Rex Ballard - Director of Electronic Distribution
	http://cnj.digex.net/~rballard

On Mon, 21 Oct 1996, Eric Meyer wrote:

> On 20 Oct 96 at 21:59, Michael Romaner wrote:
> 
> Stay tuned, folks. This is only the beginning. Phase 2 comes when  
> all the backbone providers begin having trouble and begin offering 
> premium services that will guarantee smooth access -- at a premium 
> price.

Worse yet, the ATM backbones cannot distinguish frame-relay traffic and
will therefore be uncertain whether the traffic is high priority or low
priority.  In some cases we are already trying to share bandwidth with
video links across corporate networks, telephone links, and real time
data feeds such as quotes.

Often packets get lost in unusual routes.  It is possible for a message
to get routed through frame relay and end up going through an X.25 link
(incredibly slow).

It is also important to track commitment rates.  If you only have a CIR of
64k, you can't expect T1 performance.  If you pay for full T1 but your ISP
is only paying for 64k, you just moved the bottleneck.  Finally, if the
carrier has 24 fully committed T1 lines connected to a router, the
backbone on the other side had better be DS-3, not T-1.

Finally, we seem to have more pages geared to the corporate and ISDN user.
These pages seem to have substantial numbers of 1024x768x24bit graphics
that can't be shown on any screen.  Most jpegs can be effective at as
little as 150 DPI.  Don't scan a 4x5 picture at 800 DPI and expect
performance for your users.  I don't know too many users with
3200x4000x24 bit displays.  The jpeg viewers have to dither it down to a
sensible resolution anyway.

	Rex Ballard.

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