Panasonic KX-TD500 System Reference Manual page 59

B. Installation of Shelf
This subsection describes the installation of the shelf, with information on expanding the
capacity of an existing system.
Building Block System provides the enlargement of system's ability by installing the
optional Expansion Shelf.
Up to two Expansion Shelves can be installed to the system.
Each expansion shelf can be equipped with up to 224 lines (including Extensions and
CO lines).
The system can consist of one, two or three shelves (Basic, Expansion 1 and
Expansion 2).
Each shelf contains its own power supply.
1.00 Basic Shelf
Basic Shelf is always required and it can be equipped with up to 192 lines (including
Extension and CO lines).
The basic shelf includes top cover and base shelf.
The following figure shows a basic system composed of a basic shelf only.
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