Glossary

D

Dotted decimal notation - An IP address consists of 32 bits. Rather than working with 32 bits at a time, it is a common practice to segment the 32 bits of an IP address into four 8-bit fields called octets. Each octet is converted to a decimal number (the Base 10 numbering system) in the range 0-255 and separated by a period (a dot).

Dynamic Host Configuration Protocol (DHCP) - a communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.

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E

Enterprise - an entity autonomously operating a network using TCP/IP and in particular determining the addressing plan and address assignments within that network.

G

Gateway - the receive modem, the transmit modem, and the Gateway host when cabled together form the Gateway. Also called the DW4020.

Gateway host - downloads code to the IRU, performs PEP and decompression functions, and monitors and controls the operation of the IRU/ITU. In addition, the Gateway host supports configuration, status monitoring, and commissioning using a "dumb terminal" connected to an asynchronous serial port.

H

Host - In packet- and message-switching communications networks, the collection of hardware and software that makes use of packet or message switching to support user-to-user, i.e., end-to-end, communications, interprocess communications, and distributed data processing. More simply, any computer that has full two-way access to other computers on the Internet.

I

Internet Assigned Numbers Authority (IANA) - the organization that has overseen the allocation of Internet Protocol addresses to Internet service providers (ISPs).

Internet protocol (IP) - The method or protocol by which data is sent from one computer to another on the Internet. Each computer (known as a host) on the Internet has at least one IP address that uniquely identifies it from all other computers on the Internet. The protocol within TCP/IP that governs the breakup of data messages into packets, routing the packets from sender to destination network and station, and reassembling the packets into the original data messages at the destination.

Internet service provider (ISP) - A business that supplies Internet connectivity services to individuals, businesses, and organizations. Some ISPs are large national or multinational corporations that offer access in many locations, while others are limited to a single city or region.

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Hughes DW4020 manual Glossary