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