Aspera

Key Features

• Delay and loss independent with near-zero overhead. At 10% packet loss, fasp achieves 90% of the targeted throughput with less than 1% redundant data overhead.

• Single transport stream. Unlike brute-force parallel TCP or similar protocols that divide a single file into constituent chunks and attempt to improve overall throughput through a parallel transmission, fasp achieves ideal efficiency with a single stream. In contrast, parallel TCP techniques exhaust system resources, don't work for small files, reduce speed on packet loss, and hog bandwidth from single stream flows.

• Perfect efficiency for large sets of small files. Using a novel file streamlining technique, fasp achieves the same ideal efficiency for transfers of large numbers of small files. For example, one thousand 2 MB files can be transmitted from the US to New Zealand with an effective transfer speed of 155 Mbps, filling an entire OC-3. As a result, fasp enables replication of large data sets, regardless of file sizes, at line speed on even the longest, fastest wide area networks.

• Distance neutral, fast, smooth progressive transfer. fasp supports progressive-style transfers where incoming data is processed during the transfer, such as feeding a media player. The transfer speed is maximum (for the earliest possible start of playback), and will not change with variable network conditions, in contrast to progressive download applications using HTTP that are slow to start playback, and may be plagued by glitches and interruptions due to congestion on the link.