
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 |
| 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 |
| 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 |
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. |
November 1996 |