ADSL modems, Broadband technology, QAM, TCM, DAMQAM, DPSK, Modulation techniques

AT command list The PC Card modem will respond to the commands detailed below. Parameters applicable to each command are listed with the command description

CCITT - ISP glossary's definition and links Abbreviation of Comité Consultatif International Téléphonique et Télégraphique, an organization that sets international communications standards. CCITT, now known as ITU (the parent organization) has defined many important standards for data communications, including the following

Communications Codes, Controls, Hardware Handshaking Communications Codes, Controls, Hardware Handshaking, ASCII vs EBCDIC vs UNICODE, ASCII 7-bit character set / ASCII extended characters, non-printing control characters (0-31, 127), Asynchronous Communications Adapter, UART (8250, 16450, 16550), parallel-to-serial / serial-to-parallel converter, bps rate / word size / parity / stop bits

Communications Codes, Controls, Hardware Handshaking

DPSK mode describes the sixteen-tone differential phase-shift keying (DPSK) mode

FAX Modem Transmission Modulation Systems Constellation Points, QAM, TCM, DAMQAM, DPSK, Modulation techniques

FAQ dated but still useful

How Analog Modems Work How Analog Modems Work

How Modems Work How Modems Work, Analog communications, Modems, Modulation-demodulation methods, Baud rate Vs. Bits Per Second, Digital serial communications, Simplex, half-duplex and full-duplex, Synchronous serial transmission, Asynchronous serial transmission, The RS-232C standard, Mechanical and electrical specs, Control lines, Handshaking, Null modem, pdf file

Introduction to modems a modem converts digital signals from your computer into audible tones which can be transmitted over ordinary analog phone lines, part of Internet Basics 101

Modem driver list manufactures and drivers, adsl modem, 56k modem

Modem AT command set 2 a complete summary and explanation of the AT command set for Hayes compatible dial-up modems

Modem Block Diagram V90 Modem Block Diagram, pdf file

Modem Block Diagram V92 Modem Block Diagram, pdf file

Modem: list of modem command sets

Modems com technical reference infobase, a tip

Modem-HOWTO Serial Port and Modem Basics, AT Commands, dialing, ISDN modem, ...

Modem operation Operating states, Switching to command mode, Data format, Entering AT commands, Errors in command lines, A/ Repeat last command, V.42 and V.42bis, MNP 2-5 and MNP 10, Selecting the error correction method, Selecting the data compression method, Error correction and data compression messages, Error correction & data compression

Modemsite.com modem information, troubleshooting, modem drivers

Modem Reference Index Data/FAX Modem Transmission Modulation Systems, Data/FAX Modem Transmission Reliability and Compression Protocols, ITU/CCITT/EIA/Bell RS-232 Connector Pin Assignments

Modems a modem converts digital signals from your computer into audible tones which can be transmitted over ordinary analog phone lines. This process is called modulation. On the receiving end, a modem demodulates the analog signals arriving over the phone line into electrical signals which are then fed to the computer. MOdulation and DEModulation accurately describe what modems do

Modems pdf file

Modems Range, Short Haul, Voice Grade (VG), Wideband, Line Type, Dial-up, Leased, Private, Operation Mode, Half Duplex, Full Duplex, Simplex, Synchronization, Asynchronous, Synchronous, Modulation, AM, FM/FSK, PM, TCM

Modemsite.com modem drivers, modem chipset, V.92, forum, troubleshooting

Modem Speeds, Baud Rate, Modulation Method Modem Speeds, Baud Rate, Modulation Method, Amplitude Modulation, Frequency Modulation, Phase Modulation

MODEMS FOR THE PSTN AND INTERFACE STANDARDS pdf file

Modem technology the modem is a peripheral device for computers which allows 2 computers to communicate over standard phone lines

Modulation and demodulation modems for datatransmission over analog lines, pdf file

Modulation modems Half Duplex, simplex, Full Duplex, modulation, en Français, pdf file

Nullmodem.Com Connector pinout and cable reference, 10Base-T crossover, serial, parallel, USB, serial port, connector pinout, DB-25, DB25, DB-9, DB9, RJ-45, RJ45, ethernet, null-modem cable

Practical guide to analog modems Data Communication Equipment and Data Terminal Equipment, Hardware Flow control and other Out of Band signaling, Carrier Detect, CD, Ready To Send, Clear to Send, CTS, Ring indicator, RI, RTS, DCE serial Interface and the DTE Serial Interface, Hardware Flow Control Commands, Baud vs. Bits Per Second, Error Correction, Line Equalization, Problems in Handshaking, Retraining, Fall Forward and Fall Back

Quadrature Amplitude Modulation Quadrature Amplitude Modulation, QAM, combination of amplitude modulation and phase shift keying

Horizontaal

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