Gigabit - One billion bits
Gbps - An acronym meaning gigabits per second, and a measure of the capacity of a device.

IEEE - Institute of Electrical and Electronics Engineers. An organization that maintains the standards for 10BaseT and other communications standards.
ISDN - Integrated Services Digital Network. A system that provides simultaneous voice and high-speed data transmission through a single channel to the user's premises. ISDN is an international standard for end-to-end digital transmission of voice, data, and signaling.
Interexchange Carrier - Common carrier providing communications channels between local telephone companies (LECs or local exchange carriers). Also known as long distance carriers, such as AT&T, MCI, Sprint, WilTel, etc.
Internet - At its heart, the Internet is many large computer networks joined together over high-speed backbone data links ranging from 56 Kbps (now rare) to T1, T3, OC-1, and Oc-3. The Internet, in short, is a network of computer networks, now reaching worldwide. It is basically, a packet-switched network based on a family of networking protocols called TCP/IP, which stands for Transmission Control Protocol/Internet Protocol.