RE: [PWE3] AAL2 Frames, Fischer and Brayley

[Robert.B.Dianda@mail.sprint.com]

Daniel,
    What is the servie that is to be provided?
 
 If all the AAL2 connections that are on one VC are to be transported 
over an MPLS LSP and then mapped back to a single VC then an AAL2 
mapping like the AAL5 mapping is probably not a good idea. AAL2 frames 
are typically smaller than AAL5 frames and can be subcell in size.  
Having MPLS overhead per AAL2 frame would be very inefficient. A 
multicell encapsulation approach (if the delay is tolerable) would be 
much more efficient.
 
On the other hand if the service is to actually switch the individual 
AAL2 connections from one VC to a multiple of other VCs then you are 
talking about AAL2 switching. In which case I think it would still be 
advantagous to transport multiple AAL2 frames in one MPLS frame due to 
the overhead.
i.e. a node could have an AAL2 switching function which would switch the 
AAl2 connections between VCs and then transport the VCs. Or an 
alternative is to map multiple AAL2 frames into an LSP without any ATM 
overhead.
 
Robert Dianda

-----Original Message-----
From: daniel [mailto:daniel@ic4ic.com]
Sent: Thursday, May 23, 2002 3:32 AM
To: pwe3
Cc: matthew.bocci; john.fischer; jbrayley
Subject: [PWE3] AAL2 Frames, Fischer and Brayley



        Hello PWE3ers,

        I am also part of the RAN3 group of 3GPP, which deals with IP 
and ATM transport in UMTS Radio Access Networks (UTRAN).

        UTRANs are probably the most common user of AAL2 and, as you 
know, AAL2 has an SSCS layer very similar to AAL5.

        How about adding this option to the Brayley and Fischer 
proposals?

        The extra fields needed concern the AAL2 user (up to 26 users).

        Regards,

        Daniel Feldman.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Daniel Feldman

System Architecture Team Leader, IC4IC Ltd.

office:   +972(4)959-4644 ext. 121

mobile: +972(55)99-0299

fax:      +972(4)959-4944

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