Terminology
ASL	Adaptive Speed Leveling
Asynchronous	length of time between transmitted characters is not uniform. Recır must be signalled with start/stop bits
Baud rate	Number of discrete signal events/sec. Usually taken to mean bit rate
Bit Rate (BPS)	number of bits/sec
CCITT	Intıl Org which defines telecom stds
Duplex	comm channel capable of carrying signals in both directions (Full means simultaneously, Half means alternating)
Echo Cancelling	technique to distinguish between actual signals & echoes (esp necess on std phone lines in high speed data)
Error Control	various techniques to check the reliability of characters (parity) or blocks of data
Handshaking	signalling between modems to establish a carrier and negotiate for speed, error control, etc.
Local Echo	Modem feature permitting sending copies of keyboard commands and transmitted data to the screen
MNP	Microcom Networking Protocol (ensures error free transmission)
v.21	CCITT standard for 300 bps
v.22	CCITT standard for 1200 bps
v.22bis	CCITT standard for 2400 bps with fallback to 1200
v.23	CCITT standard for 1200 bps receive & 7500 send (used by French MiniTel)
v.32	CCITT standard for 9600 bps both ways (requires echo cancelling)
v.32bis	CCITT standard for up to 14,400 bps (14.4kbps) (2 wire full duplex
v.42	CCITT standard for error correction. Much like MNP 24, which it includes
v.42bis	CCITT standard for error correction. Much like MNP 5 but about 35% better compression (thus higher throughput)