The document discusses the Sky X gateway technology which improves data transmission performance over satellite networks. The Sky X gateway replaces TCP with XTP for satellite segments, improving throughput by 3 times. It consists of gateways, clients, and servers that split TCP into segments, using XTP over satellites to enhance performance without requiring client/server modifications. The Sky X protocol utilizes efficient acknowledgment and rate control algorithms to maximize throughput.

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2. LIST OF CONTENTS
1. Introduction.
2. Sky X Gateway Operation.
3. XTP
4.Mental Sky X Gateway
5. Sky X Performance.
6. Sky X Protocol Design.
7. Sky X Accelerator.
8. Merits
9. Packeteer
10. Conclusion
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3. Satellites are more attractive option for internet.
The Sky X gateway replaces TCP over satellite link.
Enhance the performance of data transmission over satellite
directly, thereby web performance increases by 3 times.
The Sky X family consists of Sky X Gateway, Sky X Client
and Sky X Server and the Sky X Oem products.
XR10, XH45, XH155 are the gateway models.
SS10, SS45, SS155 are the gateway server.
Introduction
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4. TCP connection from the Client and convert the data to XTP
for transmission
Translate the data back to TCP
Improve the performance with the internet infra-structure.
No modifications are required in Client/Server
Architecture call TCP Performance Enchaining Proxy.
Sky X Gateway Operation
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5. Sky X Gateway Splits
the TCP into three
Components:
1. TCP connection
Between the Client and
Sky X gateway.
2. An XTP connection
Involves Sky X protocol
over the Satellites
between the two Sky X
Gateways.
3. TCP connection between
opposite Sky X Gateway and
Server.
XTP is transport layer protocol design to operate over high speed network
and provides high level performance to the End-Users.
Contd..
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6.  XTP defines the delivering user data from one end system to
one or more other end systems.
 Each XTP implementation maintains the state of each of its
communications. Well-defined packet structures, containing user
data or control information, are exchanged in order to effect the
user data transfer.
 The collection of information comprising the XTP state at an
end system is called a context. This information represents one
instance of an active communication between two (or more)
XTP endpoints.
XTP PROTOCOL
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7.  XTP provides all the functionality of TCP and UDP.
 XTP supports a reliable transport multicast capability.
 The underlying priority system guarantees high
performance and latency control for real-time
embedded systems
 XTP's design scales from LANs to MANs to WANs
without alteration
Advantages of XTP
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8. Manufacturing Detail:
• remote hub and bring high network performance
to lower BW network
Sky X Client/ Server:
• increases the throughput and efficiency of
network , by replacing TCP with XTP for the
satellite segment connection
Sky X Multi Cast Fan-Out:
• it allows to send multiple recipient through single
data stream and powerful tool for satellites.
Mental Sky X Gateway
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9. The performance of Sky X gateway depends on many factors:
 CPU utilization
Memory utilization
Active connection
Throughput
Fig:
Sky X Performance
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11. Efficient Acknowledgment Algorithms: The Sky X Protocol
utilizes a highly efficient selective retransmission algorithms for
the acknowledgment of data.
Rate Control: Instead, the Sky X gateway uses a rate control
mechanism to explicitly set the transmission rate to exactly the
BW of the link, thereby providing the maximum throughput
possible at all times.
Fast Start Web Acceleration
Data Compression
Applications
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12.  Increases web performance
 Does not require any modifications to end client and
servers
 Sky X Gateway provides fast, efficient, fully reliable
multicast file transfers
Merits of Sky X Gateway
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13. Functions:
 Accelerate file transfers, large and small
 Speed XML and HTTP sessions, disaster recovery,
database sync and backups
 Optimize application performance over high-latency and
satellite links
 Maximize bandwidth utilization
 Allows retransmission and recover more quickly from
errors
Sky X Accelerator
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14.  Packeteer's Sky X Accelerators improve TCP-based application
performance including FTP file transfers, e-mail and Web
access.
 The appliances also provide acceleration capabilities for
disaster recovery, database synchronizations, high-
bandwidth environments such as satellite or datacenter-to-
datacenter links.
 The system supports link speeds ranging from 2 - 45 Mbps.
 The Sky X 250 Accelerator is available now and its Pricing for
the Sky X 250 appliance starts at $2,500
Packeteer Sky X
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15.  A product called Xip Link which is under developing will
replace the Sky X.
 It is very much the same as the Sky X with extra
capabilities.
 It optimize all TCP/IP traffic, basically the link itself.
Future Development
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16.  Thus Sky -x technology is best suited for satellite
communication using XTP protocol and Sky x
gateway.
 The Sky X system of a satellite network allows users
to take full advantage of the available bandwidth
 It gives all features required for successful data
Transmission.
Conclusion
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17.  Sky X User Guide Tenth Edition
 Wikipedia
References
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