-=> Quoting Craig Ford to Richard Town <=-

 RT> perhaps you'd like to explain where in
 RT> either V42 or V42bis does it permit V42bis to be switched off when
 RT> under V42 fallback negotiation action?
 CF> A question which demonstrates that you have no earthly idea of what it
 CF> is that you are attempting to imply.

Thanks for having the guts to at least attempt a reply

 CF> 1. Data compression _requires_ error control, it cannot and _will_ not
 CF> be  attempted if there is none. Error control is negotiated and
 CF> established _before_ data compression negotiation is even attempted.

Er, so?

 CF> 2. An alternate error control procedure to LAP-M is defined in V.42,
 CF> and procedures for yet others are provided for. The only procedures
 CF> explictly defined are LAP-M, and the equivalents of MNP service levels
     ^^^^^^^^^^^^^^^^^                                   ^^^^^^^^^^^^^^^^^^
 CF> 2-4.
     ^^^
Agree so far...

 CF> 3. V.42bis _can_ be negotiated over forms of error contral other than
 CF> LAP-M, but is _not_ done so under the auspicies of an ITU-T
 CF> recommendation.

Erm, but that doesn't answer the question.  Where in ITU-T spec does it
state that data compression may _not_ be available when MNP service level
2-4 fallback is negotiated?  In other words, given that V42bis _is_
available in USRs with LAP-M (as per V42 spec), why is it _not_ available
with MNP fallback (as per V42 spec)

 CF> 4. Microcom has made freely avaialble the method by which V.42bis can
 CF> be  negotiated over MNP, but the method is _not_ part of any ITU-T
 CF> recommendation.

This has got nothing to do with V42, hence is just a smokescreen

 RT> That's why they don't fully support CCITT agreed recommendations 
 RT> Advertising product as "fully compliant" in this regard is false 
 CF> Bull.

How can MNP levels 2 or 3 can be independently selected on a USR?

However, you dress it up, internationally agreed recommendations or no,
the fact still remains that (apart from WorldPort?)  USR's can't do
V42bis with MNP error correction.  As compared with competing modems,
they're deficient.  As compared with less expensive modems they're
deficient.  As a firm believer in the market, I do hope you can
at least find this common ground

PS  Is it the WorldPort that does MNP10?

PPS And when is there going to be an international Courier?  A point off
this system has just come back from trying to install a Courier on a
marine INMARSAT mobile.  Can't configure initial HST-CELLULAR line level,
can't cause variations of line level according to recieved signal variations,
and has no method of varying various BUSY detects, etc if using shoreside
lines.  Had it not been for client's insistance...

rgdZ
Richard

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