From: Dan Lockwood (dlockwood@shastalink.k12.ca.us)
Date: Mon Oct 13 2003 - 20:22:21 GMT-3
I have an ATM theory question for all the experts out there. The way
that I always understood ATM was in relation to Frame Relay. DLCIs vs
VPI/VCI, etc. Here is the scenario... I have an OC3 at a hub site, and
four other spoke sites that each have a DS3 and each spoke site is
mapped only to the hub site. When the ATM switch is programmed, is
there a specific bandwidth amount attached to each virtual path? I'm
sure that there can be an arbitrary limit set, but I am thinking again
in terms of FR; I could have many spokes pointing to a hub site and
each spoke would only be limited in terms of bandwidth by what the hub
could sustain. Therefore if all of the spoke sites were very busy
passing information via the hub then there would be less bandwidth
available to each of the spokes. But if one spoke was very busy and the
others were not then there should not be a bandwidth shortage? I am
trying to understand why my SBC rep refuses to install additional DS3s
with virtual paths back to my OC3 unless I upgrade my OC3 to an OC12.
It all seems really silly to me. Can anyone offer some insight?
Thanks!
Dan Lockwood
Microsoft Certified Professional
CompTIA Network+ Certified
Cisco Certified Network Associate
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