Panasonic KX-TD500 Installation Manual page 18

1.2 System Construction
System Expansion
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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System Outline