digital cellular networks are headend required to provision the service. This is an The control center of a cable television "always on" data service that users do not system where incoming video signals are have to dial into to access. Its data rates are received and converted into a format com- lower than EDGE and 3G protocols. patible for transmission to subscribers and combined with other signals onto the cable GPS (Global Positioning System) operator's fiber infrastructure. Used for locational tracking purposes. For example, many wireless E-911 systems are HDTV (High-Definition Television) based on GPS satellites along with equip- A standard for digital high-resolution televi- ment at a carrier's cell stations and special sion video and surround sound audio. handsets. home page GSM (Global System for Mobile Communications) The default first page of an Internet web site. The most widely deployed cellular service, A home page is analogous to the first page and table of contents of a book. worldwide. It is a digital service that was first used in Europe in the 1990s. hotspot H.320 A public area where people with Wi-Fi- The standard for enabling video conference equipped laptops or personal digital assis- equipment from multiple vendors to commu- tants can access the Internet. Access might be nicate with each other by using ISDN service. free or available for monthly or daily rates. Glossary HTML5 (Hypertext Markup accessed on a common IP platform available Language 5) from mobile as well as wired networks. A language for structuring browsers and web sites. The World Wide Web Consortium Indefeasible Right of Use (IRU) (W3C) specifies the standard. Its goal is to Long-term lease for fiber-optic cable runs. make browsing the Web from mobile devices IRUs are analogous to condominium arrange- faster, particularly for accessing video and ments. One organization lays the cable and other applications directly from browsers leases it to another carrier for its exclusive without using specialized plug-in languages. Apple