The network includes a number of network elements coupled together to form segments of the ring network. In particular, an illustrative embodiment of the present invention includes a method for controlling virtual connections between endpoints over a unidirectional ring network. A method for controlling access to a broadband ring network is described which determines whether a virtual connection will be allowed based on the impact that the connection will have on each affected segment of the ring network. The above mentioned problems with broadband ring networks and other problems are addressed by the present invention and which will be understood by reading and studying the following specification. Without adequate control of new connections, a system could experience significant problems with quality of services provided over the networks high demand periods.įor the reasons stated above, and for other reasons stated below which will become apparent to those skilled in the art upon reading and understanding the present specification, there is a need in the art for controlling the generation of virtual connections, e.g., ATM connections, in a ring network.
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However, the standards do not provide for determining how to control the generation of connections in the ring network. These standards allow for the transmission of data between endpoints in a ring network over virtual circuits. These Bellcore standards are incorporated herein by reference. For example, Bellcore has provided standards for transmitting asynchronous transfer mode (ATM) packets over a SONET ring network. The telecommunications industry has been developing approaches that will allow better use of bandwidth in a broadband network.
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However, as anyone who has attempted to download a large data file over the internet can attest, current broadband services do not operate well over the existing telecommunications infrastructure. By the middle 1980's, the SONET standard was well established as a time division multiplexing technology for fiber optic transport systems. Unfortunately, the existing telecommunications networks are not designed to provide quality broadband services.Īs the demand for access to telecommunications services increased, the industry used time division multiplexing technology to aggregate a number of lower bandwidth circuits onto higher bandwidth circuits.
These “broadband” services are increasingly in demand. In recent years, additional telecommunications services have been developed that can use much higher bandwidth, e.g., internet access, video conferencing, corporate intranets. These narrowband circuits provided acceptable performance when the bulk of the demand for telecommunications services was predominantly for voice traffic. The telecommunications industry traditionally has provided services to subscribers over narrowband circuits. The present invention relates generally to the field of communications and, in particular, to a circuit and method for controlling virtual circuit connections in a ring network.
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