Paradyne 3910 Extended network, Extended result codes, Fallback, Forward Error, Correction FEC

COMSPHERE 3900 Series Modems

extended network	The extension of a circuit where the tributary DCE is connected to
	a downstream (extended) control DCE.
extended result codes	An asynchronous message (in either numbers or words) that
	includes VF data rate and error control information the modem
	sends to the DTE after executing or trying to execute a command.
fallback	Retraining at a lower rate or speed.
FCC	Federal Communications Commission. Board of Commissioners
	that regulates all interstate and foreign electrical communication
	systems that originate from the United States.
Forward Error	A method of error control for data transmission where the
Correction (FEC)	receiving device can detect and correct a character or block of code
	containing a predetermined number of erroneous bits.
Front-End Processor	A communications computer associated with a host computer that
(FEP)	manages the routing of data through the network.
full-duplex	Simultaneous, two-way communications.
function key	Any one of three keys on the DCP that allows you to select or
	increment an LCD entry. Function keys are labeled F1, F2, and F3.
half-duplex	Two-way data communications allowed in only one direction at a
	time.
handshaking	The exchange of predetermined codes and signals (tones) to
	establish a connection between two modems.
HDLC	High-Level Data Link Control. A communications protocol
	defined by the International Standards Organization (ISO).
host	A computer attached to a network that shares its information and
	devices with the rest of the network.
Hz	A unit of frequency (Hertz) that equals one cycle per second.
idle	A state in which the modem's operating parameters can be
	modified or commands can be issued to the modem using either
	AT commands or the DCP.
JM8	A jack used for leased-line networks. Pins 1 and 2 are the transmit
	pair and Pins 7 and 8 are the receive pair.
keypad	A set of seven keys surrounding the DCP's LCD. These keys are
	used to select configuration options and to maneuver through the
	DCP menu.
LCD	Liquid Crystal Display. A thin sandwich of two sealed glass plates
	containing liquid crystal material. When voltage is applied, the
	amount of light able to pass through the glass plates is altered so
	that messages may be ªwrittenº on the display.

GL-6 November 1996 3910-A2-GN32-30