Table of Contents
Advertisement
constant carrier
The modem transmits a carrier signal constantly, regardless of RTS.
mode
Control Channel
The diagnostic interface between a network management system and a network device.
(CC)
control modem
It polls downstream tributary modems across the analog channel.
controlled carrier
The mode in which the modem's transmitter turns on and off in response to RTS. This mode is
used by multipoint tributary modems.
mode
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 compressed is restored after
the data is received.
Data mode
One of two general operating modes; the other is Command mode. When in Data mode, the
modem considers any input from the computer to be data and transmits it across the telephone
line to the remote modem.
dBm
A decibel referenced to one milliwatt into 600 ohms. This unit measures relative signal power.
DCE
Data Communications Equipment. The equipment that provides the functions required to
establish, maintain, and end a connection. It also provides the signal conversion required for
communication between the DTE and the network.
DCP
Diagnostic Control Panel. The front panel of a device that continuously provides status
information about the device's operation and allows an operator to manage its operation. A
generic term used for both the standalone and carrier-mounted models.
demodulation
The process of recovering data from a modulated carrier wave.
DevHS
Device Health and Status. A detailed account of device alarms.
Diagnostic Channel
The diagnostic interface between two network devices, like a DSU and a modem, used to extend
the NMS diagnostics to downstream devices.
(DC)
dial backup
A method of restoring service for data communications during a private line failure by switching
the data traffic to the public telephone network.
dial command
A modifier used in the dial string that instructs the modem how to process a dialed telephone
number.
modifiers
dial line
A communications circuit that is established by a switched circuit connection in the dial network.
dial network
See PSTN.
Dial Standby
One of a leased-line device's operational states. The Dial Standby mode allows the device to
switch back to leased-line operation while still maintaining the dial line.
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.
3910-A2-GN32-40
September 1998
Glossary
Glossary-3
Advertisement
Table of Contents
