3Com 4800G Getting Started Guide - Page 43

Connecting the Power Cables and the Grounding Cable 43 3 Check whether the RPS LED on the front panel of the switch is ON. If the LED is ON, the 48V RPS is properly connected. c CAUTION: ■ Make sure that the grounding cable has been properly connected before powering on the switch. ■ The length of the DC power cable must be less than 3 m (9.8 ft). Connecting the DC power cable of the Switch 4800G 48-Port and Switch 4800G 24-Port-DC The Switch 4800G 48-Port and Switch 4800G 24-Port-DC use the 48V RPS, whose input voltage is in the range of -48 V to -60 V. Figure 40 Appearance of the -48V RPS port ˇ ˉ NULL +: -48V (return) terminal -: Negative terminal (-48 V to -60 V) NULL: Reserved 1 Connect one end of the grounding cable (delivered with the switch) to the grounding screw on the rear panel and the other end to the ground nearby. 2 Connect one connector to the RPS port on the switch and use a small flat-module screwdriver to fix the connector with two screws (delivered with the switch), as shown in Figure 41. Figure 41 Connect the 48V RPS connector to the chassis Screw 2 Connector parts Screw 1 Chassis 3 Check whether the RPS LED on the front panel of the switch is ON. If the LED is ON, the 48V RPS is properly connected. c CAUTION: Make sure that the grounding cable has been properly connected before powering on the switch.