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Cell Relay Retreat>List Archive>month:2001-Jun> msg00027



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AAL question

  • From: "Kostas Kapetanakis" <konstantinos.kapetanakis@bt.com>
  • Date: Wed, 13 Jun 2001 14:28:35 +0100
  • Organization: BT
  • X-Complaints-To: postmaster@axion.bt.co.uk


Hi!

I have one question about AAL. Assume we have the bellow diagram on an ATM
only network.
 Where is the AAL performed? On which device?

End user        NTE        MDF        DSLAM        ATM switch
  ----               --            ----             ----                  --
----
  |    |               |  |            |    |            |     |
|      |
  |    |  -------- |  |--------|    |--------|     |------------- |
|-------->to network
  |    |               |  |            |    |            |     |
|      |
  ----               --            ----             ----                  --
----


<----------------------- UNI 4.0 ------------------->      <----PNNI
1.0 --------->

For me it makes sense that it is performed at the end user so that we have
ATM cells
all over the route form the one end user to the other. However I have been
told that
for practical reasons the AAL functionality is performed on the ATM switch.
Is this
true? If it is so then what kind of connection we have between the end user
and the
switch. Do we still have ATM cells?Isn't it necessary to use AAL before we
transmit
ATM cells?

Thanks in advance!
Regards,
Kostas.