All modem applications must use hardware flow control (RTS/CTS)
6 Modem Control Signals
RTS (Ready to receive)
TT (Terminal Timing)
DSR - Modem is ON
DCD - connected
CTS (Clear to Send)
RI (Ring Indication)
ST (Send Timing)
7 Asynchronous modem glossary CCITT InternationalTelegraph and Telephone Consultative Commitee (now ITU-T) ITU-T Internatio nal 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 --gt V.34 --gt V.32bis --gt V.32 --gt V.22bis --gt V.22 8 Asynchronous 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 Au tomatic Speed Leveling during retraining err or control MNP 1 2 3 4 Microcom Networking Protocol (de facto standard) V.42 Link Access Protocol for Modems (LAPM) error-cont rol fallback V.42 --gt MNP4 --gt MNP3 --gt MNP2 --gt MNP1 --gt none 9 Asynchronous modem glossary data compression MNP3 4 protocol optimization (108-120) MNP5 V42bis true compression (up to 400 depends on data) compression fallback V.42bis --gt MNP5 --gt none DTE Data Terminal Equipment (computer) DCE Data Communication Equipment (modem) DTE-DCE signaling DTR Data Terminal Ready set by DTE DSR Data Set Ready set by modem RTS CTS Ready To Send Clear To Send used to handshake on sped buffering CD Carrier Detect set by modem (remote modem is connected)
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