General Datacomm, Inc.

Generaldata Corp

James Patrick Kurdzo

Robert Alan Zakrzewski

John Martin O'Neil, Iii

Alan B Katze, Jr

Daniel Paul Steinbach

A voice server module for an ATM switch is provided and generally includes an interface block which receives and multiplexes high speed preprocessed data, a voice processing block which compresses voice data and which is coupled to the interface, an ATM adaptation layer (AAL) processor which receives data from the voice processing block and which formats the data into ATM AAL2 format, and a management processor which configures the interface block, the voice processing block, and the AAL processor. The voice processing block includes an array of digital signal processors (DSPs), including at least two and preferably eight rows and at least two and preferably eight columns. Each row is also provided with a field programmable gate array (FPGA). Data transmission between (to and from) the FPGAs and DSPs is according to a frame. The FPGAs are utilized to direct data received from the interface block and from the AAL processor to appropriate DSPs for processing. The DSPs programmed to conduct various desired voice processing algorithms, including silence removal or insertion, ADPCM and CELP encoding and decoding, echo cancellation, fax/modem tone detection, etc.

ATM switch voice server module having DSP array

A voice server module for an ATM switch is provided and generally includes an interface block which receives and multiplexes high speed preprocessed data, a voice processing block which compresses voice data and which is coupled to the interface, a data bus for carrying compressed voice data, a flag bus for carrying flags generated by the voice processing block relating to the voice data, an ATM adaptation layer (AAL) processor coupled to the data bus and to the flag bus which formats the compressed voice data into ATM AAL2 format, and a management processor which configures the interface block, the voice processing block, and the AAL processor. For each byte of data sent serially on the data bus, at least one bit of flag data is sent on the flag bus. In one embodiment, the flag bits are used to indicate whether the data on the high speed data bus is valid or not, tone detection, silence removal, and the type of encoding being utilized. In a second embodiment, the flag bus is used both to synchronize the adaptation layer processing means and the voice processing means (preferably, according to a forty frame superframe of five milliseconds) as well as to send control information. The control information includes a bit which indicates whether the data is compressed or not, a bit to indicate silence, a bit to indicate tone detection, and a bit to indicate an out-of-data indication.

ATM switch voice server module utilizing flag signalling

A voice server module for an ATM switch is provided and generally includes an interface block which receives and multiplexes high speed preprocessed data, a voice processing block which compresses voice data and which is coupled to the interface, an ATM adaptation layer (AAL) processor which receives uncompressed data and compressed data and which formats the uncompressed data into ATM AAL1 format and the compressed data into ATM AAL2 format, and a management processor which configures the interface block, the voice processing block, and the AAL processor. The interface means receives data which originated from up to four E1 or T1 lines, and multiplexes the data into a high speed serial data stream. The data stream is then sent both to the voice processing block and to the AAL processor, with the voice processing block ignoring all but the voice data portion of the data stream, and the AAL processor ignoring the voice data portion of the data stream. In this manner, AAL1 data is passed directly to the AAL processor without burdening the voice processing block, while data destined to become AAL2 type data is passed to the voice processing block for compression and then forwarded in a compressed form to the AAL processor.

Voice server module for ATM switch

A time division multiplexer (TDM) is provided for multiplexing data from a plurality of channels. The TDM system generally comprises a high speed time division multiplexed digital data bus, a synchronizing bus, a plurality of channel cards coupled between the data channels and the data bus with each channel card having its own processor and memory, and a system communication manager (SCM) which is also coupled to the digital bus, and includes a (micro)processor. The processor of the SCM determines the frame for the system and initially forwards the frame information to each of the channel cards during predetermined time slots of the high speed data bus. The channel cards are synchronized by the SCM via the synchronization bus, and the channel cards use the synchronization information and the framing information in order to appropriately place data on and take data off of the high speed data bus without the use of an address bus. A system overhead frame (SOF) is also preferably multiplexed into timeslots of the high speed data bus. Thus, during operation, the high speed data bus multiplexes not only data from the channel cards, but system overhead information as well as framing information.

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Watertown, CT, United States of America

James Patrick Kurdzo