Power Supply Unit Load Requirements; Unit Load Calculation Rules - AT&T MERLIN LEGEND Release 2.0 Pocket Reference Manual

Power Supply Unit Load Requirements

Unit Load Calculation Rules

Installed
Mode Modules
Hybrid/PBX,
Modified Key,
or
Behind Switch
4 or fewer†
Square Key
o r
Behind Switch
* The 391A1 power supply unit generally supports 6 modules of
any type in Hybrid/PBX mode. However, if all 6 carrier slots
meet the following conditions, the unit load 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
telephones are installed.
t The 391A1 power supply unit generally supports 4 modules
Calculation
Not required
6 *
Not required
49