home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky comp.os.ms-windows.apps:7549 alt.fax:109 comp.dcom.fax:2512
- Path: sparky!uunet!mcsun!uknet!bhamcs!kam
- From: kam@cs.bham.ac.uk (Keith A Marlow)
- Newsgroups: comp.os.ms-windows.apps,alt.fax,comp.dcom.fax
- Subject: Re: WinFAX Pro 3.0 and Class 1 & 2, what are they?
- Message-ID: <KAM.93Jan26093538@fat-controller.cs.bham.ac.uk>
- Date: 26 Jan 93 09:35:38 GMT
- References: <1993Jan25.175706.6117@honte.uleth.ca>
- Sender: news@cs.bham.ac.uk
- Organization: SoCS, University of Birmingham, UK
- Lines: 47
- In-Reply-To: rempel@hg.uleth.ca's message of 25 Jan 93 17:57:06 GMT
- Nntp-Posting-Host: fattie
-
- >Can somebody explain the difference between Class 1 and Class 2 faxing?
-
- >I want to buy WinFAX Pro 3.0 and would like to know if it's going to
- >work with my Certified Data external fax modem (London Drugs brand name
- >in Canada for those that never heard of it) which I believe is a Class 1
- >fax modem. From what I have heard, class 1 means text only whereas class 2
- >means text and graphics? Is that correct? Does WinFAX Pro 3.0 work with
- >both types?
-
- I think you are getting confused between the Fax compatibility (which
- is almost universally "Group 3" nowadays) and the command interface to
- the Fax-modem being used to send/receive the faxes and data. The
- command interface is used to control how data is passed between the
- computer and modem and where the processing is carried out. The data
- finally appearing on the "telephone line" is (or should be!) identical.
-
- If the Fax-Modem you are considering is termed "Class 1" then it will
- implement features like V42/MNP-2,3,4 error correction and
- V42bis/MNP-5 data compression inside the communication software running
- on your computer - which will most likely be a package that comes
- pre-packed with the the Fax-modem (and which might also make upgrading
- or swapping to other software difficult if you don't like that
- package!). There is an existing "standard" implementation of "Class 1"
- control called RPI (the Rockwell Protocol Interface) but you
- have to hunt hard to find the comms packages that have it! I can only
- think of "Quicklink II Fax".
-
- With a "Class 2" command interface the modem itself runs the software
- to do the processing. Your computer just deals in the "raw" data,
- providing more opportunity to get on with such things as multi-tasking
- other software, etc. (but theoretically making implementation of
- any processing techniques produced in the future more difficult to
- employ with your existing modem).
-
- I think that WinFax Pro 3.0 does offer both control implentations,
- though their demonstration package only features "Class 2". Check on
- the box before you buy!!
-
-
- Hope this helps you,
- --
- _ _ _ _ The University of Birmingham
- ' ) / / / ' ) ) ) / School of Computer Science
- / -' /> o /- /__ / / / __. __ / _ . . . Edgbaston, Birmingham. UK
- / \_(__(_(__/ (_ / ' (_(_/|_/ (_(_,(_)_(_/_/ `
- -=- G7AFQ -=- IO92ck -=-
- K.A.Marlow@cs.bham.ac.uk
-