Dell Force10 S25N-S50N Installing S50N and S50V Systems - Page 15

Figure 3-1. The S50N-DC Rear View Label (Part #, Serial #, MAC Address, Bar Code, FRU #) 10-Gigabit Modules or Stacking Modules (optional). Optical ports numbered from left to right. DC2 -48V RTN -48V FG -48V RTN -48V FG Ethernet Port Numbers 49 to 52, Right to Left Ground Connector DC1 fn00158s50N-DC S50N and S50V CAUTION: The power supply cord is used as the main disconnect device; ensure that the socket-outlet is located/installed near the equipment and is easily accessible. As shown in Figure 2-2 on page 9, the rear of the S50N and S50V models have both an auto-sensing 110/ 220V AC receptacle and a standard -48V terminal-type DC connector. The rear of an S50N differs only in the arrangement of the lugs on its DC terminal block (Figure 3-1). Each system ships only with the AC power cord. There is no power switch. Connecting the switch to either an AC or DC power source starts the switch. On both the S50N and S50V, either the AC or DC power supplies alone are sufficient to power the switch. When both AC and DC power supplies are connected, they act in roughly a 60%/40% load-sharing mode. On the S50V, when the Dell Force10 470W DC Backup Power Supply is connected to the Current Sharing connection on the S50V DC terminal block, the switch uses the DC and AC power supplies in current-sharing (load-sharing plus additive) mode, so that the total capability is 470W+470W = 940W. See Backup Power Components on page 29. Dell Force10 also offers an external 180W DC power supply for the S50N and S50N-DC models, the same power supply used by the S50. However, the connections differ from those on the S50, so the power supply ships with DC cables to support each model. Rack-mounting hardware is supplied. For details on connecting to a power source, see Supplying Power on page 27. Power over Ethernet (PoE) Support Along with the optional DC power supply noted above, the S50V includes an internal 470W power supply that supports both the operation of the switch and an independent power distribution system to supply power to the 48 copper Ethernet ports, supporting the IEEE 802.3af standard for Power over Ethernet (PoE). Connect only powered devices that adhere to IEEE 802.3af. Site Preparations | 15