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Glossary-6
Packed data: Data from which redundant information has been removed. Some file
extensions denote packed files. Standard extensions are .ZIP, .ARC, .LZH, .TAR,
.ZOO and others. If you transfer packed data don't use MNP5 compression.
Parity: A method to check whether a character has been correctly transmitted in
asynchronous transfer. Usual settings are even parity and odd parity. In a connec-
tion, the modems at both ends must use the same parity settings.
Parity bit: The parity bit is sent as additional information with the data bits in asyn-
chronous transfers. It controls the integrity of the transferred data. If parity is even,
the parity bit is set if an uneven number of data bits is sent in the character, resulting
in an even number of set bits.
PC: Personal Computer - acronym for computers which are compatible with the
IBM PC or AT computers.
PHONE: Jack to which a telephone set may be connected.
Processing unit: A computer's brain. Here all the necessary calculations are per-
formed. The modems of the 2864 series are basically specialized computers.
Protocol, file transfer: Many protocols have been developed to ensure reliable data
transfer at maximum speed, among them Xmodem, Ymodem, Zmodem and Ker-
mit. With modern modems, the use of integrated hardware protocols (MNP4 and
V.42) is recommended. The G-flavors of the above mentioned Ymodem and Zmo-
dem allow transfers of multiple files with no additional error correction.
Public Domain: A special form of distributing software. Public domain software au-
thors make no claim to commercialize their rights.
QUIET: A state in the voice mode of ZyXEL modems. Quiet is detected after a long
pause in voice data.
RAM: Random Access Memory – working memory. The modem uses it among
many other uses to store information on sent, but not yet acknowledged data.
Redundancy: Extra data that does not generate additional information.
Remote location: The modem at the other end of the line (the one you are calling
or that is calling).
Reset: Return a device into a defined base status.
Retrain: The re-initialization process a modem is doing with the remote modem
when the receiving condition becomes bad.
ROM: Read Only Memory. The ROM holds the system software and the profiles
and settings of the modem (refer to EEPROM).