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Encyclopedia > Flow control
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The flow control mechanism is used for controlling the flow of data in a network under well-defined conditions, while congestion control is used for controlling the flow of data when congestion has actually occurred [1]. Flow control mechanisms are classified by whether or not they have feedback. This article needs to be cleaned up to conform to a higher standard of quality. ...

Contents


Open-loop flow control

The open-loop flow control mechanism is characterized by having no feedback between the receiver and the transmitter. This simple means of control is widely used. The allocation of resources must be a “prior reservation” or “hop-to-hop” type. The Open Loop flow control has inherent problems with maximizing the utilization of the ATM network resources. Resource allocation is made at connection setup using a CAC (Connection Admission Control) and this allocation is made using information that is already “old news” during the lifetime of the connection. Often there is an over-allocation of resources. Open-Loop flow control is used by the CBR, VBR and UBR services (see traffic contract and congestion control) [2]. Jump to: navigation, search CBR may mean: Constant bit rate in telecommunication Captive bead ring Case-based reasoning CBR, a CBC Radio One station in Calgary, Alberta, Canada CBR-FM, a CBC Radio Two station in Calgary Crude birth rate, a term used in demography Cosmic background radiation the IATA... The term variable bit rate (VBR) is a term in telecommunications Quality of Service. ... // UBRacing (UBR) UBRacing is the Formula Student Racing Team of the University of Birmingham, in the West Midlands, UK. The Competition In the 1970s academic institutions in the USA started hosting local student design competitions for off-road vehicles. ... If a service (or application) wishes to use a broadband network (an ATM network in particular) to transport a particular kind of traffic, it must first inform the network about what kind of traffic is to be transported, and the performance requirements of that traffic [1]. The application presents this... This article needs to be cleaned up to conform to a higher standard of quality. ...


Closed-loop flow control

The Closed Loop flow control mechanism is characterized by the ability of the network to report pending network congestion back to the transmitter. This information is then used by the transmitter in various ways to adapt its activity to existing network conditions. Closed Loop flow control is used by ABR (see traffic contract and congestion control) [3]. ABR could refer to: Aberdeen, South Dakota Address Base Register Associativity-Based Routing protocol, a routing protocol used in wireless mesh networks Area Border Router, a type of router used in OSPF routing Athens Lines LLC railroad (AAR reporting mark ABR) Auditory Brainstem Response, an audiometric test [1] Average bit... If a service (or application) wishes to use a broadband network (an ATM network in particular) to transport a particular kind of traffic, it must first inform the network about what kind of traffic is to be transported, and the performance requirements of that traffic [1]. The application presents this... This article needs to be cleaned up to conform to a higher standard of quality. ...


See also

If a service (or application) wishes to use a broadband network (an ATM network in particular) to transport a particular kind of traffic, it must first inform the network about what kind of traffic is to be transported, and the performance requirements of that traffic [1]. The application presents this... This article needs to be cleaned up to conform to a higher standard of quality. ... Jump to: navigation, search Teletraffic engineers use their basic knowledge of statistics, the nature of traffic, their practical models, their measurements and simulations to make predictions and to plan telecommunication networks at minimum total cost. ...

References

  1. ^  Network Testing Solutions, ATM Traffic Management White paper last accessed 15 March 2005.

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