 in pixels that provide chrominance and luminance information across a line of video information. A computer that processes data in a communications network. A network or system signal distribution point where multiple circuits convene and are connected. Some type of switching or information transfer can then take place. Switching hubs can also be used in Ethernet LAN environments in an arrangement whereby a LAN segment might support only one workstation. This relieves congestion through a process called micro-segmenting. The attribute by which a color may be identified within the visible spectrum. Hue refers to the spectral colors of red, orange, yellow, green blue and violet. A huge variety of subjective colors exist between these spectral colors. Huffman encoding A lossless, statistically based entropy-coding compression technique. Huffman encoding is used to compress data in which the most frequently occurring code groups are represented by shorter codes and rarely occurring code groups are represented by longer codes. The idea behind Huffman encoding is similar to that of Morse code in that short, simple codes are assigned to common characters and longer codes are assigned to lesser- used characters. Huffman coding, used in H.261 and JPEG, can reduce a test file by approximately 40%. hybrid fiber/coax Hybrid fiber-coax (HFC) is being used by the cable companies to provide local loop service. HFC uses fiber links from the central site to a neighborhood Glossary of Terms hub. Existing coax cable connects the hub to several hundred nearby homes. Once installed, HFC provides subscribers with telephone service over the cable and, in addition, interactive broadband signaling, which can support videoconferencing over the cable network. See Internet Corporation for Assigned Names and Numbers ICCAN See Internet Corporation for Assigned Names and Numbers frame Intraframe coding, as specified by the MPEG Recommendation in which an individual video frame is compressed without reference to other frames in the sequence. A