Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Polycom Video over ATM-FR network

I have been looking over and reading a number of white papers and solutions. I have yet to really find what I am looking for. Here is the design goal.

We created a new ATM-Frame Relay network consisting of two PVC's to each location. 1-1028K PVC for normal data traffic and a 384K PVC for Video and voice (future, don't really need to worry about this right now) the Idea is that the polycom unit in each facility will use this 384K PVC for all traffic. The issue now stands at this and pardon my lack of knowledge on this.

What is the best method of routing, QOS, Tunneling under this design?



New Member

Re: Polycom Video over ATM-FR network

If you are using Polycom endpoints, their software will allow you to classify the traffic using IP Type of Service. Alternatively, you could use the Cisco MCM as a proxy to identify the video traffic and assign a TOS value to it. Either way, you will need something like the IP-to-ATM QoS mapping features in the Cisco IOS to allow the video traffic to take one PVC and other traffic to use the other. I haven't used these features, but the later releases of IOS code should support this on most platforms with high-speed ATM interfaces.

BTW, you may need to increase your video PVC bit-rate as H.323 384kbps calls use a little over 400kbps due to IP packet overhead.

Hope this helps,


New Member

Re: Polycom Video over ATM-FR network

I agree with John, that would be the way to go and video does take over 400K. Actually, if there is atm/frame conversion, the design guide sates you should allow for 20% overhead so that would be 460K.