Panasonic KX-TD500 System Reference Manual page 61

2.00 Expansion to 2-Shelf System
The KX-TD500 System can be expanded to 2-Shelf System by installing the Expansion
Shelf 1 on the Basic Shelf.
The 2-Shelf system can be equipped with up to 416 lines (including extensions and CO
lines).
The following figure shows a 2-Shelf System composed of a basic shelf and an expansion
shelf.
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