A communications network that provides services beyond normal transmission, such as automatic error detection and correction, protocol conversion, and message storing and forwarding. Images defined by sets of straight lines which are defined by the locations of the end-points.
Vector graphics require much less storage space than raster or bitmapped graphics.
The vertical blanking interval is being used in the United States to transmit data to television viewers. The new Intel Intercast system makes use of the VBI to broadcast data in HTML format to personal computers. Portion of the electromagnetic spectrum with frequencies between 30 and 300 MHz. Part of the VHF spectrum in the United States is assigned to channels 2-13 for broadcast television service. See Video Electronics Standards Association.