tnixon@hayes.uucp (01/17/91)
In article <2695@maestro.htsa.aha.nl>, beo@maestro.htsa.aha.nl (Jan -BeO the PeO- van Veen) writes: > Just a ignorant question: > If I would hook a V32 modem upto a HST modem, what would > be the Maximum baudrate? They wouldn't connect at all. The HST doesn't have V.32 modulation. If, however, your "V.32" modem is actually an "Automode" modem (meaning that it also has some lower-speed modulations built into it, and can automatically select the highest speed in common with the other modem), then it may connect with the HST at one of the lower speeds -- probably 2400, since most V.32 modems also have V.22bis modulation (which the HST also has). -- Toby Nixon, Principal Engineer | Voice +1-404-449-8791 Telex 151243420 Hayes Microcomputer Products Inc. | Fax +1-404-447-0178 CIS 70271,404 P.O. Box 105203 | UUCP uunet!hayes!tnixon AT&T !tnixon Atlanta, Georgia 30348 USA | Internet hayes!tnixon@uunet.uu.net
lucio@proxima.UUCP (Lucio de Re) (01/22/91)
In article <3732.27958db2@hayes.uucp> tnixon@hayes.uucp writes: >In article <2695@maestro.htsa.aha.nl>, beo@maestro.htsa.aha.nl (Jan >-BeO the PeO- van Veen) writes: > >> Just a ignorant question: >> If I would hook a V32 modem upto a HST modem, what would >> be the Maximum baudrate? > >They wouldn't connect at all. The HST doesn't have V.32 modulation. I beg to differ. The V.32 specification demands the ability to fallback to V.22bis, of which the HST is certainly capable. It will be necessary to program the modems to match, but essentially 2400bps is possible. Lucio de Re. UUCP: ...!uunet!ddsw1!proxima!lucio Internet: lucio%proxima@ddsw1.MCS.COM
lstowell@pyrnova.pyramid.com (Lon Stowell) (01/23/91)
In article <2114@proxima.UUCP> lucio@proxima.UUCP (Lucio de Re) writes: >In article <3732.27958db2@hayes.uucp> tnixon@hayes.uucp writes: >>In article <2695@maestro.htsa.aha.nl>, beo@maestro.htsa.aha.nl (Jan >>-BeO the PeO- van Veen) writes: >> >>> Just a ignorant question: >>> If I would hook a V32 modem upto a HST modem, what would >>> be the Maximum baudrate? >> >>They wouldn't connect at all. The HST doesn't have V.32 modulation. > >I beg to differ. The V.32 specification demands the ability to >fallback to V.22bis, of which the HST is certainly capable. It >will be necessary to program the modems to match, but essentially >2400bps is possible. > Actually, the '84 version of the V.32 recommendation which I am holding in front of me, makes no such statement. Operation of V.32 at 2400 bps is "for further study"....and this would not be V.22bis (Toby can likely comment on the '88 version...) which is a separate recommendation entirely. Many V.32 modems offer V.22 and V.22bis as an option....most of the ones that I have seen allow the V.22 rates to be disabled by configuration... Some V.32 modems don't offer 2400 bps at all--particularly many of the European homologated units--which fully conform to V.32. V.32 doesn't even require 4800 or even 9600.... "any combination of the following data signalling rates may be implemented in the modem: 9600 bit/sec synch 4800 bit/sec synch 2400 bit/sec sync is for further study" (Async mode is ALSO for further study in the '84 version, even though many vendors offered it prior to the '88 version getting to draft stage.....) o
tnixon@hayes.uucp (01/24/91)
In article <2114@proxima.UUCP>, lucio@proxima.UUCP (Lucio de Re) writes: >>They wouldn't connect at all. The HST doesn't have V.32 modulation. > > I beg to differ. The V.32 specification demands the ability to > fallback to V.22bis, of which the HST is certainly capable. It > will be necessary to program the modems to match, but essentially > 2400bps is possible. The currently published version of V.32 (1988) does _not_ include any requirement for fallback to V.22bis. The 1992 version will not, either; however, the 1992 version _will_ include an _optional_ "Automode procedure". This Automode appendix is also part of V.32bis. It explains how modems which have both V.32 and V.22bis can communicate with other multimode, V.32, and V.22bis modems. The original question specifically said "V.32", and didn't ask about Automode modems. The _reality_ is that most current V.32 products on the market also include fallback to V.22bis (and other modulations). But this capability is not mandated by ANY standard. -- Toby Nixon, Principal Engineer | Voice +1-404-449-8791 Telex 151243420 Hayes Microcomputer Products Inc. | Fax +1-404-447-0178 CIS 70271,404 P.O. Box 105203 | UUCP uunet!hayes!tnixon AT&T !tnixon Atlanta, Georgia 30348 USA | Internet hayes!tnixon@uunet.uu.net