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U-90E Data/Fax Modem
Originate: In a modem connection, one modem must work in the originate mode, the other in the answer
mode.
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 connection, 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 asynchronous 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
PHONE: Jack to which a telephone set may be connected.
Processing unit: A computer's brain. Here all the necessary calculations are performed.
Protocol, file transfer: Many protocols have been developed to ensure reliable data transfer at maximum
speed, among them Xmodem, Ymodem, Zmodem and Kermit. With modern modems, the use of
integrated hardware protocols (MNP4 and V.42) is recommended. The G-flavors of the above mentioned
Ymodem and Zmodem allow transfers of multiple files with no additional error correction.
Public Domain: A special form of distributing software. Public domain software authors 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
F
AT
computers.
Glossary
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