Glossary
Glossary-3
3825-A2-GB30-40
January 1999
Customer 1
A user-defined configuration area containing customized configuration options for a specific
application.
Customer 2
A user-defined configuration area containing customized configuration options for a specific
application.
data bank
An area within the modem used to store the modem’s firmware.
data carrier
A continuous frequency signal that can be modulated by another signal that contains information
to be transmitted.
data compression
The elimination of empty fields, redundancies, and gaps in order to reduce storage capacity needs
and the amount of data to be transmitted. Anything that is eliminated is restored after the data is
received.
Data mode
One of two general modem operating modes. When in Data mode, the modem transmits and
receives data instead of accepting commands.
DB-25 connector
A 25-pin connector that is used to connect a cable which enables communications between two
devices.
dBm
A decibel referenced to one milliwatt into 600 ohms. This unit measures relative signal power.
DCE
The equipment (Data Communications Equipment or Data Circuit Terminating Equipment) that
provides the functions required to establish, maintain, and end a connection. This equipment also
provides the signal conversion required for communication between the DTE and the telephone
line. A modem is a DCE.
DCP
Diagnostic Control Panel. The front panel of modems such as the 3810Plus, or the shared
controller of nest-mount modems such as the 3811Plus. The DCP permits control and
configuration of local and remote modems.
demodulation
The process of recovering data from a modulated carrier wave.
dial command modifiers
A modifier used in the dial string that instructs the modem how to process a dialed telephone
number.
dial line
A communications circuit that is established by a switched circuit connection in the dial network.
dial network
See PSTN.
dial string
A series of characters that consists of numbers and modifiers used to dial a telephone number.
digital signal
A signal composed of only two discrete values, representing the binary digits 0 and 1.
directory location
Nonvolatile memory that stores up to ten telephone numbers. Each directory location can have up
to 40 characters entered.
DOC
Canadian Department of Communication.
download
A process that transfers modem firmware from a locally attached PC to a modem or allows the
cloning of firmware from a local modem to a remote modem. Also, the process of moving data
from a host computer to an attached computer.
DTE
Data Terminal Equipment. The equipment, such as a computer or terminal, that provides data in
the form of digital signals for transmission.
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