Panasonic KX-TD500 Installation Manual page 19

1.2 System Construction
System Expansion
1-6 System Outline
The KX-TD500 system's capacity can be expanded by installing
up to two Expansion Shelves on the Basic Shelf.
Fully expanded system (Basic Shelf + Expansion Shelf 1 +
Expansion Shelf 2) is called "3-Shelf System."
3-Shelf System
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