ZyXEL Elite 2864 User Guide - Page 241

each point to some short program sequence. An interrupt stops the currently running program and the segment to which the vector points is executed. ITU-TSS: International Telecommunications Union - Telecommunication Standards Sector. New name for the standard making organization CCITT. See CCITT. Jumper: A small device to close a contact. If the jumper TS2 is closed on a ZyXEL internal card model, the modem will go into self-test at the next power-on. LAPM: Link Access Procedure for Modems - a protocol which controls the handshake between two modems. Layer protocol: A standard of the ISO (International Standards Organization) which defines everything regarding data communications from the hardware to the screen display in seven levels. LCD: Liquid Crystal Display - a display device similar to those used in pocket calculators. The LCD on the Supreme model is backlit. LED: Light Emitting Diode - a display element. LINE: The jack on the rear panel which is connected to the wall phone outlet. Mailbox: Electronic letter box; BBS. Mailer: A program which works with a remote BBS and requests and distributes messages automatically. Memory: A fast storage component of a computer where data can be saved and from where it can be retrieved. Menu tree: The arrangement of all possible menu elements available from the ZyXEL LCD model's front panel. MNP: Protocols for error correction and data compression from Microcom, Inc. Modem: An artificial word concatenated from modulator and demodulator. A modem translates the digital signals received from its local DTE to analog signals which are transmitted via a telephone line. At the other end, the analog signals are demodulated and sent to the DTE as digital signals again. Modulation: Translating digital states to analog waveforms. NuBus: A bus system for plug-in cards for the Apple Macintosh computers. off-line: A modem which is not connected to another modem is off-line. on-line: A modem which is engaged in a connection with another modem is on-line. Originate: In a modem connection, one modem must work in the originate mode, the other in the answer mode. Glossary-5