A QoS service for low demand IP video applications over DTM

The differential services model (DiffServ) provides a great flexibility in defining a variety of services through PHBs (Per Hop Behaviors) and traffic conditioners. It fits in well with the integrated services model (IntServ), jointly offering features such as: QoS signaling; admission control; channel management; assignment of resources (buffer and bandwidth); sorter configuration; and establishment of traffic agreements. With this integration you can have a scalable, flexible, and dynamic QoS environment in networks of the Internet core. This article describes and analyses the DGF (DTM Guaranteed Fowarding) services that guarantees a minimum rate of retransmission of packets, based on RSVP signaling and traffic agreements (SLA), as well as losses close to the error rate of the physical medium, which are ideal features for video applications on demand.