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Re: SAR & AAL2 ----WHY NOT?????

  • From: Baris Aksoy <baris.aksoy@gte.net>
  • Date: Sat, 15 Jan 2000 08:38:40 GMT
  • Distribution: world
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Hello,

Either I'm missing something here or, you miss that AAL2 layer also has SAR layer. AAL2 consists of a Common Part Sublayer (CPS) and a Service Specific Convergence Sublayer (SSCS):

     -The AAL2 CPS specification, ITU-T I.362.2 - 09.97

    - The AAL2 SSCS consists of two elements:
         Segmentation and Reassembly (I.366.1) - 06.98
         I.Trunk (I.366.2) - 02.99

The SAR-SSCS sublayer for the AAL2 supports a bandwidth-efficient transmission of low-rate, short, and variable length packets in delay sensitive applications, such as voice.In this way, it's different form AAL5- SAR function, which targets transmission of bulk of variable length non-real time packets.

Baris
 

Jeff Wilson wrote:

Can someone kindly explain why AAL2 gets by without SAR functionality?
Is there any reason why AAL2 has a completely different structure than
other adaptation layers?

I have already gone through I.363.2, without much insight.

A copy of the response to my email address will be appreciated.

Regards,
Jeff
jwilson@sta.samsung.com