Cyber Digital, Inc. - Customer Support

Analog Analog - Transmission employs continuously variable signal.

Asynchronous Transfer Mode - High bandwidth, low-delay, connection-oriented, packet switching technique requiring 53-byte, fixed-sized cells.

Backbone - An element of the network infrastructure that provides high-speed, high capacity connections among the network's physical points of presence. The backbone is used to transport end user traffic across the 17 metropolitan areas and across the United States.

Bandwidth - Refers to the maximum amount of data that can be transferred through a communication channel in a given time. It is usually measured in bits per second for digital communications.

Broadband - Systems that transmit data at high speed using high bandwidth capacity communication channel.

Central Office - Incumbent carrier facility where subscriber lines are connected to ILEC switching equipment.

Collocation - A location where a competitive carrier network interconnects with the network of an incumbent carrier's central office.

CLEC - Competitive Local Exchange Carrier; a category of telephone service provider that offers local exchange services in competition with those of the incumbent carrier.

Copper Line or Loop - A pair of traditional copper telephone lines using electric current to carry signals.

Digital - Transmission and switching technologies employ a sequence of binary digits to convey information.

DSL - Digital Subscriber Line. An analog transmission technology where binary digits are sent over analog transmission lines or local copper loop.

E-Commerce - Electronic Commerce. An internet service that supports electronic transactions between customers and vendors to purchase goods and services.

Firewall - A computer device that separates a local area network from the internet and prevents unauthorized access to the local area network through the use of electronic security mechanisms.

Frame Relay - A form of packet switching with variable length frames that may be used with a variety of communication protocols.

ILEC - Incumbent Local Exchange Carrier; a company providing local exchange services.

Interconnection Agreement - A contract between an incumbent carrier and a competitive carrier for the connection of a competitive carrier network to the public switched telephone network.

Internet - An array of interconnected networks using a common set of protocols defining the information coding and processing requirements that can communicate across hardware platforms and over many links.

Internet Protocol - A standard network protocol that allows computers with different architectures and operating system software to communicate with other computers on the internet. Advanced packet systems employ the Internet Protocol (IP) standard. 18

ISDN - Integrated Services Digital Network. A transmission method that provides circuit-switched access to the public network at speeds of 64 or 128 Kbps for voice or data transmission.

Internet Service Provider - A company that provides direct access to the internet.

Inter-exchange Carrier - Usually referred to as a long-distance carrier.

Kbps - Kilobits per second. 1,000 bits per second.

Mbps - Megabits per second. 1,000,000 bits per second.

Modem - An abbreviation of Modulator-Demodulator. An electronic signal-conversion device used to convert digital signals from a computer to analog form for transmission over the telephone network.

Packets - Information represented as bytes grouped together through a communication node with a common destination address and other attribute information.

Router - A device that accepts the Internet Protocol from a local area network and switches/routes Internet Protocol packets across a network backbone.

T-1 - This is a Bell System term for a digital transmission link with a capacity of 1.544 Mbps.