Transwitch Corporation

Sing Ngee Yeo

Ronald P Novick

Timothy M Shanley

Methods for accessing full bandwidth in an asynchronous data transfer and source traffic control system include permitting some bus users (e.g. networks cards) to access both odd and even frames while permitting other bus users (e.g. subscriber line cards) to access only odd or even frames. An apparatus according to the invention supports line cards numbering up to 32&#x2212;(2&#xd7;the number of network cards). An exemplary embodiment shows a single network card coupled to an OC-12 network link and twenty asymmetric digital subscriber line cards.

Methods and apparatus for accessing full bandwidth in an asynchronous data transfer and source traffic control system

Methods for implementing a backpressure mechanism in an asynchronous data transfer and source traffic control system include detecting when a bus user is experiencing congestion and preventing other bus users from sending cells over the bus. According to a first embodiment, if congestion is detected for two consecutive frames, the arbiter is inhibited from granting access to any bus user for one frame. According to a second embodiment, if congestion is detected during any frame, all the bus users are prevented from transmitting low priority traffic until congestion is absent for four consecutive frames. An apparatus for performing the methods is also disclosed.

Method and apparatus for implementing a backpressure mechanism in an asynchronous data transfer and source traffic control system

Methods and apparatus for providing redundancy in an asynchronous data transfer and source traffic control system include configuring a primary client and a backup client with the same receive address but different transmit addresses. This allows both clients to receive the same traffic flows by utilizing a common receive address while maintaining independent transmit identity allowing each client to communicate with other clients in the system. The methods of the present invention are compatible with a CellBus&#xae; system operating in either 16-client mode or 32-client mode.

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Stratford, CT, United States of America

Sing Ngee Yeo