🚀 go-pugleaf

On Sat, 18 Dec 1999 19:47:03 +0000, Paul Black <paul@canix.co.uk> wrote:
>> > - What about compression? Demon provide STAC and MS-STAC but the web page
>> >   mentions "V.42bis Data Compression over ISDN using V.120 & X.75", are
>> >   they different terms for a similar thing or does it mean STAC/MS-STAC is
>> >   not supported?
>That's two posts from Bullshit Barry replying to my original query 
>and in both he's failed to answer the question. Why am I not surprised.

I can't find your original question but:

Yes a serially connected external TA should behave just like a modem.
They can usually convert async PPP (from pppd) into sync PPP internally.
V42bis is compression applied to all the data travelling down the line,
STAC is compression applied to the contents of PPP packets.

The only connection that they have is that they both compress data and
the absence of one does not necessarily preclude the usage of the other.

Very few (if any?) ISPs will support V42bis over ISDN.  Many will support
some type of IPCP (ppp) compression.


Faye

-- 
Faye Pearson,
Systems Programmer,
ClaraNET Ltd.       Tel 020 7903 3000

'Tis the dream of each programmer,
Before his life is done,
To write three lines of APL,
And make the damn things run.