Glossary

Backbone
High-capacity network infrastructure; the part that carries the heaviest traffic. The backbone is also that part of the network that joins LANs together - either inside a building or across a country. LANs are connected to the backbone by bridges and/or routers; the backbone serves as a communications highway for LAN-to-LAN traffic.
Central Office
TBTC building where end users' lines are joined to switching equipment that connects other end users to each other, both locally and via long distance carriers. The central office contains the associated inside plant network elements required to perform this function, such as distribution frames, interoffice facility termination points, and so on. Also known as End Office and Entity.
Digital Subscriber Line (DSL)
DSL (Digital Subscriber Line) is broadband technology that provides high-speed data transmission (up to 7.1 Mbps) over an existing telephone line. Speeds are up to 50 times faster than a standard 28.8 Kbps dial-up modem. Plus, DSL Service is instant - with one click you have a lightning-fast connection to the Internet. With DSL, you use a single telephone line for high-speed data communications, including uploading and downloading multimedia. You can also use the same line simultaneously for voice or faxing. Connections are virtually continuous. There are no call setup delays or busy signals. Employees working from home can access their company's data network quickly and efficiently with the speed afforded by DSL service. DSL technology also provides broadband connectivity for high-speed services such as video-on-demand, home shopping and distance learning.
DSL
See Digital Subscriber Line
Fiber Optics
Communications technology that uses thin filaments of glass or other transparent materials. Fiber optic technology offers extremely high transmission speeds, allowing for data-intensive services such as video on demand.
Fiber to the Home (FTTH)
Fiber optic access to the end user residence for telephony, video and other multimedia services where each home has a direct fiber connection.
Outside Plant
Includes facilities, equipment and other material connecting the TBTC central office building to the end user premise or another central office; for example, cable, poles, manholes, drop wires, etc.
Private Branch Exchange
A PBX (private branch exchange) is a telephone system within an enterprise that switches calls between enterprise users on local lines while allowing all users to share a certain number of external phone lines. The main purpose of a PBX is to save the cost of requiring a line for each user to the telephone company's central office. The PBX is owned and operated by the enterprise rather than the telephone company (which may be a supplier or service provider, however). Private branch exchanges used analog technology originally. Today, PBXs use digital technology (digital signals are converted to analog for outside calls on the local loop using plain old telephone service (POTS).
Wireless Internet Service
Wireless Internet service is a method of delivering broadband Internet service via radio frequencies from fixed points, such as radio towers, to other fixed points, such as homes or businesses.