Transwitch Corporation

Cisco Technology, Inc.

Zheng Liu

Ronald P Novick

Jiu An

Zhenping Tan

Terry Xian

Jian Liu

Methods and apparatus for extending the transmission range of a UTOPIA ATM (or packet) interface include providing two UTOPIA extension devices, one for coupling a PHY layer device to a transmission cloud and one for coupling an ATM layer (or LINK layer) device to the transmission cloud. Each device includes a UTOPIA interface emulator, a link controller, and a media transceiver. The media transceiver can be made to support various media such as a backplane, copper cable, optical fiber, or a wireless medium. The UTOPIA extension device preferably includes a UTOPIA inlet buffer, a UTOPIA outlet buffer, an inlet clock decoupling buffer, an outlet clock decoupling buffer, and a flow control module. The UTOPIA inlet and outlet buffers are used for traffic management and the clock decoupling buffers allow the UTOPIA interface emulator and the link controller to operate in different clock domains. The link controller provides error control and backpressure delivery to support flow control.

Methods and apparatus for extending the transmission range of UTOPIA interfaces and UTOPIA packet interfaces

A multiport non-blocking high capacity ATM and packet switch is a single chip switching solution for ATM and packet systems. It is capable of 8&times;8 switching of 800 Mbit/s per port in both directions. The ports support UTOPIA Level 2 interfaces. The switch is non-blocking and lossless, incorporating a backpressure mechanism for eliminating congestion toward any one port. The switch supports prioritized and variable size cell and packet switching.

Multiport non-blocking high capacity ATM and packet switch

A method for scheduling a connection through a node is disclosed. A resource request message is received from a master. An identity of a trunk where the resource request message is to be issued is determined. It is determined whether the node is issuing a predetermined number of resource request messages previously received. The resource request message is issued if the node is issuing less than the predetermined number of resource request messages previously received on the trunk. A busy message is sent to the master if the node has the predetermined number of resource request messages outstanding on the trunk.

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Saratoga, CA, United States of America

Zheng Liu