Cell Relay Archive

[Manish Kumar <manish@npi.stpn.soft.net>]

Gopal Kailad wrote:

> Patrick Hurley wrote:
>
> > It is my understanding according to I.610 that F4,F5 performance
> flows
> > are used to identify performance issues at the VPC/VCC level. I
> > downloaded the Word document from ITU.
> >
> > I realize not all manufacturers have implemented all recommendations
> of
> > I.610.  Also, I understand that the recommendations can be
> interpreted
> > differently and certain functions are left out when a switch is
> > manufactured so it can get to market.  I know a particular vendor of
>
> > routers does not have F4,F5 implemented as an example.
> >
> > So what are the flavors of actual functions, with regard to OAM
> F4,F5
> > flows, among real ATM devices (routers/switches) today?
> > --
> > Patrick Hurley
>
>  Strange, I was about to post the same question.According to UNI 3.1,
> only
> Fault Management has to be supported.

This I believe is incorrect as both F4/F5 performance OAM flows can go
right upto CPE (B-ISDN TE) and also be CPE initiated. (So, PM is also to
be supported at UNI).
See 3.5.1 of UNI 3.1.

This is made necessary to meet the requirements for measurement of
certain QoS params.
e.g. Cell error ratio, SECB ratio etc.

For equipment that does not support F4/F5 flow the equipment shoul use a
test VP/VC - but this is a very round about way.

> Are there any ATM Access devices that
> go beyond this and supportthe other functions as per I.610, such as
> performance management,and continuity check ?TIA,

> Gopal