> > With a true 33.6k connection and no compression the theoretical maximum
> > throughput is 4011 cps (33,600 x 0.11940) and thus close to 70% of an
>
> You very rarely get a 336 connection unless the 2 modems are connecting
> via the same CO or they are on digital lines, like in the case of an
> Ascend MAX with a PRI feeding it.
Hmmm, this is not a very good example, unfortunately, since the MAX uses
standard analog datapumps including the codec, such that this configuration
cant take full advantage of the PRI. You need to drop out the codecs in
order to get the benefits of a digital connection, like e.g. in the new PM-3
product by Livingston, the USR Total Control, Primary Access product line
from 3Com, MICABlazer from Telebit or the future 56k based Rockwell products
(which are expected to be used in MAXes starting next year).
> > async 57200 bps connection. But as Eric pointed out, latency is larger
> > for modems, and subjectively the difference may be greater.
>
> Also, the modems will retrain and adjust their speed down if they notice
> lots of errors at the higher speed. You may connect at 33600 but 1/2 hour
> later you are really at 21.6.
Any decent modem can train up as well as down and may well adjust the
speed up again after temporary line impairments. Check your speeed with ATI6
on USR products, for example, or AT*O and ATSQ on Digicom Scout products
or buy a product with an LCD screen in front so that you can see the
currently used line speed right on thr front panel.
> ~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~
>
> (Don't steal my squigglies)
I stole em..
Wolfgang
Wolfgang Henke wolfgang@whnet.com . http://www.whnet.com
WH Networks ..... ftp://ftp.whnet.com
2672 Bayshore Parkway, Suite 503 ............ fax (415) 390 9317
Mountain View, CA 94043 ...................... (415) 390 9316