COMSPHERE 392xPlus Modems

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.

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).

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.

MSD

Modem Sharing Device. Allows from 2 to 4 physical ports to share a communication

 

channel.

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.

Multiport mode

Multiport mode operates only in multiport modems. It is determined by your modem

 

model and the selected MUX mode configuration option. Multiport mode is in effect

 

when the MUX mode configuration option is set to TDM/MSD or DTE_Bridge. It

 

supports from one to four ports depending on how the modem is further configured.

Glossary-6

November 1996

3920-A2-GN31-30

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Paradyne 392xPLUS Idle, Keypad, Leased line, Local analog loopback, Long space disconnect, Loopback test, Menu tree, Modem