Digicom 3911 Download, Downstream device, Edit area, EIA RS-232, Error control, Escape sequence

COMSPHERE 3900 Series Modems

download	A process that transfers device firmware and software from a locally-attached PC to a device, or
	allows the duplication of firmware and software from a local device to a remote device.
downstream device	A device that is connected farther from the host computer.
DTE	Data Terminal Equipment. The equipment, such as a computer or terminal, that provides data in
	the form of digital signals for transmission.
edit area	A temporary work area used to view and change configuration options from the DCP without
	impacting modem operation. The edit area can be loaded from one of five configuration option
	areas: Active (Operating), Active (Saved), Customer 1, Customer 2, or Factory.
EIA	Electronic Industries Association. This organization provides standards for the data
	communications industry to ensure uniformity of interface between DTEs and DCEs.
EIA RS-232	An Electronic Industries Association standard defining the 25-position interface between data
	terminal equipment and data communications equipment.
error control	An algorithm used to detect and correct data transmission errors.
escape sequence	Default setting is +++. This sequence lets you switch your modem from Data mode to Command
	mode.
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 that 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. The Board of Commissioners that regulates all electrical
	communications that originate in the United States.
FEC	Forward Error Correction. A method of error control for data transmission where the receiving
	device can detect and correct a character or block of code containing a predetermined number
	of erroneous bits.
FEP	Front-End Processor. A communications computer associated with a host computer that
	manages the lines and routing of data through the network.
full-duplex	The capability to transmit in two directions simultaneously.
function key	One of three keys on the DCP that allows you to select or scroll to an LCD entry. Function keys
	are labeled F1, F2, and F3.
half duplex	The capability to transmit in two directions, but not simultaneously.
handshaking	The exchange of predetermined codes and signals (tones) to establish a connection between
	two modems. During handshaking the modems determine the modulation, rate, and type of error
	control they will use.
HDLC	High-Level Data Link Control. A communications protocol defined by the International Standards
	Organization (ISO).
hidden choice	A symbol appearing in the upper right-hand corner of the LCD, indicating that more selections
indicator	are available than what appears on the LCD.
host	A computer attached to a network that shares its information and devices with the rest of the
	network.
Hz	Hertz. A unit of frequency that equals one cycle per second.
idle state	A state in which the modem’s configuration options can be modified or commands can be issued
	to the modem using AT commands.

Glossary-4 September 1998 3910-A2-GN32-40