Cisco Systems - Cisco VPN 5002 Concentrator Hardware Guide (2001)

Cisco Systems - Cisco 7100 Series VPN Router Configuration Guide (2000)

Cisco Systems - Cisco 7100 Series VPN Router Quick Start Guide (2000)

Cisco Systems - Cisco VPN 5008 Concentrator Hardware Guide (2001)

Cisco Systems - PA-8T-V.35 Synchronous Serial Port Adapter Installation (2000)

Cisco Systems - Cisco 7100 Series VPN Configuration Guide (2001)

Cisco Systems - Cisco 1700 Series Router Software Configuration Guide (2001)

Nortel Networks - Reference For The Contivity VPN Switch (2000)