All models of PIX Firewalls can be upgraded with additional system memory. Use Table 6-1 to determine the memory options for PIX Firewall models. Observe the following warnings, cautions and notes when installing additional PIX Firewall system memory. Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position.
Caution Always remove old memory before installing new memory.
After installing additional memory in a PIX 520, do not remove the memory strips after you install them and have powered on the unit, or the PIX Firewall unit will become inoperable. Caution If you remove a PIX Firewall chassis cover, always reinstall the cover. Running a PIX Firewall without the cover may cause overheating and damage to electrical components. If the unit is rack-mounted, remove network wires and any cords connecting to the firewall unit. Then remove the unit from the rack and place on a stable working surface.