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Glossary-7
RS: Abbreviation of recommended standard.
RTS/CTS: See CTS/RTS.
RXD: Line for the received data on a serial port following RS-232C.
Security function: Features of the ZyXEL modems which help deny illegitimate con-
tacts to your computer system through telephone lines.
Self-test: Ability of the modem to check its components and operations for faults.
Serial port: Communication path through which data is transferred bitwise. Only
one wire each is available for transmitted and received data.
Shareware: A distribution method for software. The author lets the user try out the
fully functional software for a certain amount of time at no charge. If the customer
wants to keep and use the product after the period, he must pay the requested fees.
This method depends heavily on the honesty of the user.
Signal to noise ratio: A measure for the signal quality of a connection.
SILENCE: Status detected in voice mode. If the modem returns a silence message, no
voice energy was detected after a connection was established.
Speech digitalization: Changing spoken sound into digital data which can be pro-
cessed and saved by a computer.
S-register: Abbreviation of status-register. The currently used parameters are stored
in the status registers. S-registers are a part of the modem's internal memory.
SREJ: Selective Reject - extension of the V.42 protocol which allows the more effi-
cient handling of retransmission of erroneous data blocks.
Start bit: In asynchronous transfers, a new character is introduced by the start bit.
Symbol speed: Speed at which a signaling unit is transferred. In modern modem
modulation, a signaling unit is no longer a single bit. Thus, the bit speed is different
from the symbol speed.
Stop bit: In asynchronous transfers, every character is terminated by one or two stop
bits which show where a character ends.
Synchronous : In synchronous transfer, a dedicated control signal line transmits a
clock signal which paces the transmitted data. In highspeed connections, the transfer
between two modems is always synchronous, even if the DCE to DTE connection
is asynchronous.
T.30: A standard for fax transfers.
TAE6: A standard for a telephone wall outlet used in some countries, particularly in
Germany.