Digicom 3910 Constant carrier, Mode Control Channel, Control modem, Controlled carrier, Customer

Glossary

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
mode	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 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
(DC)	the NMS diagnostics to downstream devices.
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
modifiers	number.
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-3