How is FASP different from Transmission Control Protocol ?
In this digital world, fast and reliable movement of digital data, including massive sizes over global distances, is becoming vital to business success across virtually every industry. The Transmission Control Protocol (TCP) that has traditionally been the engine of this data movement, however, has inherent bottlenecks in performance, especially for networks with high, round-trip time (RTT) and packet loss, and most pronounced on high-bandwidth networks. It is well understood that these inherent “soft” bottlenecks are caused by TCP’s Additive-Increase-Multiplicative-Decrease (AIMD) congestion avoidance algorithm, which slowly probes the available bandwidth of the network, increasing the transmission rate until packet loss is detected and then exponentially reducing the transmission rate. However, it is less understood that other sources of packet loss, such as losses due to the physical network media, not associated with network congestion equally reduce the transmission rate. In fact, TCP AIMD itself creates losses, and equally contributes to the bottleneck. In ramping up the transmission rate until loss occurs, AIMD inherently overdrives the available bandwidth. In some cases, this self-induced loss actually surpasses loss from other causes (e.g., physical media or bursts of cross traffic) and turns a loss-free communication “channel” to an unreliable “channel” with an unpredictable loss ratio.
The Transmission Control Protocol (TCP) provides reliable data delivery under ideal conditions, but has an inherent throughput bottleneck that becomes obvious, and severe, with increased packet loss and latency found on long-distance WANs. Adding more bandwidth does not change the effective throughput. File transfer speeds do not improve and expensive bandwidth is underutilized.
Unlike TCP, FASP throughput is independent of network delay and robust to extreme packet loss. FASP transfer times are as fast as possible (up to 1,000x standard FTP) and highly predictable, regardless of network conditions. The maximum transfer speed is limited only by the resources of the endpoint computers (typically disk throughput).
- Maximum speed and reliability
- Extraordinary bandwidth control
- Built-in security
- Flexible and open architecture
Why You Should download this e-Book?
In this paper we describe the alternative approaches to “accelerating” file-based transfers – both commercial and academic – in terms of bandwidth utilization, network efficiency, and transfer time, and compare their performance and actual bandwidth cost to Aspera FASP.