Paradyne Comsphere 3920Plus Installation And Operation Manual page 272

COMSPHERE 392xPlus Modems
half-duplex
handshaking
HDLC
host
Hz
idle
JM8
keypad
LCD
leased line
LED
local analog loopback
long space disconnect
loopback test
menu tree
mixed inbound rates
MNP
modem
modulation
Glossary-6
Two-way data communications allowed in only one direction at a time.
The exchange of predetermined codes and signals (tones) to establish a connection
between two modems.
High-Level Data Link Control. A communications protocol defined by the International
Standards Organization (ISO).
A computer attached to a network that shares its information and devices with the rest of
the network.
A unit of frequency (Hertz) that equals one cycle per second.
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.
A jack used for leased-line networks. Pins 1 and 2 are the transmit pair and Pins 7 and 8
are the receive pair.
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.
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 "written" on the display.
A private telephone line connection exclusively for the user. No dialing is necessary.
Light Emitting Diode. A light or status indicator on the DCP that glows in response to
the presence of a certain condition (e.g., an alarm).
The modem's transmit VF signal is looped to its receiver.
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 local modem before disconnecting.
Any test that verifies a device's integrity by connecting the device's output to the
device's input, then checking the received signal for errors.
The structure containing the menu hierarchy starting at a Top-Level menu and extending
down to various modem functions.
In a multipoint network, several different data rates from tributary modems' transmitters
communicating with one control modem.
This protocol (Microcom Networking Protocol) detects and corrects data errors caused
by telephone line noise and signal distortion. MNP5 includes data compression.
(Modulator/DEModulator). A device that transforms signals from digital to analog form
and vice versa.
The process of varying some characteristics (usually amplitude, frequency, and/or phase)
of a carrier wave to form data transmissions.
April 1995 3920-A2-GN31-10