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bit-mapped registers . An S-register which contains multiple bit-
oriented values. Example: the value of S22 is the sum of the bit values
which you select (bits 0-1: speaker volume/value: 0-3; bits 2-3:
speaker control/value: 0-3; bits 4-6: limit result codes/value: 0, 4-6, 7).
blind dialing . An automated process whereby the modem goes off-
hook and dials without waiting for a dial tone. This is prohibited in
many countries.
block transfer control . Determines whether or not the modem uses
block or stream mode during an MNP connection. In stream mode,
MNP sends data frames in varying length. Block mode sends fixed
data frames of 256 characters and is selected with the MNP-based \L
command.
bps . bits per second.
break handling . Determines how the modem responds when a
BREAK signal is received from either the DTE (Data Terminal
Equipment or computer/terminal) or the remote modem. This is
controlled by the MNP-based AT extended command \K. A break
signal is represented on the communications line by a steady space
signal for a significant length of time. Break signals may be activated
from the keyboard by pressing the BREAK key or the control (CTRL)
and C keys.
C
CCITT
. Consultative Committee for International Telephone and
Telegraph. This advisory organization is part of the ITU (International
Telecommunication Union) which is an agency of the United Nations.
Organization recently renamed International Telecommunications
Union-Telecommunications Standards Sector (ITU-TSS)
command mode . The modem is in command mode when it is turned
on or reset, when it loses its connection to a remote modem, when it
is in on-line mode, or when escape characters (+++) are typed. To
transmit data, the modem must be in data mode. The modem does
not transmit data when in command mode.
communications protocol
. A set of procedures which controls how a
data communications network operates.
D
DCD
. Data Carrier Detect. Indicates to the terminal device that the
modem is receiving a valid carrier signal from a remote modem. The
carrier is a tone at a specified frequency.
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