The Differentiated 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 analyzes the DGF ( DTM Guaranteed Forwarding ) service 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.When this service is provided, the aforementioned QoS models are integrated with the transport and switching solution called DTM ( Dynamic Synchronous Transfer Mode ), a fast circuit switching technology. DTM is simple, cost-effective, provides QoS features, and is naturally dynamic in supplying bandwidth as well as flexible in fitting in with other IETF QoS models.Thus in the proposed architecture, IPoDQoS ( IP over DTM QoS ), we make use of the dynamism of network protocols and we offer managed VBR traffic in the IP layer (i.e.: DGF service) not originally offered in DTM technology.
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A QoS service for IP video applications on demand over DTM
Barenco, Cláudia J.; Saloña, Arturo Azcorra; Moreno, José Ignacio
Follow ACM SIGCOMM Computer Communication Review
, Volume 31 (2 supplement)
Association for Computing Machinery – Apr 1, 2001
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