USRobotics V.34 user manual Mi/Mic

COURIER HIGH SPEED MODEMS

Local Echo

A modem feature that enables the modem to send copies of key- board commands and transmitted data to the screen. When the modem is in Command mode (not online to another system) the local echo is invoked through the ATE1 command. The com- mand causes the modem to display your typed commands. When the modem is online to another system, the local echo is invoked through the ATF0 command. This command causes the modem to display the data it transmits to the remote system.

MI/MIC

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 MI/MIC Closure in Appendix G.

MNP

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. U.S. Robotics modems use MNP Levels 1−4 and Level 5 data compression. MNP Levels 1−4 have been incorporated into ITU-T Recommendation V.42. Compare HST.

Modem

A device that transmits/receives computer data through a com- 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.

Glossary J-9