Daunting atm

[Confused]

I am doing a project of voice over ip. I have read articles on the net but do not understand particular parts.
-Could someone help me if they know how the atm providers ensure that the Peak-to-peak Cell Delay Variation is kept to a particular length.
-How do I contact the other end from my router -Am I given the number of the switch that joins the opposite end _ I have no idea

Any help would be appreciated

[Tiggerz]

Can you be a little more precise with the technology you are talking about. I think most people here will be thinking of programs like ventrillo rather than true voy-op.

I assume you are talking about frame relay and asynch transfer mode..

In which case these links might prove usefull.

http://www.iec.org/online/tutorials/vfoip/

http://www.cis.ohio-state.edu/~jain/refs/ref_voip.htm

[Confused]

Yes You are right.It is concerning async transfer mode and yes I mentioned the wrong delay It is the Cell Transfer Delay.With VOAtm one of the main things is to have a low delay.They said that a path would be set up for traffic with particular parameters and then the time slots(VCI) will be dropped into them.Is the main parameter delay sensitivity. If it is .my guess is then priority cannot be used between all cells in this path.Please set
me on the right track.How does the providers ensure a low delay

[Tiggerz]

From memory I believe the class of service to use is QoS parameter VBR-RT (variable bit rate - real time) with CDV (call delay variation). A higher CDV value means larger buffering for the application.

I think there is a new standard for VBR-RT voice and VBR-RT video (which uses AAL-5).

Call setup is done as per normal atm as you would with an SVC or PVC. I think its the H.323 standard.

The VBR QoS is negotiated with the atm network by the application during call setup. Voice uses a compression layer such as PCM and is then transmitted across the network. You use the VBR Qos to peak and sustainable cell rate as well as the burst size.

My memory is a bit rusty on this sorry, been ages since I have had to do anything in that area.

[Confused]

Thank you for your reply.With your explanation I was able to put the peices together concerning ATM
Thank you again