Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2005-02-01
2005-02-01
Ho, Duc (Department: 2665)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S413000, C370S469000, C370S474000
Reexamination Certificate
active
06850526
ABSTRACT:
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.
REFERENCES:
patent: 6256308 (2001-07-01), Carlsson
patent: 6452927 (2002-09-01), Rich
patent: 6693911 (2004-02-01), Yamanaka
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patent: PCTUS99/23559 (1999-10-01), None
UTOPIA Specification Level 1, Version 2.01, af-phy-0017.000, The ATM Forum Technical Committee, Mar. 21, 1994.
UTOPIA Level 2, Version 1.0, af-phy-0039.000, The ATM Forum Technical Committee, Jun. 1995.
UTOPIA 3 Physical Layer Interface, af-phy-0136.000, The ATM Forum Technical Committee, Nov. 1999.
Liu Jian
Liu Zheng
Novick Ronald P.
Tan Zhenping
Gordon & Jacobson P.C.
Ho Duc
TranSwitch Corporation
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