an argument is always running for these services , some says that the deployment is single PVC/VLAN for all services, and control of the services is from the BRAS side, and some says that it will be PVC/VLAN per service , so there is a VLAN for VOIP , VLAN for IPTV and VLAN for Internet.
so which is the best practice , what are pros and cons for each.
