Manoj Datt presented on the Sky X technology for improving performance over satellite links. The Sky X system uses Xpress Transport Protocol (XTP) and a Sky X Gateway to optimize data transfer speeds over satellites. TCP is not well suited for satellite conditions that involve long delays and packet loss. However, with Sky X Gateways on either side of the satellite link performing TCP to XTP conversion, performance can be increased up to 3 times for web usage and 10 to 100 times for file transfers, without any changes required to end clients and servers. The Sky X technology provides a reliable and efficient solution for satellite communication networks.

1. Presented By Manoj Datt
From IT 3rd Year

2. Content
 Introduction.
 Why Sky X Technology ?.
 Performance of TCP over satellite.
 Sky X Gateway.
 Comparison B/W TCP and Sky X
 Advantage of XTP.
 Application.
 Merits.
 Conclusion.

3. Introduction:
 Satellite is an option for carrying Internet and
other IP traffic to many location across the
globe.
 The Sky X technology has replaced TCP over
satellite link with protocol optimized.
 Adding Sky X system to the satellite network
,allows user to take full advantages of the
available bandwidth.

4. Conti.To Introduction
 The Sky X increases the web performance by 3
times or more and file transfer speeds by 10 to
100 times.
 The Sky X solution is entirely transparent to end
user.
 The Sky X family consists of Sky X Gateway,
Sky X Client and Sky X Server and the Sky X
OEM products.

5. Why Sky X technology?
 Satellites are ideal for providing Internet and
private network access over a long distance and
to remote location.

6. Performance of TCP over satellite
 Communication over geosynchronous satellites,
orbiting at an altitude of 22,300 miles has round
trip times of approximately 540 m/s.
 The journey through the atmosphere can introduce
bit errors into the data stream.
 These factors, combined with backchannel
bandwidth typically much smaller than that
available on the forward channel, reduce the
effectiveness of TCP which is optimized for short
hops over low-loss cables or fiber.

7. Continue.
 TCP is designed for efficiency and high performance
,and optimized for maximum throughput and the
highest transaction speeds in local networks.
 The satellite conditions adversely interact with a
number of elements of the TCP architecture.
 Including:
 window sizing,
 congestion avoidance algorithms, and
 data acknowledgment mechanisms.

8. Sky X Gateway
 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.
 The Sky X gateway on the opposite side of the
satellite link translates the data back to TCP for
communication with the server.
 No changes are required to the client or server and all
applications continue to function without
modification.

9. Continue..
 This architecture is also referred to as (TCP-PEP).

10. Continue..
XTP is transport layer protocol design to operate over
high speed network and provides high level performance
to the End-Users.

11. Comparison B/W TCP and Sky X
Factor TCP Sky X
Speed
(for an 8 Mbps satellite
having 50 simultaneous
connections)
3.0 sec 0.7-1.1 sec
Bandwidth
(for 10mbps satellite )
1.5 mbps 5.8 mbps at
uncompressed data
15.1mbps at
Compressed data

12. Advantage of XTP
 XTP provides all the functionality of TCP and UDP.
 XTP supports a reliable transport multicast capability.
 XTP's design scales from LANs to MANs to WANs
without alteration .
 The XTP protocol also supports the TCP congestion
avoidance algorithm to keep the terrestrial network
stable and protected.

13. Application
 Used for Satellite communication.
 Used to access web in faster speed.
 Used to enhanced the data transfer and file
transfer speed.
 Provide better reliability.

14. Merits
 Increase Web performance 3 time faster.
 Does not requires any modification to end
client and server.
 Sky X Gateway provides fast ,efficient, fully
reliable multicast file transfers.

15. Conclusion.
 Sky X technology is best suited for Satellite
communication using XTP and Sky x Gateway.
 Sky X system of satellite network allows user
to take full advantage of available bandwidth.
 It gives all features required for successful data
transmission.