System Construction; Basic System - Panasonic KX-TD500 Installation Manual

System Outline

1.2 System Construction

1.2.1 Basic System

Basic System consists of one Shelf called Basic Shelf and it can be equipped with up to 192
lines (including Extensions and CO lines).
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Basic Shelf
A Basic Shelf is always required. It contains its own power supply and 14 mounting spaces
called "Slots." The Basic Slot 1 (BS1) is provided for installing the CPU card. The TSW card
is already installed in the Basic Slot 2 (BS2) at the factory. The remaining 12 slots provide
mounting space for various cards that can be used. Any optional service card can be mounted
in any one of these 12 slots. So these slots are called "Free Slot (FS)."
Construction of Basic Shelf
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Installation Manual