Async. modem glossary
CCITT InternationalTelegraph and Telephone Consultative
Commitee (now ITU-T)
ITU-T International Telecommuncations Union,
Telecommunication Standardization Sector (former
CCITT)
V.nn ITU-T (CCITT) recommended standards
modulation standards
Bell 103, V.21 110, 150, 300 bps
Bell 212A, V.22 1200 bps
V.22bis 2400 bps
V.32 2400, 4800, 9600 bps
V.32bis 7200, 9600, 12000, 14400 bps
V.Fast preliminary V.34
V.34 28800, ..., 14400 bps
V.34bis 33600, ..., 14400 bps
V.90 56.700 bps
modulation fallback
V.90 --> V.34 --> V.32bis --> V.32 -->
V.22bis --> V.22