Cell Relay Archive

[naveenr <naveenr@future.futsoft.com>]

> Hello everybody,
>
> I have a question regarding QoS requesting at call setup time.
> ATM Forum's UNI specification v3.1 in section 5.1.2.6 states that class A
> service may require strigent cell loss, cell delay, and cell delay
> variation performance. How exactly is this done? (i.e. what field in the
> setup message is used to specify these parameters?). According to the UNI
> specification, the QoS parameter field in the setup message (section
> 5.4.5.19) specifies QoS classes 0,1, ..., 4 and one reserved, but has no
> fields to hold specific performance parameters.
> Am I interpreting this right?

In UNI3.1, i dont think there is  information element for specifying  the 
stingent requirements of the QoS. I think, depending on the QoS class these 
parameters have some service provider defined values.

> Can someone give me a hint how these performance papameters are
> specified?
>
In UNI 4.0, a new information element  "Extended QoS Parameters " has been 
added, this can be used to specify the values for
peak-to-peak cell delay variation and Cell Loss ratio.
for more information refer to ATM Forum's UNI 4.0 Specs

Naveen R (naveenr@future.futsoft.com)
Future Software. Madras .India

> Thanks in advance,
> Pano.
>
> **********************************
> *  Panayiotis Toundas            *
> *  Dept. of Engineering Science  *
> *  Simon Fraser University       *
> *  Burnaby BC, V6A 1S6           *
> *  Canada.                       *
> *  email: toundas@cs.sfu.ca      *
> **********************************
>
>