Power Supply Unit Load Requirements; Unit Load Calculation Rules - AT&T MERLIN LEGEND Pocket Reference

Power Supply Unit Load Requirements

Unit Load Calculation Rules

Installed
Mode Modules
Hybrid/ 6*
PBX
and
Modified
Key/
Behind
Switch
4 or fewer †
Square
Key/
and
Behind
Switch
*
The 391A1 power supply unit generally supports 6 modules of
any type in Hybrid/PBX mode. However, if all 6 carrier slots
have the following conditions, the unit load (UL) total may
exceed 54 and auxiliary power may be required.
Only MLX or analog multiline station modules are installed.
More than 45 MLX-20L or 34-button analog multiline stations
are installed.
† The 391A1 power supply unit generally supports 4 modules of
any type in Square Key mode.
Calculation
Not required
Not required
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