2.2 Installation of Shelf
Installation 2-7
This subsection describes the installation of the shelf, with infor-
mation 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.
2.2.1 Basic Shelf
Basic Shelf is always required and it can be equipped with up to
192 lines (including Extensions 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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