AT&T feature module 2 Auxiliary Power Unit, Module, Much auxiliary power the system needs

Auxiliary Power Unit

DESCRIPTION	You must add an auxiliary power unit (Figure 2-14) to any control unit carrier
	if the total number of voice terminals and voice terminal accessories (including
	hands-free units and headset adapters) is greater than the carrier’s capacity.
	Each carrier of your system control unit supports up to 45 units, and each
	auxiliary power unit adds 20 unit loads to your system. (For information on
	units and unit loads, see the MERLIN II System Installation and Administration
	Manual.)
	FIGURE 2-14 The auxiliary power unit.

CONSIDERATIONS	The Auxiliary Power Unit can be mounted on the wall beside the control unit.
	The power unit and the control unit are connected with an auxiliary power
	cord. The cord can be plugged into the auxiliary power jack on the Power
	Module.
HOW TO USE	Be sure that your system administrator knows what accessory equipment you
	have attached to your voice terminal so that the administrator knows how
	much auxiliary power the system needs.
	Instructions for installing and using the auxiliary power unit are provided
	with the unit.

2-170Accessory Equipment