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Glossary
GL-73910-A2-GN32-30 November 1996
leased line
A private telephone 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., an
alarm).
Link The physical connection between one location and another used for
data transmission. See Channel.
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
local modem before disconnecting.
loopback test 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.
menu tree The structure containing the menu hierarchy starting at a
Top-Level menu and extending down to various modem functions.
mixed inbound rates In a multipoint network, several different data rates from tributary
modems’ transmitters communicating with one control modem.
MNP This protocol (Microcom Networking Protocol) detects and
corrects data errors caused by telephone line noise and signal
distortion. MNP5 includes data compression.
modem (Modulator/DEModulator). A device that transforms signals from
digital to analog form and vice versa.
modulation The process of varying some characteristics (usually amplitude,
frequency, and/or phase) of a carrier wave to form data
transmissions.
multiplexer (mux)
A device that enables the simultaneous transmission of multiple
independent data streams into a single high-speed data stream.
multipoint line A circuit connecting one control modem with one or more
tributary modems.
network A communications circuit.
network management
address
The customer
-assigned diagnostic address of a modem.
NIM Network Interface Module. The interface provided, up to two per
carrier, for the public switched telephone network (PSTN).
non-linear distortion
VF line distortion which is usually associated with pulse-code
modulation (PCM) compandor noise on the phone line.