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14 Troubleshooting and Fault Clearing Procedures
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Rebooting the System
Rebooting the system is a last-resort method of remedying an error condition.
There are three ways to reboot a DNC:
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Using Software Reboot
If you are the superuser, you can reboot the system by using the software
reboot feature. (Only the superuser can access the Utilities Services - Main
Menu, as required by this procedure.) Take the following steps:
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Practice 450-1011-501
If the program resource units (PRUs) in an SRU repeatedly have a
'Faulty' status, power the system down and replace the SRU.
After replacing an SRU, power the system up and reboot the device
using the 'Courtesy Down' and 'Put into Service' functions.
If you cannot access the system from the administrator's terminal,
reinitialize the system using the backup tape (if available), or do a
complete system rebuild.
If the system reinitialization does not complete successfully, power the
system down, replace the Primary Processor SRU, power the system up
again, and attempt to reload the system from the backup tape (if
available), or do a complete system rebuild.
If the system fails to reboot successfully, power the system down,
replace the Mass Storage SRU, format the disk, and again attempt to
reload or rebuild the system.
If you continue to have problems, contact Northern Telecom's customer
service center.
using the software reboot feature
pressing the Reset button on the Primary Processor SRU (if the system
is equipped with a 68020 XP primary processor)
powering down and then powering up again.
Sign on as the superuser.
The main menu appears.
Select the System Administrative Services option and press ENTER.
The System Administrative Services - Main Menu appears.
Select the Utilities option and press ENTER.
The Utilities Services - Main Menu appears.
Select the Helix Command Interpreter option and press ENTER.
The system prompt appears. (It is usually '>'.)
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