NEC Aspila EX Hardware Manual page 39

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The ground lug descriptions are as follows:
• SG (Signal Ground)
The plus side of the supplied voltage to single line telephones in the PBX requires a connection to
the earth. The SG ground lug should be connected to the verified Earth point. The SG lugs on
both cabinets must be connected with a seperate cable to Earth ground.
• PBXG (CO/PBX Ground Start Trunk Ground)
The PBXG line on the backplane is connected to this ground lug. This ground lug should be con-
nected to the earth when using analogue DID, E&M or ground start trunk cards in the system.
The PBXG lugs on both cabinets can share a single cable to Earth ground
• ETH (Earth Ground)
This ground lug is used for lightning protection. It should always be connected to the earth. The
ETH lugs on both cabinets must be connected with a seperate cable to Earth ground.
• FG (Frame Ground)
This ground lug is connected to the earth wire of the AC power supply cable and also connected
to the metal frame of the main equipment. This ground lug must be connected to the verified
Earth ground point if the earth cable of the AC power supply cable is not connected to Earth
ground.
Aspila EX Hardware Manual
Chuyên phân phối tổng đài NEC
Section 1: Installing the Cabinets
Section 1: Installing the Cabinets
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