USRobotics x2/56K, 33600 user manual Fallback, Fax mode, Flow control, Local Echo

Fallback

(Rate adjustment). A function that lets rapid modems with error correction control the line quality and fall back to a lower speed if it becomes degraded. Modems go back to a higher speed if the line quality improves.

Fax mode

Mode in which the fax/modem can transmit and receive facsimiles.

Flow control

A method that compensates for differences in the data flow coming in to and going out from a modem or other device. See RTS/CTS and XON/XOFF

IRQ

Interrupt Request. In a computer, IRQs are used to temporarily interrupt current processing when an event requires immediate attention, such as for example, the arrival of data at the serial port.

LAPM

Link Access Procedure for Modems. Error correction protocol incorporated in the ITU-T V.42 recommendation. Just like the MNP protocols, LAPM uses cyclical redundancy check (CRC) and automatic re-transmission of data (ARQ) to guarantee data reliability.

Local Echo

A function of the modem used to display keyboard command and transmitted data on the screen. This function is provided with most communications software.

MNP

Microcom Networking Protocol. Error correction protocol developed by Microcom, Inc. and now in the public domain. MNP protocol guarantees error-free transmissions using error detection (CRC) and re-transmission of incorrect data frames.

64 Sportster Winmodem 33600 & x2/56K - User's manual