Browse Prior Art Database

ATM Traffic Shaper

IP.com Disclosure Number: IPCOM000125481D
Original Publication Date: 2005-Jul-10
Included in the Prior Art Database: 2005-Jul-10
Document File: 2 page(s) / 86K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

A Traffic Shaper in broadband access bridges/routers is an implemented data structure that must continuously pick the most suitable packets for transmission. It should be simple, small, and efficient such that it can be implemented on small microprocessor based systems, and handle transmission speeds of at least 2,3 Mbps. This idea describes an integrated traffic shaper for an ATM (Asynchronous Transfer Mode) interface on a broadband access bridge/router. This traffic shaper must be able to control the transmission of packets on the ATM interface according to multiple sets of criteria, including: - Allow for prioritization of multiple virtual circuits (PVCs - Permanent Virtual Circuit) relative to each other. For example, having a high priority PVC carrying voice traffic which should supersede normal data traffic. It must also be allowed for equal priority among multiple PVCs to share available bandwidth.

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ATM Traffic Shaper

Idea: Mark Allan Gladden, US-Dallas

A Traffic Shaper in broadband access bridges/routers is an implemented data structure that must continuously pick the most suitable packets for transmission. It should be simple, small, and efficient such that it can be implemented on small microprocessor based systems, and handle transmission speeds of at least 2,3 Mbps.

This idea describes an integrated traffic shaper for an ATM (Asynchronous Transfer Mode) interface on a broadband access bridge/router. This traffic shaper must be able to control the transmission of packets on the ATM interface according to multiple sets of criteria, including:

- Allow for prioritization of multiple virtual circuits (PVCs - Permanent Virtual Circuit) relative to each other. For example, having a high priority PVC carrying voice traffic which should supersede normal data traffic. It must also be allowed for equal priority among multiple PVCs to share available bandwidth.

- Allow for prioritization of different types of traffic running on the same PVC according to QOS (Quality of Service) policies (prioritize VOIP traffic over normal data transfers on the same PVC).

- Perform segmentation of packets into 53 byte cells for transmission through the ATM network

- Perform ATM traffic shaping for each non-UBR (Unspecified Bit Rate) PVC according to traffic rate parameters (SCR, PCR, MBS)

Fig. 1 depicts contention for the WAN interface transmitter among multiple sources of voice and data traffic.

The Traffic Shaper allows multiple VCs to be prioritized relative to each other. If two or more VCs have the same priority, a round robin method will be used to allow equal access to the transmitter. The default priority for data VCs is lower than the default for a dedicated voice VC. Fig. 2 depicts VCs at three different priority levels within a system. This could be an IAD with a highest priority voice VC, three data VCs of equal priority, and one low priority VC.

The system also allows IP b...