U-90E
Data/Fax
Modem
Glossary
E
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 to create a global community
for information exchange.
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.
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.
LED
: Light Emitting Diode - a display element.
LINE
: The jack on the rear panel which is connected to the wall phone outlet.
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.
MNP
: Protocols for error correction and data compression from Microcom, Inc.
Modem
: An artificial word concatenated from
mo
dulator and
dem
odulator. 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.
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.
