AT&T MERLIN LEGEND System Reference Manual page 620

Unit Load Calculation Work Sheet
1. Number of modules in carrier (excluding power supply module and
processor module)
If fewer than 5, auxiliary power is not required.
If 5 or 6, continue to step 2.
2. Key or Behind Switch mode only
Indicate configuration of lines; then go to step 5
3. Hybrid/PBX mode only:
Do all modules in the carrier have MLX and/or analog
multiline station jacks?
If no, auxiliary power is not required.
If yes, continue to step 4.
4. Hybrid/PBX mode only:
Calculate the total number of MLX and analog multiline telephones:
Number of MLX-20L telephones connected to modules in the carrier
Number of MLX28D telephones connected to modules in the carrier
Number of 34-button analog multiline telephones connected to
modules in the carrier
Total of MLX-20L, MLX-28D, and 34-button analog multiline telephones
If total is less than 45, auxiliary power is not required.
If total is 45 or more, continue to step 5.
H-2 Unit Load Calculation Work Sheet
Square
Modified
Yes
No