.42/V.42bis/MNP-5 (I think, I could be wrong), Only their V.32 modem >and the T2500 have V.32. Telebit does not make a V.32bis modem yet since >V.32bis has not been through it's final approval yet and could change. > >> C) which of these does USR support? > >USR also makes several different models of modems, All the new USR modems >support V.42/V.42bis/MNP1-5, Only their V.42 modem and the Dual Standard >support V.32, the newer Dual Standard models support V.32bis (as the standard >stands at this point, compatibility if the standard changes is >another story) I think it should be pointed out that just because two modems support V.42 doesn't mean they can talk to each other at high speed. V.42/V.42bis/MNP-5 are like ASCII (vs EBDIC - damn, I can't even remember how to spell that IBM mainframe encoding standard. Which letter am I missing??) V.32 is a CARRIER standard. One can run V.42bis over 300 baud carriers if you so desire (unless the standard specifically outlaws that) -- :!mcr!: | The postmaster never | - Pay attention only Michael Richardson | resolves twice. | to _MY_ opinions. - HOME: mcr@sandelman.ocunix.on.ca + Small Ottawa nodes contact me Bell: (613) 237-5629 + about joining ocunix.on.ca!
SteveX@omx.UUCP (Steve Tibbett) (01/22/91)
In article <1886cb88.ARN07ec@postmod.UUCP> andrew@postmod.UUCP (Andrew J Richardson) writes: >In article <1991Jan15.021116.23778@athena.mit.edu>, Richard L. Carreiro writes: >v.32bis: protocol to run at 14400 bps (contrary to some claims, has NOT been > finalized. no guarantee that modems produced today will be FULLY > compliant with the standard when finalized). v.32bis was recently finalized. >-> C) which of these does USR support? USRobotics has plenty o modems - Their NEW dual standard does all of them, I believe (V.32, V.32bis, V.42bis), but uprading to it is something like $575 from the dual standard! Their HST doesn't support any of them, rather uses it's own protocol. There is also the Hayes Ultra modem, which has a pretty good Sysop price, and does V.32, V.42, V.32bis in the new one (which ain't out yet, but they say it's a "cheap/easy" uprade)... -- ...Steve Tibbett...bix=s.tibbett...Plink=STEVEX...BBS=613-731-3419... ...VirusX=4.01...Insert Disclaimer Here...
chucks@pnet51.orb.mn.org (Erik Funkenbusch) (01/29/91)
SteveX@omx.UUCP (Steve Tibbett) writes: >In article <1886cb88.ARN07ec@postmod.UUCP> andrew@postmod.UUCP (Andrew J Richardson) writes: >>In article <1991Jan15.021116.23778@athena.mit.edu>, Richard L. Carreiro writes: >>v.32bis: protocol to run at 14400 bps (contrary to some claims, has NOT been >> finalized. no guarantee that modems produced today will be FULLY >> compliant with the standard when finalized). > >v.32bis was recently finalized. > >>-> C) which of these does USR support? > >USRobotics has plenty o modems - Their NEW dual standard does all of them, >I believe (V.32, V.32bis, V.42bis), but uprading to it is something >like $575 from the dual standard! > >Their HST doesn't support any of them, rather uses it's own protocol. > >There is also the Hayes Ultra modem, which has a pretty good Sysop price, >and does V.32, V.42, V.32bis in the new one (which ain't out yet, but they >say it's a "cheap/easy" uprade)... > >-- > ...Steve Tibbett...bix=s.tibbett...Plink=STEVEX...BBS=613-731-3419... > ...VirusX=4.01...Insert Disclaimer Here... Actually their HST's DO support V.42 and V.42bis. UUCP: {amdahl!bungia, crash}!orbit!pnet51!chucks ARPA: crash!orbit!pnet51!chucks@nosc.mil INET: chucks@pnet51.orb.mn.org
ghost@bucsf.bu.edu (Jay Adelson) (01/30/91)
Now here's a question for you: Let's say you're going to be dialing your College's computer UUCP site. The dialup modems are telebit t2500's, but the output to the terminals on campus are 9600 max anyway, so really dialing up wouldn't go faster. Which modem would then be better: The Telebit, or the US Robitics? I'm assuming the v.32 is what you would use on dialup anyway...unless I'm mistaken, so could EITHER really be BETTER? The reason I ask is I've heard the Telebit is supposed to be better for uucp connects.\ -Jayzer -- """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" [ Jay Adelson | BIX: j.adelson ] [ T.G.C. ] [ ghost@bucsf.bu.edu | Channel One: ] [ 1039 Commonwealth Ave. #18 ] [ GEnie: J.ADELSON1 | Jay Adelson ] [ Boston, MA. 02215-1008 ]
daveb@cbmvax.commodore.com (Dave Berezowski) (01/31/91)
In article <GHOST.91Jan29161908@bucsf.bu.edu> ghost@bucsf.bu.edu (Jay Adelson) writes: > >Now here's a question for you: > > Let's say you're going to be dialing your College's computer UUCP site. > > The dialup modems are telebit t2500's, but the output to the terminals >on campus are 9600 max anyway, so really dialing up wouldn't go faster. > >Which modem would then be better: The Telebit, or the US Robitics? > >I'm assuming the v.32 is what you would use on dialup anyway...unless >I'm mistaken, so could EITHER really be BETTER? > >The reason I ask is I've heard the Telebit is supposed to be >better for uucp connects.\ > It all depends on the way the T2500 is configured. If it is configured properly then it should allow you to dial in with a V.32 modem with V.42 error detection/correction and V.42bis data compression which the new US Robotics Courier Dual Standard will do. Here are some excerpts from my T2500 configuration notes: ATX2S51=254S110=0S111=0S95=2S96=1S66=2S58=2S93=20S92=1 X2 - turn on result codes S51=254 - auto speed select on (autobaud) S110=0 - PEP spoofing off (may want to leave on for other PEP dial-in users) S111=0 - ditto S95=2 - auto reliable mode on (MNP Class 4 error correction) S96=1 - data compression on S66=2 - lock-in at 19,200 S58=2 - RTS/CTS flow control (optional) S93=20 - wait up to 2.0 seconds for V.32 link up (IMPORTANT!) S92=1 - issue PEP answer tones at end (so that V.42 can connect first) S7=90 - wait max. of 90 seconds for carrier detect Page 557 of the T2500 manual references the need to increase S93 when attempting to talk to a V.32 modem. Setting 'S92=1' is also very important; it gives V.32 modems a chance to negotiate a link up first. If the T2500 is NOT configured properly, you MAY NOT be able to connect at 9600 baud with a V.32 modem. In this case, you'll probably want to use another Telebit modem (with PEP) to dial up the system. I have successfully connected to a T2500 at 9600 baud with a UDS FasTalk modem which supports V.32/V.42/V.42bis. The trick was to increase the FasTalk's S7 register to 90 which tells it to wait a max. of 90 seconds for carrier detect (V.32 link up can take some time). Good luck. daveb -- David Berezowski {caip,ihnp4,allegra,seismo}!cbmvax!daveb