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Karl Yeanoplos <kyeanopl@amazon.den.mmc.com> writes -
> I'm thinking about stepping up to a 28.8 modem, probably
> of the Megahertz X-jack variety.
I've been contemplating this myself, yet there's one parameter
concerning the operation of these modems that's proven extremely
difficult to pin down, and that concerns the time it takes for
data to make their way through one of these devices. It's only
milliseconds, but the difference between 150ms and 600ms is
very significant, especially when running an interactive session
on the called system. One is zippy and the other is a slug,
especially with any typing ahead. These numbers are in fact
the actual performance of a Telebit T-3000 vs. the MWave modem
in a TP-755CE.
So - what would really help here is if those who have these
could make some measurements and report them, so a list could
be assembled and comparisons made. I realize this is not an
easy thing to accurately determine without proper test
instruments, however a pretty good informal observation can
be made via the ping utility supplied with most of the TCP/IP
software packages.
First, traceroute to your IP gateway ('hop check' in Winsock).
The first hop shown may or may not be the same place, in any
event note the address of the first hop (often a terminal
server) then ping it and get the round trip time. It may
take 20-30 pings to get a good average, and if it's varying
wildly it'd be best to try again some time when the system
isn't as significantly loaded.
What I've learned so far -
Telebit T-3000 (reference) 150 ms
TDK 14.4 PCMCIA 270 ms
MWave software V1.0 650 ms
MWave software V1.1 600 ms
Of course these are all taken at 14.4, but the basic idea
remains the same.
Thanks!
Billy Y..