Async. modem glossary

speed buffering
interface speed

connection speed
flow control
RTS/CTS hardware control by special wires

XON/XOFF software control through special characters (Ctrl-Q/Ctrl-S)
ASL Automatic Speed Leveling during retraining
error control
MNP 1, 2, 3, 4 Microcom Networking Protocol

(de facto standard)
V.42 Link Access Protocol for Modems (LAPM)
error-control fallback
V.42 --> MNP4 --> MNP3 --> MNP2 --> MNP1 --> none
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