
Overview Installation Troubleshooting Contact | FAQ Specifications | Glossary | License |
Configuration: Basic Gateway TCP/IP | Wireless Print Server | USB | |
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H.323 | A suite of protocols created by the ITU for interactive |
| applications such as VoIP. |
Network where only one device at a time can transmit data. See also | |
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 |
| 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 |
| 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 |
| value decreases. |
host | In IP, a host is any computer supporting |
| 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 |
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. |
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 |
| 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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