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COMSPHERE 3900 Series Modems
GL-4 November 1996 3910-A2-GN32-30
constant carrier mode The modem transmits a carrier signal constantly, regardless of
RTS.
Control Channel (CC) The diagnostic interface between an NMS and a network device.
control modem A control modem polls downstream tributary modems across the
analog channel.
controlled carrier mode The modem’s transmitter turns on and of
f in response to R
TS. This
mode is used by multipoint tributary modems.
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 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 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
communication between two devices.
dBm A decibel referenced to one milliwatt. 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.
DCP Diagnostic Control Panel. The face of the modem that
continuously provides status information about the modem’s
operation and allows an operator to manage its operation. This is a
generic term used for both the standalone and carrier-mounted
models. See SDCP
.
demodulation The process of recovering data from a modulated carrier wave.
DevHS
Device Health and Status. A detailed account of device alarms.
Diagnostic Channel (DC)
The diagnostic interface between two network devices, used to
extend the NMS diagnostics to downstream devices.