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Re: [TCLUG:20467] linux modems
On Thursday, August 17, 2000, tim <tim@tneu.visi.com> wrote:
> On Thu, 17 Aug 2000, John R. Sheets wrote:
>
> > What was that about call waiting? Does that mean the modem will handle
> > call waiting interruptions gracefully? Anything to do with that new
> > V.92 (or whatever it was called) standard that's supposed to land in
> > September?
>
> All modems can handle call waiting gracefully - you just need to adjust
> the S10 register in the modem to a longer timeout (ATS10=X). You'll get a
> couple of bad packets, but your connection will stay up.
>
> AFAIK, the only "call-waiting" enhancement that new modems do is either
> 1. ignore the call waiting tone, or 2. use a different default for S10.
>
> Also, any phone line can disable call waiting for the duration of a phone
> call by adding either a 1170 or *70 to the front of the dial string.
Finally looked it up...
http://www.808hi.com/56k/v92.htm
What V.92 offers:
Increased upstream rates - up to 48k by using a PCM stream through an
a/d conversion. [Still, only 1 a/d conversion is required: if you have
trouble getting 56k rates with V.90, there will be no improvement.]
Faster Handshaking - The time to establish a connection may be reduced.
Call-Waiting Compatibility - Allows modems to stay connected 'on-hold'
while you take an incoming call-waiting call.
...
More Info on Call-Waiting & V.92: The amount of time you can place
your Internet connection on hold while taking another call will be up
to your ISP: the V.92 recommendation will permit ISPs to set their
modems to wait for 0 - 16 minutes, or, to wait indefinitely. V.92
client modems may include software that will warn the user when the
ISP-determined timeout approaches.
Sounds pretty cool for those of us _still_ waiting for DSL. Wonder what
the Linux support will be like, out of the gate.
There's also a SlashDot article I somehow missed:
http://slashdot.org/articles/00/07/04/2034244.shtml
Looks like it won't be out til November (not September as I thought).
John
--
dusk@ravendusk.org http://www.gnome.org
jsheets@codeweavers.com http://www.worldforge.org
http://advogato.org/person/jsheets