Wireless Glossary (H)

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Handheld Device Markup Language see HDML.

Handheld Computer a portable, handheld computing device that acts as an electronic organizer. Handheld computers are typically used for managing addresses, appointments, to-do lists and notes, but some newer models support wireless Internet access, e-mail, and other interactive applications. Also referred to as PDAs, Handhelds come in two major flavors – Palm and Pocket PC.

Hand-Off the transfer of a cellular phone conversation from one cell to another as a phone moves through the service area. It is performed so quickly that callers don’t notice.

Handset a mobile or cell phone is often referred to as a handset.

Hands-Free a feature that allows users to conduct a conversation without holding the phone.

HDML (Handheld Device Markup Language) a language that allows certain web pages to be presented on cellular telephones and personal digital assistants (PDA) via wireless access.

HDR see CDMA2000.

Headset Jack allows an external headset/microphone accessory to be used with a phone so hands-free conversations can take place.

Hearing Aid Compatible enables hearing impaired persons to use a wireless device through their t-coil compatible hearing aids. (T-coil must be activated, not compatible with all hearing aids)

Hertz see Hz.

High Speed Circuit Switched Data System see HSCSD.

High-Speed Data support for one of the wireless high-speed data protocols (GPRS, 1xRTT).

Home Area the geographic area within which a wireless subscriber can call without incurring roaming or long distance charges. s

Home Only a mode that can be selected on a cell phone so that it will only operate within range of your home cellular system.

Horn Alert when activated, incoming calls will cause a vehicle’s horn to sound or headlights to flash to alert the user to return to the vehicle.

HSCSD (High Speed Circuit Switched Data System) enables the transmission of data over current GSM networks at speeds up to 43.2 kbps. HSCSD enables such high speeds by using multiple channels.

Hyperlink a phrase or word on a WAP page which, once highlighted and selected, links the user to another WAP page.

Hz (Hertz) the unit for measuring frequency equal to one cycle per second.

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