many thanks...
also who-ever recommended the atm book ....nice one
steve :-)
>From: "Carroll Kong"
>Reply-To: "Carroll Kong"
>To: [EMAIL PROTECTED]
>Subject: Re: ATM Bit rate [7:2256]
>Date: Fri, 27 Apr 2001 12:07:33 -0400
>
>At 10:39 AM 4/27/01 -0400, Stephen Skinner wrote:
> >Guys,
> >i`m looking for a good explanation of what this is...
> >
> >i looked on the archives and cisco site,but beleive i am bieng thick .
> >
> >according to cisco the bit rate comes in various flavours
> >
> >UBR,VBR,CBR....but am i getting this complete leg-before-arm
> >
> >i thought the bit rate was a messunment of how fast the link was ???????
> >
> >i don`t get it ...some-one put me out of my misery....
> >
> >thanks
> >
> >steve :-$
>
>They are the types of "QoS". Service classes defined by the ATM
>standards. (UNI 4.0)
>
>Unspecified Bit Rate (AAL5, pretty much Best Effort)
>Variable Bit Rate (AAL2, for variable bit video, never really took off)
>Constant Bit Rate (AAL1, for constant, guaranteed bandwidth)
>
>There is also ABR (available bit rate), (takes left over bandwidth).
>
>For your information, AAL0 is raw ATM cells, and AAL3/4 is combined
>together. In theory, AAL3/4 is absolutely obsoleted by AAL5 since the cell
>tax would have been higher. (CRCs in EACH cell vs each PDU (9180 octets or
>so)).
>
>Also, VBR has two forms, Non-real time and real time. The actual ATM
>adaption type I listed above may vary, as ATM is very complicated and the
>standards get fuzzed left and right. I hope anyone with more definitive
>knowledge can help you fill in the gaps I may have left.
>
>
>
>
>-Carroll Kong
>FAQ, list archives, and subscription info:
>http://www.groupstudy.com/list/cisco.html
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