AT&T 3.0 manual Upgrading the System

Upgrading the System

To upgrade the control unit, follow the steps below:

1Remove the control unit housing.

See “Removing the Control Unit Housing,” next in this chapter.

2If the current system programming is to be used in the upgraded system, back up system programming.

See “Completing the Upgrade,” later in this chapter, for details.

3Power down the system.

See “Powering Down the System, ” later in this chapter, for instructions.

Upgrading the System 9-1