Ciena Corporation

Catena Networks, Inc.

Andreas Weirich

Andrew Deczky

Mark Feeley

Jonathan Boocock

Allan Isfan

Gudmundur Jim Hjartarson

Gudmundur &ldquo;Jim&rdquo; Hjartarson

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

A digital subscriber line access multiplexer overlay onto a digital loop carrier system for transporting high speed digital data over an existing backplane which carries voice, data, and test signals between voice line cards and a carrier line. The voice signals are time division multiplexed into frames. The system includes a data bus interface for impressing the high speed data on a subset of existing backplane buses for transport along the backplane and for retrieving high speed digital data from the backplane buses. The system further includes a plurality of data line cards for connecting to the backplane and backplane subset conductors, the data line cards being adapted to couple the high speed data between the subscriber line and the backplane, whereby the high speed digital data can be routed over the backplane subset to any of the digital data line cards without interfering with the voice signals routed to voice line cards.

System and method for overlaying DSL access multiplexer onto existing access systems

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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Stittsville, Canada

Andreas Weirich