Upgrading The Control Unit - AT&T MERLIN LEGEND Release 3.1 Installation Manual

Upgrading the Control Unit

Upgrading the Control Unit
1 Do not remove any of the existing carriers.
2 Refer to the Control Unit Diagram on the flip side of System Planning
Form 1.
If you are installing an expansion carrier, remove the rightmost module from
the control unit and put it aside. See Figure 9–3.
!
CAUTION:
Before removing any cords from the module, make sure they are
labeled first for easier replacement.
3 Install any expansion carriers.
See "Installing Expansion Carriers" in Chapter 2.
4 Install or replace any modules. If you are upgrading from Release 3.0 or
later, go to Step 6.
See "Installing the Modules" in Chapter 2.
NOTE:
If you are replacing an 012 module with an 016 module, you will need to
perform a Board Renumber after completing the upgrade. See System
Programming for more information about Board Renumber.
Upgrading the System
9–7