The MPLS-OPS Archive

["Andrew Walding" <andy@cellstream.com>]

Hemant,

One small comment (sorry if this is late)...Your statement that the
adaptation layer is 'transparent' to the ATM layer made me stop for a
second.  I'm not so sure it is this black and white.  For instance in AAL-5
ATM switches may be fully aware that a VP/VC is AAL5 and therefore will
perform early and partial packet discard since AAL5 writes the SDU bit in
the PTI field.  It is a nit - I agree, but an important one.

Best Regards,

Andy Walding
CellStream Inc. [ http://www.cellstream.com ]


> -----Original Message-----
> From: Hemant P. Kelkar [mailto:hemant@cyberspace.org]
> Sent: Monday, June 25, 2001 9:19 AM
> To: GAlmaalouf@aol.com; mpls-ops@mplsrc.com
> Subject: Re: general questions
>
>
> Hi,
> In case of ATM an AAL frame the contents and the size vary from one AAL
> type to other. The SAR/CS take care of this and given one AAL layer, it is
> transparent from ATM layer as well.
> regards,
> Hemant
>
> > In the ATM , all cells are of equal sizes (e.g., 53 bytes), but a given
> frame
> > my contains many cells. The question is who decide how many cells a
> given
> > frame will have?. As an example can I say the following:
> >
>
> > Let's assume we are sending 1Mbps from one point to the other through
> the
> ATM
> > network.  Are we saying that 1Mbps/53 bytes is the size of the data
> stream
> at
> > any given ime, or the ATM switch may put several cells and call them
> frame?
> >
> > if this is possibel what is the maximum size of the frame (how many
> cells
> can
> > we put in a frame)?
> >
> > Who determine the sizes of the frame?
>
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