From: MADMAN (dave@interprise.com)
Date: Wed Jan 08 2003 - 18:31:35 GMT-3
What service are you paying for???
CBR, if you pay for 512 then you get all 512 all for yourself 24
hours a day
ABR 10% of PCR is gaurenteed
UBR Free for all
This is very generic and I'll look to see if I can find a doc that's
not internal describing the services in better detail!!
Dave
Brennan_Murphy@NAI.com wrote:
> 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
> .
-- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367"You don't make the poor richer by making the rich poorer." --Winston Churchill .
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