Page 292 of 362 Replacing equipment553-3001-520 Standard 16.00 April 200016 Perform the KNEW command:17 Reboot the system at a time that will minimize service impact.The new keycode will not take effect until the system reboots.Replacing the Security Device on an Option 51C system1 To access the Core during the replacement procedure, connect a terminalto the J25 port on the I/O panel in the Core Module or Core/NetworkModule. To communicate with the processor, you must use the followingsettings on the terminal:9600 baud, 7 data, space parity, 1 stop bit, full duplex, XOFF2 Set the ENB/DIS switch on the IODU/C with the faulty Security Deviceto DIS.3 Unhook the locking devices and remove the IODU/C.4 Remove the round 1/2” diameter Security Device from the black roundSecurity Device holder on the top right corner of the IODU/C card.5 Locate the round 1/2” diameter IODU/C replacement Security Device.6 Make sure the 8-digit code on the Keycode diskette matches the 8-digitcode on the replacement Security Device.STAT to see the status of the IODU/Cs**** to exit LD 137LD 143 to load the programKNEW HD to copy the keycode to the other Core**** to exit the programWARNINGPerforming this procedure in a nonredundant system, such as 51C, willdisrupt system operation. If possible, schedule the replacement at thelowest traffic time.
