A series of standards that let you share an on-line document in real-time with several users. Because these standards were created by the ITU-T (International Telecommunications Union), a United Nations-based organization, they can be used by any vendor. These are the standards that let you look at a computer screen along with several other people at other locations and draw all over it. The standards let you send files and work on multisite "whiteboards." When you hear about multimedia call centers where agents and customers can fill out forms together or edit a word processing file in real-time together, the T.120 standards are what's behind it all.

Also spelled T1. A digital transmission link with a capacity of 1.544 Mbps (1,544,000 bits per second). T-1 uses two pairs of normal twisted wires, the same as you'd find in your house. It normally can handle 24 voice conversations, each one digitized at 64 Kbps. But, with more advanced digital voice encoding techniques, it can handle more voice channels. T-1 is a standard for digital transmission in the United States, Canada, Hong Kong and Japan.

T-1 lines are used for connecting networks across remote distances. Bridges and routers are used to connect LANs over T-1 networks. There are faster services available. T-1 links can often be connected directly to new PBXs and many new forms of short haul transmission, such as short haul microwave systems. It is not compatible with T-1 outside the United States and Canada. In Europe T-1...