ZyXEL Communications Omni 288S User Manual page 133

Glossary
G3 fax : Several fax standards exist. Most available fax machines use the group 3 (G3)
standard. This standard defines the compression of graphic data and a transmission speed
of up to 14400 bps with an automatic fallback to 2400 bps if the telephone line is bad.
Handshake : At the beginning of a connection, the modems must negotiate and initialize
the protocols to be used and the speed at which the connection is to be established. This
negotiation phase and the following initialization phase is called handshake.
HDLC : High-level Data Link Control - protocol for synchronous transfer.
High-speed modem : A modem that works at bit rates higher than 9600 bps.
Hook-Flash : The hook-flash is a signal used in a dial sequence. This signal may be used
for call transfers or to request an outside line on certain PABX.
Hz : Hertz. A unit of measurement for frequency. Cycles per second.
Internet : The worldwide collection of networks and computers, linked together through
to create a global community for information exchange.
internet : Any collection of networks and computers, connected through a main network.
Interrupt : In a computer, some tasks must be performed regularly and without delay.
This is possible because the CPUs provide special interrupt vectors. These vectors 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.
ISP : Internet Service Provider. A company that provides subscribers with access to the
Internet, usually through telephone lines via modems.
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.
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