Cell Relay Archive

[ronaldd@ihgp3.ih.lucent.com (-Davis,R.H.)]

In article <ays-1411971212550001@korea-161.ppp.hooked.net>,
Alan Y. Schaevitz <ays@hooked.net> wrote:
>In article <346BF5AB.C0A1635D@End.Of.Message>, Milan
><Email@End.Of.Message> wrote:
>
>">"Anyone knows where can I find information for AAL2? Do ITU-T I.363 have
>">"a description on this? Thanks.
>">"
>Yes, ITU-T I.363.2 defines the standards for AAL2.  Specifications from
>

a second document at which you might want to look is i.366.1
which defines the service specific sar's for aal2.

in a nutshell, aal2 is basically like aal 3/4 with the exception
that data from multiple cid's (the aal 2 equivalent to the mid of
aal 3/4) may be multiplexed into a single atm cell.  by
contrast, an atm cell may only contain data from a single
mid in aal 3/4 with cell interleaving of traffic from multiple
mid's into a single atm layer cell stream.

oh yeah, another difference is that aal 2 provides multiple
sscs's so that you can "simplify" the protocol by bypassing
error detection or assured data transfer if you wish to do
so.  aal 3/4 also has an optional assured data transfer mode
(although i.363 does not explicitly define the procedure
to be used).

-- 
  __  ______  __  / __/ |       lucent technologies, naperville il, usa
_/ (_(_) / (_(_/_/_(_/  .       ronald.h.davis@lucent.com
"in every loss is the opportunity for future gain."