29-03-2011, 11:08 AM
PRESENTED By-:
Prakash Upadhyay
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INTRODUCTION
• SKY- X Technology
• A Technology that use for remote access of internet through satellite.
• We can over come internet protocols restrictions by using the Sky X protocols.
• Sky X products are the leading implementation of a class of products
• known variously as protocol gateway TCP Performance Enhancing Proxy
• (TCP/PEP) , or satellite spoofer.
• PROTOCOLS
• TYPES OF PROTOCOL
• PROTOCOL SERVICES
• Importance Of Protocol:
• Why SKY-X ...?
• Architecture
• Sky-x Client
Sky-x Client Architecture
• Sky-X Server
• SKY-X Client Server
• CLIENT SERVER
• Sky-X Gateway
• Gateway System
• XTP- Connection
• XTP- Connection
• SKY - X Characteristic
CHARACTERISTIC
File Transfers
-The following file transfer tests illustrate the benefit of Sky X performance enhancement for different windows sizes, page link band-widths, round-trip times, and bit error rates. Users should expect similar results for any large, single connection data transfer. Each graph shows Sky X enhancement for three cases:
no compression, highly compressible text, and Corpus benchmark compressibility
Window Size and Link Speed vs Throughput
A default window size of 8 KB limits TCP throughput to less than 100 Kbps over satellite. Even on server operating systems using a 32 KB window, TCP is only able to reach a through-put of 440 Kbps.
• Sky X gateway overcomes this limitation, taking full advantage of the available bandwidth .
• Regardless of the window size of the client or server. For compressible data, Sky X can provide throughput rates far greater than the page link bandwidth.
Round-Trip Delay vs. Throughput
The Sky X gateway system removes the dependency of TCP on the round-trip time of the link.
These results illustrate that TCP throughput drops rapidly as the round-trip time increases.
In contrast, Sky X is able to maintain full usage of the page link regardless of the round-trip time.
For compressible text, Sky X consistently delivers throughput rates greater than the actual bandwidth.
Bit Error Rate vs. Throughput
The Sky X system overcomes the high sensitivity of TCP to the bit error rate of the link.
The throughput as a function of the bit error rate for a 10 Mbps satellite page link using a 1 MB TCP window.
Even at low error rates, TCP is able to deliver only 1.5 Mbps, while at an error rate of 110-5, TCP's throughput drops to less than 0.03 Mbps.
Sky X fully saturates the page link at low error rates and even at an error rate of 110-5, achieves 5.1 Mbps without compression and up to 15.8 Mbps for compressible data.
Web Performance
Unlike file transfers which typically consist of a single, large download, Web traffic is characterized by large numbers of short connections.
Fast Start feature specically optimizes Web performance by reducing time required to establish new connection.
The average response time for a mixture of 50 simultaneous web connections using the sky X gateway is between 0.7 and 1.1 seconds depending on the compressibility of the data, compared to 3.0 seconds with TCP.
Future Scope
CONCLUSION
The sky X gateway is the leading solution for overcoming the limitations of TCP/IP over satellite
ISP's, corporations, governments, and military organizations around the world rely on sky X gateway to enhance the performance of their satellite networks.
The world is reducing to a global village by the use of satellite communication and so the improvement in the rate of information interchange through satellite is a must and thus sky X technology becomes unavoidable.