Our technical writers write documentation about broadband networks (wired, wireless, optical), protocols (Internet TCP/IP, Ethernet, delay-tolerant, OSI layers), interconnects, and programming. This SRI technical report describes a port expander for an interface message processor (IMP) used on the U.S. Defense Advanced Research Project Administration (DARPA) ARPANET, the predecessor to today's Internet.

• Length: 54 pages
• Audience: Network managers and installers
• Service Performed: Complete original manuscript
• Online Version: The APRANET IMP Port Expander (200Kbyte PDF)