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Glossary
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portion of the data block.
SYN
Synchronous Idle control character transmitted when the line is idle in synchronous
transmissions.
Synchronous
A data transmission in which the time between characters is fixed by synchronising the
transmitting and receiving communications equipment. The clock signal is typically derived from
the data stream in order to maintain synchronisation.
Sysop
System Operator. This is the person or organisation who controls and maintains a videotex or
bulletin board system. Most bulletin board systems display the name of their individual sysops
when you first log on.
T
Telecommunications
The transmission of information across long distances, such as over telephone lines.
Tele-downloading
See Software Downloading.
Teleload
See Software Downloading.
Teletext
A non-interactive information system that was the predecessor to videotex systems. Teletext
terminals consist of a specially modified television set and keypad to provide 24 lines of 40
column colour text and graphics. Connection is made to teletext systems by specially assigned
television broadcast channels, hence the need to use a television set. Videotex terminals cannot
access the information contained in a teletext system.
Terminal
An input/output device consisting of a typewriter-like keyboard and a display device, used for
communicating with a large computer. Any device capable of sending and/or receiving data over a
communications channel.
Terminal Emulation
Refers to the type of ASCII terminal your software will imitate (the control characters used to
perform certain screen and cursor movement tasks vary from one terminal to another).
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