23Figure 18 PGND screw of the routerUse a PGND cable to connect the screw to the earth ground, and the grounding resistance should not begreater than 5-ohm. Likewise, if the router is installed in a 19-inch standard rack, this rack is required tobe grounded too.WARNING!When the router is in normal operation, it is required to be well grounded. Otherwise, the router cannotreliably avoid lightning, which may damage the router itself and even the peer device.Connecting the Power CordBased on power supply mode, the MSR 50-40 and MSR 50-60 each have two models: DC, AC. You canchoose suitable models as needed.Power Input and PGNDTable 16 Power input and PGND of the MSR 50-40 and MSR 50-60 routersItem DescriptionPower input (AC-powered) Provide 100 VAC to 240 VAC power socketPower input (DC-powered) Provide –60 VDC to –48 VDC power socketPGND Connected to the earth ground with ground cableConnecting the AC Power CordAC power supplyAC input range: 100 VAC to 240 VAC, 50 Hz to 60 HzThe following figure illustrates the power socket and switch for an AC-powered router:
