3Com 3C13751 Getting Started Manual

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3Com 3C13751 Getting Started Manual Manual pdf 27 page image

Power Cords, Grounds and Cables 27Use a PGND wire to connect the screw to the earth ground, and thegrounding resistance should not be greater than 5-ohm. Likewise, if therouter is installed in a 19-inch standard rack, this rack is required to begrounded too.CAUTION: When the router is in normal operation, it is required to bewell grounded. Otherwise, the router cannot reliably avoid lightning,which may damage the router itself and even the peer device.Power Cord The user is provided with two types of the Router 5000: AC-powered andDC-powered. Except for the input power, these two types have exactlythe same features and functions.Power input andPGNDAC Power Cord AC power supplyRated voltage range: 100 to 240VAC, 50 Hz to 60 Hz.The following figure illustrates the partial external appearance of thepower socket for a AC-powered router:Table 10 Power input and PGNDItem DescriptionPower input Input voltage 12VDC, connected through the external powermodule to the 110/220V site powerPGND Connected to the earth ground with ground cableTable 11 Power input and PGND of other modelsItem DescriptionPower input AC model: 100 to 240VAC power input socketDC model: -48 to -60VDC power input socketPGND Connected to the earth ground with ground cable