Monday, October 7, 2002		ITerminology

D-channel: Short for Delta-channel, the channel in an ISDN connection that carries control and signalling information. Basic Rate ISDN (BRI) service consists of two 64 KBPS B-channels, and one D-channel for transmitting control information. Primary ISDN service consists of 23 B-channels (in the US) or 30 B-channels (in Europe).

Server-side include: Abbreviated SSI. A type of HTML comment that directs the Web server to dynamically generate data for the Web page whenever it is requested. The basic format for SSIs are <!—#command tag="value"…> where #command can be any of various commands supported by the Web server. The simplest command is #include, which inserts the contents of another file. This is especially useful for ensuring that boilerplate components, such as headers and footers, are the same on all pages throughout a Website..

Ham radio: Amateur radio communication in a range of frequencies from just above the AM broadcast band (1.6 MHz) to the microwave region, at several hundred GHz. These frequencies have been designated for amateur use by the FCC. Anyone with a radio receiver or a radio scanner can listen in on ham radio communications, but only an operator licensed by the FCC can transmit the signals. Typically, ham radio operators, or hams, do not use ham radio to broadcast in the way radio stations broadcast to large audiences at once. Ham transmission is usually two-way or with groups of people using a transceiver, meaning that two or more hams talk to each other instead of everyone listening to a single ham’s broadcast. Ham radio also is referred to as amateur radio.