Hughes manual The Internet and the DW4020, Appendix B

Appendix B

The Internet and the DW4020

Internet protocol (IP) and transmission control protocol (TCP)

The Internet Protocol (IP) provides a format for moving packet data from node to node. The IP enables data to move from department to organization, to a region, across regions, to destination organizations, and to departments. The IP layer serves as the basis for other protocol layers, as shown in Table 10.

The transmission control protocol (TCP) verifies correct delivery of data. TCP detects errors or lost data. TCP initiates retransmission so that the data is eventually correctly received.

The use of these two protocols, together along with a suite of other protocols, has been given the official name TCP/IP internet protocol suite, or, more commonly TCP/IP.

Table 10: The Internet Protocol (IP) is the basis for other protocol layers

FTP – File Transfer Protocol	IP – multicast
• Reliable method for delivering files from a host	• Universal way to broadcast digital content to
machine to remote personal computers	multiple locations
	• Takes maximum advantage of DIRECWAY
	satellite star network topology
TCP – Transmission Control Protocol	UDP – User Datagram Protocol
• Session oriented protocol	• Datagram oriented protocol
verifies correct data delivery	method for delivering short messages between
• For delivering web pages and mission critical data	two points
	• Basis of IP-multicast
IP – Internet Protocol

• Format for moving data from node to node

• Basis for all of the above protocols

• Becoming de facto standard for digital transmission – data, video and audio

• Widespread acceptance in the corporate world

Turbo Intranet™ Turbo Intranet is an HNS technique that increases the TCP throughput across the satellite link. Turbo Intranet involves using local devices to answer TCP overhead messages in the place of distant devices. These devices efficiently send outroute data over the spacelink and buffer the data for transfer to local hosts within

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