How Does a Modem Work?

• Modem Overview
• Analog vs. Digital
• Data Compression
• Error Correction
• Flow Control
• UARTs and Data Buffering

Standards and Protocols

• Bell/CCITT/ITU-T Standards
• Data Transfer Protocols
• Fax Standards and Protocols
• Modulation Protocols
• TCP/IP, SLIP, and PPP

Communications and Software issues

• AT Command Sets
• COM Port Settings
• Data Communications Application Software
• IRQ Settings
• S Registers
• Synchronous vs. Asynchronous Data Transfer

LINKS

LT Win Modem

Modem Help.com