US Robotics COURIER User Manual page 193

COURIER HIGH SPEED MODEMS
When the modem is online to another system, the local echo is
invoked through the A TFO command. This command causes the
modem to display the data it transmits to the remote system.
Ml/MIC
MNP
Mode Indicate/Mode Indicate Common, also called Forced or
Manual Originate. Provided for installations where other
equipment, rather than the modem, does the dialing. In such
installations, the modem operates in Dumb mode (no Auto Dial
capability), yet must go off hook in Originate mode to connect
with answering modems. See Ml/MIC Closure in Chapter 2.
Microcom Networking Protocol, an asynchronous error control
protocol developed by Microcom, Inc. and now in the public
domain. The protocol ensures error-free transmission through
error detection (CRC) and retransmission of errored frames.
USRobotics modems use MNP Levels 1-4 and Level 5 data com-
pression. MNP Levels 1-4 have been incorporated into CCITT
Recommendation V.42. Compare HST.
Modem
A device that transmits/receives computer data through a com-
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munications channel such as radio or telephone lines. The -
Courier is a telephone channel modem that modulates, or trans-
forms, digital signals from a computer into the analog form that
can be carried successfully on a phone line. It also demodulates -
signals received from the phone line back to digital signals
before passing them to the receiving computer.
Nonvolatile Memory (NVRAM)
User-programmable random access memory whose data is
retained when modem power is turned off. Used in Courier
modems to store a user-defined default configuration loaded
into random access memory (RAM) at power on.
OFF/ON Hook
Modem operations which are the equivalent of manually lifting
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a phone receiver (taking it off hook) and replacing it (going on -
hook).
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G-8 Glossary
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