vgetty and ZyXEL 1496?

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Hi,

On Tue, May 18, 1999 at 03:50:06PM +0200, Wolfram Gloger wrote:
> > some voice gurus out there?  Which is the first ZyXEL ROM version that 
> > supports +VSM=4 (whatever compression format that might be, ADPCM-4 I'd
> > assume)?  My ZyXELs just refuse cooperation :-(
[..]
> U1496EG V 6.13 M  

Hmmm.  I use 6.12 M everywhere (because that's what "worked" at the time
I connected those modems)... looks it time to upgrade.  Thanks for
testing this.

> So at least 6.13 (which is fairly old) has it, I have another one with
> 6.16 which (not surprisingly) gives the same.  (Anyone knows what the
> difference between at+vsm=3 and at+vsm=30 is?)

The "30" setting includes "sync" codes in regular intervals, so that after 
a byte overrun on the serial link the ADPCM coder has a chance to get 
back into sync - otherwise, it will only be noise if even one byte is lost.

> I'll probably have all the 1496's here upgraded to 6.19 soon, so if
> you want to join in, Gert, just tell me and send the EPROMs :-).

I have an Eprom burner myself, but thanks for the offer (I bought the 
burner just to be able to do regular upgrading of my herd of 1496's :) ).

gert
-- 
Gert Doering
Mobile communications ... right now writing from *Berlin* :-)) 
... mobile phone: +49 177 2160221 ... or mail me:  gert@greenie.muc.de