Panasonic KX-TDA100 installation manual Calculation Example KX-TDA200, Equipment Type, Load Figure

1.4.3 System Capacity

Calculation Example (KX-TDA200)

Equipment Type		Load Figure
KX-DT300/KX-T7600 series DPT	48 units	48
Other DPT	2 units	8
SLC16	1 card	16
MSLC16	1 card	16
VPS	8 ports	8
Total		96

The total load figure is 96. As this is between 64 and 128, you should install the PSU-M. But if you expect expansion in the future, it may be better to install the PSU-L. There is no harm in installing a PSU that is larger than is required for the current configuration.

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Installation Manual