Abstract: A method and apparatus for providing fast data recovery with adaptive pulse code modulation (ADPCM) coding wherein, an ADPCM encoder periodically records the compressional parameters in memory together with regular compressed codes, and an ADPCM decoder retrieves the previously saved compressional parameters when reading the regular data from memory. In case any error occurs in the data compression and decompression processes which would cause a data divergence in the output of the ADPCM decoder, the previously saved compressional parameters can be used to correct the output data, thus enabling fast data recovery in the data outputting process without affecting downstream data in the data stream.

Abstract: The present invention relates to a method and apparatus for providing fast data recovery with adaptive pulse code modulation (ADPCM) coding. In this coding technique, an ADPCM encoder periodically records the compressional parameters in memory together with regular compressed codes, and an ADPCM decoder retrieves the previously saved compressional parameters when reading the regular data from memory. In case any error occurs in the data compression and decompression processes which would cause a data divergence in the output of the ADPCM decoder, the previously saved compressional parameters can be used to correct the output data, thus enabling fast data recovery in the data outputting process without affecting downstream data in the data stream. To further enhance data safety, Gray Code is applied in the compression process before writing data to memory.

Abstract: A switch assembly for connecting computers to SCSI peripheral devices in order to pipe data directly from computer to peripheral devices without the use of LAN switches or NICs. The assembly comprises a crosspoint switch having a plurality of input terminals and a like plurality of output terminals. The assembly also includes a like plurality of connection ports; and a like plurality of interconnection device. Each interconnection device is connected between a corresponding connection port and a corresponding input terminal. Each interconnection device includes an SCSI control section connected to the corresponding connection port and a switch control section connected to the corresponding input terminal. Each interconnection device also includes a CPU, a table memory, a buffer memory and an internal system bus connected to both sections, both memories and said CPU.

Abstract: Apparatus adapted to interconnect first and second remotely disposed crosspoint switches utilizing first and second component assemblies, each first and second assembly being associated with a corresponding one of the first and second switches. Each assembly includes an internal system bus connected in bi-directional manner to switch control sections, a data multiplexer and de-multiplexer, and a CPU with watch dog timer, and further includes a routing table connected to said CPU and an optical transceiver connected to the multiplexer and de-multiplexer. An optical fiber transmission cable interconnects both optical transceivers.