Motorola SBG900 manual Home Print Exit

Overview Installation Troubleshooting	Contact	FAQ	Specifications	Glossary	License
Configuration: Basic	Gateway	TCP/IP	Wireless USB

H

H.323	A suite of protocols created by the ITU for interactive video-conferencing, data sharing, and audio
	applications such as VoIP.
half-duplex	Network where only one device at a time can transmit data. See also full-duplex.
headend	A location that receives TV programming, radio programming, data, and telephone calls that it
	modulates onto the HFC network. It also sends return data and telephone transmissions. Headend
	equipment includes transmitters, preamplifiers, frequency terminals, demodulators, modulators, and
	other devices that amplify, filter, and convert incoming broadcast TV signals to wireless and cable
	channels.
header	The data at the beginning of a packet that identifies what is in the packet.
hexadecimal	A base-sixteen numbering system that uses sixteen sequential numbers (0 to 9 and the letters A to F)
	as base units before adding a new position. On computers, hexadecimal is a convenient way to
	express binary numbers.
HFC	A hybrid fiber/coaxial cable network uses fiber-optic cable as the trunk and coaxial cable to the
	subscriber premises.
hop	The interval between two routers on an IP network. The number of hops a packet traverses toward its
	destination (called the hop count) is saved in the packet header. For example, a hop count of six
	means the packet has traversed six routers. The packet hop count increases as the time-to-live (TTL)
	value decreases.
host	In IP, a host is any computer supporting end-user applications or services with full two-way network
	access. Each host has a unique host number that combined with the network number forms its IP
	address.
	Host also can mean:
	• A computer running a web server that serves pages for one or more web sites belonging to
	organization(s) or individuals
	• A company that provides this service
	• In IBM environments, a mainframe computer
HTML	Hyper Text Markup Language
hub	On a LAN, a hub is a device that connects multiple hosts to the LAN. A hub performs no data filtering.
	See also bridge and router. An IP hub is typically a unit on a rack or desktop.
	On an HFC network, a hub is a scaled-down headend that performs some or all headend functions for
	part of the system.
Hz	Hertz — one cycle per second. The unit to measure the frequency that an alternating electromagnetic
	signal cycles through its highest and lowest states. Used to define the bands of the electromagnetic
	spectrum used in voice and data communications, or to define the bandwidth of a transmission
	medium.

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