speed buffering
interface speed
connection speed
flow controlRTS/CTS hardware control by special wires
XON/XOFF software control through special characters (Ctrl-Q/Ctrl-S)
ASL Automatic Speed Leveling during retraining
error controlMNP 1, 2, 3, 4 Microcom Networking Protocol
(de facto standard)
V.42 Link Access Protocol for Modems (LAPM)
error-control fallbackV.42 --> MNP4 --> MNP3 --> MNP2 --> MNP1 --> none
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