Installing The Basic Carrier - AT&T MERLIN LEGEND Release 3.1 Installation Manual

Installing the Basic Carrier

Unit Loads for Key or Behind Switch Mode
In a Key or Behind Switch system with four or fewer modules, no calculation is
needed. The older power supplies (models 391A1 or 391A2) generally
supports four modules of any type. With more than four modules, a newer
power suppy (model 391A3) may be needed.
Installing the Basic Carrier
Continue with this procedure only if you have met all of the requirements
discussed earlier in this chapter.
NOTE:
When you mount the basic carrier onto the backboard, leave 29 in. (73.66 cm)
of backboard to the right. This allows you to easily install and remove the
control unit cover, and also allows enough room for system expansion to the
right for the total length of up to three carriers.
Installing the Control Unit
2–17