Panasonic KX-TDA600 Installation Manual page 94

2.2.7 Installation of 4-shelf System (Side-by-side Type)
Installing Expansion Shelves 2 and 3
Repeat the procedure in "Installing the Basic Shelf and Expansion Shelf 1" for Expansion Shelves 2 and 3.
Expansion Shelves 2 and 3 must be connected to the Basic Shelf using Bus Cables. Therefore, make sure
that Expansion Shelves 2 and 3 are installed so that the Bus Cables can reach the Basic Shelf.
Basic Shelf and Expansion Shelf 1
Shelf installation is complete. Next, it is necessary to connect the shelves.
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Expansion Shelves 2 and 3