초록 ▼

A system and method for using forward error correction (FEC) to improve transmission reliability for data packets transmitted over packetized data networks, such as voice packets transmitted over an Internet Protocol (IP) network is disclosed. Packets containing error data are transmitted separately

A system and method for using forward error correction (FEC) to improve transmission reliability for data packets transmitted over packetized data networks, such as voice packets transmitted over an Internet Protocol (IP) network is disclosed. Packets containing error data are transmitted separately from corresponding voice packets. The error packets are transmitted a predetermined number of frames before the voice packets, to increase the probability that either the voice packet or error packet will be received. The error packets are preferably created using a Reed-Solomon algorithmn. The amount of error correction transmitted may be adaptively adjusted based on the reliability of the network connection.

대표청구항 ▼

A system and method for using forward error correction (FEC) to improve transmission reliability for data packets transmitted over packetized data networks, such as voice packets transmitted over an Internet Protocol (IP) network is disclosed. Packets containing error data are transmitted separately

A system and method for using forward error correction (FEC) to improve transmission reliability for data packets transmitted over packetized data networks, such as voice packets transmitted over an Internet Protocol (IP) network is disclosed. Packets containing error data are transmitted separately from corresponding voice packets. The error packets are transmitted a predetermined number of frames before the voice packets, to increase the probability that either the voice packet or error packet will be received. The error packets are preferably created using a Reed-Solomon algorithmn. The amount of error correction transmitted may be adaptively adjusted based on the reliability of the network connection. rows of drives including the failed drive if only one drive is failed in that logical row, and if more than one drive has failed in that logical row, from said column error correction data for the one of said logical column of drives including the failed drive if only one drive is failed in that logical column and no column stripes have been modified for that logical column since the last update of said column error correction for that column. 10. A data storage system, comprising: a plurality of disk drives logically arranged to form a two-dimensional disk drive array having a m+1 rows and n+1 columns where m≥2 and n≥2, and wherein each disk drive comprises q data storage regions where q≥1, and wherein each row of the disk drive array comprises q row stripes, and wherein each row stripe includes a different one of the q data storage regions of each of the n+1 disk drives in the same row, and wherein each column of the disk drive array comprises q column stripes, and wherein each column stripe includes a different one of the q data storage regions of each of the m+1 disk drives in the same column; a disk array controller coupled to each of the plurality of disk drives and configured to group data to be stored in a given row stripe during a write operation, to calculate a row parity block for the given row stripe, and to calculate a column parity block for each column stripe modified during the write operation; and wherein the disk array controller is configured to either: (i) calculate the row parity block for the given row stripe before completing the write operation, and delay the column parity block calculations until after the completion of the write operation, or (ii) calculate the column parity blocks before completing the write operation, and delay the row parity block calculation until after the completion of the write operation. 11. The data storage system as recited in claim 10, wherein m+1 rows include a first m rows and a last row, and wherein the n+1 columns include a first n columns and a last column, and wherein the first m rows and the first n columns include data disk drives for storing data, and wherein the last row includes n parity disk drives for storing column parity information, and wherein the last column includes m parity disk drives for storing row parity information. 12. The data storage system as recited in claim 11, wherein a disk drive location in the last row and the last column is empty. 13. The data storage system as recited in claim 10, wherein n of the data storage regions of each row stripe are used to store data blocks, and wherein the remaining data storage region of each row stripe is used to store a row parity block, and wherein the row parity block is dependent upon the n data blocks of the row stripe. 14. The data storage system as recited in claim 13, wherein the disk array controller is configured to calculate the row parity block for a given row stripe as an exclusive-OR of the contents of n data blocks of the row stripe. 15. The data storage system as recited in claim 10, wherein m of the data storage regions of each column stripe are used to store data blocks, and wherein the remaining data storage region of each column stripe is used to store a column parity block, and wherein the column parity block is dependent upon the m data blocks of the column stripe. 16. The data storage system as recited in claim 15, wherein the disk array controller is configured to calculate the column parity block for a given column stripe as an exclusive-OR of the contents of m data blocks of the column stripe. 17. The data storage system as recited in claim 10, further comprising a memory for storing information used to track the parity block calculations delayed by the disk array controller. 18. A method for storing data within a plurality of disk drives logically arranged to form a two-dimensional disk drive array having a plurality of rows and columns, wherein each disk drive comprises a