Panasonic KX-TD500 System Reference Manual page 69

3.00 Expansion to 3-Shelf System
The KX-TD500 System can be expanded to 3-Shelf System by installing the Expansion
Shelf 2 on the 2-Shelf System.
Up to 512 lines (including extensions and CO lines) can be equipped with 3-Shelf
System.
Note :
Before stacking the Expansion Shelf 2 on the 2-Shelf System, remove the front panel
and side panels from Expansion Shelf 2 following the procedures described in Section
2-B-2.00 "Expansion to 2-Shelf System".
If a part of the top cover is not removed, it is necessary to remove the part of the top
cover just like the 2-Shelf System. Refer to Section 2-B-2.04 "Removing a Part of the
Top Cover".
The figure below shows a 3-Shelf System composed of a basic shelf and two expansion
shelves.
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2-B-11