The PIX 535 and PIX 535 DC can be upgraded with additional system memory. 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.
If the unit is rack-mounted, remove network wires and any cords connecting to the PIX Firewall unit. Ensure that the unit is unplugged from its power source. Step 2 Unpack the items in the memory upgrade kit. Remove the component tray from the PIX Firewall unit. Remove all screws holding the assembly in place.