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18 Getting Started
• Be sure to comply with all applicable laws, regulations, and guidelines.
• Proper earthing is very important to protect the PBX from external noise and to reduce the risk
of electrocution in the event of a lightning strike.
• The AC cable's earthing pin may not be enough to protect the PBX from external noise and
lightning strikes. A permanent connection must be made between earth and the earth terminal
of the main unit.