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- From: naddy@mips.ruessel.sub.org (Christian Weisgerber)
- Newsgroups: comp.dcom.modems
- Message-ID: <H.eg.sQw142IsvWs@mips.ruessel.sub.org>
- Organization: My Individual Private Site
- Subject: Re: Bad Experience Seeking 2400 bps, v.42bis
- References: <9301140239.AA17511@cs.utexas.edu>
- Reply-To: naddy@mips.ruessel.sub.org
- X-Software: HERMES GUS 1.10 Rev. Dec 18 1992
- Date: Sat, 23 Jan 1993 00:59:04 CET
- MIME-Version: 1.0
- Content-Type: text/plain; charset=US-ASCII
- Content-Transfer-Encoding: 7bit
- Lines: 85
-
- In <9301140239.AA17511@cs.utexas.edu>, NBECC::KENNEY writes:
-
- [... long explanation deleted...]
-
- Yes, I can understand the argument that "it makes sense to reallocate
- the error correction and data compression tasks to the host computer".
- (Actually, in a discussion in comp.dcom.isdn some people suggested to
- take the compression out of the transmission layer altogether.)
-
- However, my main concern regarding Rockwell's specific product was
- from the user's point of view:
-
- When a user buys a modem labeled "MNP/V.42/V.42bis" today he assumes a
- traditional design. I think the RPI approach would be considered
- inferior and modem vendors seem to share this opinion. You won't
- anywhere see a RPI modem advertised as needing additional driver
- software, at most this fact is mentioned in the small print.
-
- Also, not all the world is a DOS machine. Not all the world even is a
- PC. There are different hardware platforms and especially in the PC
- market lots of different operating systems. Rockwell cannot provide RPI
- support for all of these.
- Does Rockwell provide a portable (say C code) MNP/LAPM/V.42bis RPI
- driver template that could rather easily be ported to different
- environments? If so, this would ameliorate the situation. However, my
- current state of information and impression is that there is only RPI
- driver support for MS-DOS and both driver code and RPI specifications
- are proprietary.
-
- > The Rockwell RPI, in conjunction with Rockwell modem hardware, provides a fully
- > synchronous V.42bis LAPM data stream to the other modem - there is no inherent
-
- I assume RPI simply provides a protocol that allows the DCE to handle
- asynchronous<->synchronous (HDLC) conversion, similar in concept to
- Hayes' AutoSync. Correct?
-
- > In fact, it is probably preferable for the '486 to
- > do your data compression than an 4 MHz 8 bit microcontroller.
-
- Actually these "4MHz 8 bit microcontrollers" are doing quite well in
- current 2400/V.42bis modem implementations at negligible extra cost
- compared to a 2400/none modem.
-
- > The result of the RPI based V.42bis/MNP5 is only to provide the lowest cost
- > solution for a full V.42bis/MNP5 featuresd modem. The idea is to provide a cost
- > benefit to the end user - it is not a scam, it is the 'real thing'.
-
- Excuse me, but the idea behind offering a product is to _succeed_in_the_
- _market_. Obviously a singel-chip modem core is very attractive to modem
- manufacturers. This may result in end products with an increased
- performance/cost ratio, and finally it _may_ benefit to the end user.
- However, this is the consequence not the initiative.
-
- > BTW, The ZOOM modems I have seen indicate the V.42bis/MNP5 is "RPI Based" -
- > perhaps the person selling it to you should have made that clear.
-
- This did not happen to me; I don't remember who reported this. But it
- clearly demonstrates my point: These modems are sold as fully capable of
- MNP/LAPM/V.42bis. The average modem buyer certainly has an idea what to
- expect from MNP etc. On the other hand "RPI-based" is widely unknown and
- very counterintuitive to most user's expectations. This is why I will
- continue to spread information about RPI as a WARNING!
-
- I already received requests by concerned users how to use the RPI driver
- with their favorite non-RPI-sensitive DOS (!) comms application. These
- people were tricked into thinking they'd buy a full MNP/V.42bis modem
- only to find out that they can't use this important feature in their
- environment. Pardon the language but on behalf of those users I'm
- _pissed_off_.
-
- Rockwell could have forseen the result of their RPI chipset. However, I
- doubt that licensing RPI technology explicitely forces a modem vendor to
- plainly state that the resulting product is only able to deliver its
- claimed performance with the supplied software driver. If Rockwell care
- as much about end user satisfaction as implied by their Product Manager
- they should consider insisting on such an agreement.
-
- > Tony Zuccarino
- > Product Manager
- > Rockwell International
-
- BTW, please see my signature for the correct spelling of my name.
-
- --
- Christian "naddy" Weisgerber, Germany naddy@mips.ruessel.sub.org
-