Paradyne 3810 manual Hdlc

COMSPHERE 3800 Series Modems

Group III	A fax standard that specifies a rate of transmission of about one page per minute.
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 ISO.
hidden choice indicator	A symbol appearing in the upper right-hand corner of the LCD, indicating that more
	selections 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	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.
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 ``writtenº on the display.
leased line	A private line connection exclusively for the user. No dialing is necessary.
LED	Light-Emitting Diode. A light or status indicator on the DCP that glows in response to
	the presence of a certain condition (e.g., Alrm).
local analog loopback	The modem's transmit VF signal is looped to its receiver.
long space disconnect	A disconnect can occur if the modem receives an extended space from a remote modem;
	for example, when a remote modem is commanded to disconnect, it transmits a
	continuous space to the modem before disconnecting.
loopback test	Any test that verifies a device's integrity by connecting the device's output of one
	direction to the device's input of the other direction, then checking the received signal for
	errors.
LSD	Line Signal Detect. A signal between the DTE and modem indicating energy exists on
	the transmission circuit.
menu tree	The structure containing the 3800 Series menu hierarchy starting at a Top-Level menu
	and extending down to various modem functions.
MNP	This protocol (Microcom Networking Protocol) detects and corrects data errors caused
	by telephone line noise and signal distortion. MNP5 includes data compression.

Glossary-6 November 1996 3810-A2-GB30-20