Ciena Corporation

Catena Networks, Inc.

Mark Feeley

Andrew Deczky

Andreas Weirich

Jonathan Boocock

Michael Alain Gazier

Gudmundur &ldquo;Jim&rdquo; Hjartarson

Ken Neudorf

Mike Magnusson

Reza Etemadi

Gudmundur Jim Hjartarson

Apparatus implements combined packetized time-division multiplexed (TDM) streams and TDM cross connect functions. The apparatus includes an input buffer, a reassembly state machine, a frame buffer, and a segmentation state machine. The frame buffer includes multiple bins for storing cell data. The segmentation state machine retrieves information from the bins as associated with each DS0 and assembles output cells for transmitting output DS0s. The cells may be in asynchronous transfer mode (ATM) format, allowing a single ATM backplane to be used for voice signals, data signals, and combined voice/data signals. Various types of ATM cell formats are supported.

System and method for implementing combined packetized TDM streams and TDM cross connect functions

A voice and data communication system whereby a line card digitizes and packetizes voice communications signals upon the failure of Customer Premises Equipment (CPE). The system comprises a line card for coupling the CPE with a network. Furthermore, the invention provides a system that can direct the voice signals to either or both of a voice network and a data network.

Enhanced line card and packetizing CPE for lifeline packet voice telephone

An integrated line card for providing an analog termination for both POTS and xDSL signals that present the appropriate impedances at xDSL frequencies for the xDSL signals and appropriate impedances at POTS frequencies for POTS signals. The line card comprises a front end for coupling combined POTS and xDSL transceiver circuits to a telephone line at a single termination and an impedance generator responsive to the frequency range of the POTS and the xDSL circuits for generating the appropriate impedances on the line at xDSL frequencies for xDSL signals and the appropriate impedances at POTS frequencies for POTS signals, such that the signals are coupled to the card without the use of a splitter. Preferably, the xDSL circuits and the POTS circuits share a common driver for driving signals onto the loop. An advantage of this arrangement is that the two circuits may be designed together thus ensuring out-of-band noise generated by either source does not interfere with the other. In a further embodiment the generation of the frequency dependent impedance is implemented by using a feedback circuit that feeds a signal representing current sensed on the loop back into the transmit driver.

Method and apparatus for combining voice line card and xDSL line card functions

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Kanata, Canada

Mark Feeley