AT&T 3.0 manual Control Unit Problems, Backing Up System Programming

Control Unit Problems

4

The next step after resolving problems with telephones, adjuncts, and related wiring, is to troubleshoot the control unit. Troubleshoot the control unit components in the following order:

■Power supply

■Processor

■Line/trunk and extension modules (hereafter referred to as modulles)

■Carrier

WARNING:

Beware of hazardous voltages. Only qualified technicians should attempt to service the control unit. Follow all procedures care fully.

Backing Up System Programming

Before performing any procedure that requires powering down the system, save system programming in one of the following ways:

■Save the system programming to a floppy disk. See System Programming and Maintenance (SPM) for detailed instructions.

Control Unit Problems 4-1