- MODEM Protocols
- XMODEM Overview, XMODEM/YMODEM Reference, ZMODEM Protocol
- ISDN
- ISDN FAQ
- OSI
- Understanding OSI
- Serial I/O
- RS-232 Guide
- Videoconferencing / Data Conferencing
- T.120 Presentation, T.120 Primer
- IP Protocols
- TCP Evaluation
- SONET
- SONET 101
- Application/Desktop Sharing
- VNC's RFB Protocol, T.120 (T.128)
- VoIP
- VoIP Info Site (covers H.323, SIP, H.248, and MGCP)