From: Brennan_Murphy@NAI.com
Date: Wed Jan 08 2003 - 16:23:29 GMT-3
Hi,
I'm trying to understand the difference between Frame Relay and
ATM when it comes to maximum throughput. Suppose I
currently have a Frame circuit at 256K CIR with burst to 512K.
The Frame vendor claims that you can almost always achieve
the burst throughput....or at least consistently around 450K.
This seems to bear out under ttcp testing.
But if you migrate from Frame to ATM, you aren't necessarily
getting the same throughput, right? I seem to recall ATM follows
a leaky bucket algorithm so that a scr/pcr of 256/512 would
actually give you less total bandwidth. Is this correct and
is there an easy way to determine how to translate from
frame to ATM so that bandwidth is roughly the same.
I do understand that bursting in Frame is not guaranteed
but most vendors do give you an idea of what to expect.
I think I've got a decent understanding of converting Frame
protocol overhead into ATM protocol overhead. It's the burst
piece that is confusing me.
I've looked around for a document on this subject but can't find
one. I'm more used to Frame than ATM... It would be pretty
cool if there were a simple Frame to ATM conversion calculator
out there somewhere.
Anyone have any recommendations?
Thanks!
-BM
.
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