Paradyne 392xPLUS Circuit pack lock, Command mode, Compandor, Configuration area, Connector

Glossary

circuit pack lock	A screw lock tab installed over a circuit card's latch release tab to prevent the unit from
	being removed without a tool. It is used on SDUs, modems, and filler panels.
command mode	One of two modem operating modes. When in Command mode, the modem accepts
	commands instead of transmitting or receiving data.
compandor	A combination of a compressor at one point in a communication path for reducing the
	volume range of signals, followed by an expandor at another point for restoring the
	original volume range. Usually its purpose is to improve the ratio of the signal to the
	interference in the path between the compressor and expandor.
configuration area	One of five areas within the Configure branch containing modem settings. Configuration
	areas include Active (Operating), Active (Saved), Customer 1, Customer 2, and Factory.
configuration option	Modem software that sets specific operating parameters for the modem. Sometimes
	referred to as straps.
connector	An outlet on equipment and cables that provides a connection.
constant carrier mode	The modem transmits a carrier signal constantly, regardless of RTS.
Control Channel (CC)	The diagnostic interface between a network management system 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 off in response to RTS. 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.
DAA	Data Access Arrangement. Hardware that acts as a protective interface between the
	telephone circuit and the modem. It performs such functions as ring detection, DC
	isolation, and surge protection to protect the circuit from being disturbed by a modem
	malfunction. The 392xPlus modems contain three dip switches that allow the DAA
	hardware to be configured for use in different countries.
data bank	An area within the modem used to store the modem's firmware. There are two data
	banks in the 392xPlus modem.
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.

3920-A2-GN31-30 November 1996 Glossary-3