Cell Relay Archive

[Thomas Frieling <thomas.frieling@arcormail.de>]

Scott Ferguson schrieb:
> 
> Hello-
> 
> In an ATM system with mixed voice (AAL1 or 2) & data (AAL5), how do people
> typically determine which cells are carrying which AAL?

In the endsystem this is configured either manually or by
signalling for every Virtual Connection.

> 
> Do people usually map ranges of VP/VC to carry the different AAL's? For
> example:
> 
>      Lower     Upper   AAL
> ---------------------------
> VC   0x0000 to 0x00ff: AAL2
> VC   0x0100 to 0xffff: AAL5
> 
> (...)

Usually not. Every time when a new connection is established, a
VPI/VCI-couple may be choosen from the pool regardless of the AAL
or other connection parameters. I can't imagine a situation where
the decribed suggestion with ranges would be helpful.
And: for incoming calls the network decides which VPI/VCI is to
be used, only for outgoing calls the endsystem may submit a
preferred value.

Thomas