The Sky X FTP multicast facility is designed to provide multicast fan-out functionality tailored specifically for use with FTP, combining the power of multicasting with the convenience of the well-known and ubiquitous FTP utility. However many implementations of TCP are limited to maximum window size of 64 KB and most operating systems use a default window size of only 8 KB , imposing a maximum throughput rate over a satellite link of only Kbps per connection , regardless of the bandwidth available. Satellites are an attractive option for carrying Internet and other IP traffic to many locations across the globe where terrestrial options are limited or price prohibitive. This wastes available bandwidth when it transmits at too low a rate, and causes unnecessary retransmissions when it transmits at a rate higher than the bandwidth of the link. The Sky X gateway can also be used in multilink configurations where a single Sky X gateway hub unit enhances the performance of multiple separate outbound links from a single uplink facility. Satellites are ideal for providing internet and private network access over long distance and to remote locations. The figure below shows the measured throughput on an error-free, 10 Mbps link.
At the heart of the Sky X system is the Sky X protocol , optimized to provide maximum throughput for satellite networks. The system supports link speeds ranging form 2 – 45 Mbps. New SkyX Accelerator Details. Satellites are an attractive option for carrying Internet and other IP traffic to many locations across the globe where terrestrial options are limited or price prohibitive. These results illustrate that TCP throughput drops rapidly as the round-trip time increases.
When the window becomes full, the sender stops transmitting until it receives ppaper acknowledgement. The Sky X system replaces TCP over satellite link with a protocol optimized for the long latency, high loss and asymmetric bandwidth conditions of the typical satellite communication.
Computer Science (CSE) Seminar Topic on Sky X Technology
These and other risks relating to Packeteer’s business are set forth in Packeteer’s Form K filed with the Securities and Exchange Commission on March 16,and Packeteer’s Form Qs and other reports filed from time to time with the Securities and Exchange Commission. However data networking over satellites is faced with overcoming the latency and high bit error rates typical of satellite communications, as well as the asymmetric bandwidth of most satellite networks.
Determine how much bandwidth is wasted from retransmissions. The Sky X gateway on the opposite side of the satellite link translates the data back to TCP for communication with the server.
For compressible dataSky X can provide throughput rates far greater than the link bandwidth.
The Sky X Protocol utilizes a highly efficient selective retransmission algorithm for the acknowledgment of data. Also use at both sides of the link in a point-to-link as well as in fully meshed networks. Forward-looking statements involve risks and uncertainties, which could cause actual results to differ materially from those projected. Performance benefits from applications rewearch than Web and file transfers depend on the characteristics of the applicationbut will typically fall between these two extremes.
In contrast, TCP sends a constant stream of acknowledgments over the reverse channel. PacketShaper systems utilize their layer 7 classification capabilities to automatically identify all applications running across the network.
Computer Science (CSE) Seminar Topic on Sky X Technology
TCP congestion avoidance mechanisms remain in place over the terrestrial connections to protect the stability of the routed network. By splitting the end-to-end TCP connectionthe segment over technilogy satellite can take advantage of the performance of XTP. The SkyX Accelerator is available now. Any data that is lost or corrupted is retransmitted, providing transfer reliability and rendering special FEC software unnecessary.
Researchh Sky X protocol is designed to respond efficiently to typical satellite latency, bit errors and asymmetric bandwidth conditions and to take advantage of optimizations possible on a single-path link with known bandwidth. XTP is an open standard developed by the XTP Forum, a non-profit organization composed of networking protocol researchers, implementers, and user organization.
PacketShaper is an application traffic and bandwidth management system that delivers predictable, efficient performance for applications running over the WAN and Internet. TCP uses Slow Start and Congestion Avoidance algorithms to determine a safe tecunology rate based on how quickly acknowledgments return. The Sky X multicast fanout, an integral component of the Sky X gateway, transparently converts TCP unicast connections into reliable multicast transfers.
The sky X client is ideal for use with any satellite receiver card or set —top box. Fast Start Web Acceleration.
Engineering Seminar Topics :: Seminar Paper: SKY X TECHNOLOGY
Users should expect tschnology results for any large, single- connection data transfer. The Sky X gateway can also be used in multilink configurations where a single Sky X gateway hub unit enhances the performance of multiple separate outbound links from a single uplink facility. Through the use of common TCP based applications such as FTP, the Sky X gateway can deliver a file to every remote etchnology across a wide area network with only a single multicast transfer.
Because there is only a single path over the satellite with no intermediate routing, any gaps in the packet sequence can be assumed to be data loss due to corruption rather than network congestion.
Each graph shows Sky X enhancement for three cases: Below are data for two typical applications across a range of conditions File Transfers.
The simple, heuristic data acknowledgment scheme used by TCP does not adapt well to long latency or highly asymmetric bandwidth conditions. Post a Comment leave your opinion. The appliances also provide acceleration capabilities for disaster recovery, database synchronizations and backups in high-latency, high-bandwidth environments such as satellite or datacenter-to-datacenter links.
The Sky X gateway works by transparently replacing TCP connections from the client and converting the data to Xpress Transport protocol XTP for the hop over the satellite link which is the protocol optimized for satellite conditions.
Increase link utilization on fat WAN links. Web Pre-Fetch functionality further enhances the performance of HTTP transfers over the satellite link by pro-actively retrieving the many embedded objects on a Web page along with the requested HTML page.