External Links
What is a PVDM (Cisco High-Density Packet Voice Digital Signal Processor Modules)
Installing and Upgrading Memory in Cisco 1700 Series Routers
Upgrading System Memory, Internal Flash, and Boot ROM in Cisco 2600 Series Routers
Power over Ethernet (POE) Pinout for Cisco IP Phones and Switches
Packet Tracer 6.0 - Router devices and WIC modules