Motorola SBG1000 User Manual page 137

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H
H.323 A suite of
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
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
HFC A hybrid fiber/coaxial cable network uses fiber-optic cable as the
subscriber premises.
hop The interval between two routers on an IP network. The number of hops a
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
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
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
HPNA The Home Phoneline Networking Alliance (HomePNA) standard enables home network devices to
interact over existing telephone wiring without disturbing normal voice service. An HPNA network
processes, manages, transports, and stores data to enable telephones, fax machines, desktops,
laptops, printers, scanners and web cameras to connect and interoperate over home telephone wiring.
HPNA uses frequencies that are not used for phone modems or voice communications. HPNA can
work on a Digital Subscriber Line (DSL). Motorola is an HPNA participant.
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hub On a LAN, a hub is a device that connects multiple
See also
On an HFC network, a hub is a scaled-down
part of the system.
Hz Hertz — one cycle per second. The unit to measure the
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
medium.
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Configuration: Basic Gateway TCP/IP Wireless Print Server USB
protocols created by the ITU
packet
binary numbers.
bridge and router. An IP hub is typically a unit on a rack or desktop.
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for interactive video-conferencing, data sharing, and audio
that identifies what is in the packet.
hosts to the LAN. A hub performs no data filtering.
headend that performs some or all headend functions for
frequency
button.
SBG1000 Wireless Cable Modem Gateway User Guide
trunk and coaxial cable to the
packet traverses toward its
that an alternating electromagnetic
bandwidth of a transmission
(TTL)
IP