Dell Force10 S25N-S50N Installing S25N and S25V Systems - Page 32

The Power Connections on the Switch, Supplying Power

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The Power Connections on the Switch The S25N contains two AC connections, while the S25V contains one AC and one DC. An AC cable is supplied with the switch for each connection (see Supplying Power on page 29). On both systems, you can connect one or both of the inputs to power. On the S25V, if both AC and DC connections are made and able to supply power, the switch will only utilize them in load-sharing mode. If you attach the Force10 470W DC Redundant PSU, and you want to supply maximum PoE power, you connect the blue DC Current Sharing lead so that the internal and external DC power supplies can work in current-sharing mode, allowing the power supplies to work in load-sharing mode up to 470W and then in additive mode up to 940W (790W maximum for PoE). The DC input to the switch uses industry-standard terminal leads on a terminal block. The S25V has four connections - ground (FG), -48 volt input, return (RTN), and Current Sharing, as shown in Figure 16: Figure 16 DC Terminals on the S25V Danger: A qualified electrician should make the DC connections. 32 Installing Backup Power

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32
Installing Backup Power
The Power Connections on the Switch
The S25N contains two AC connections, while the S25V contains one AC and one DC. An AC cable is
supplied with the switch for each connection (see
Supplying Power on page 29
). On both systems, you can
connect one or both of the inputs to power.
On the S25V, if both AC and DC connections are made and able to supply power, the switch will only
utilize them in load-sharing mode. If you attach the Force10 470W DC Redundant PSU, and you want to
supply maximum PoE power, you connect the blue DC Current Sharing lead so that the internal and
external DC power supplies can work in current-sharing mode, allowing the power supplies to work in
load-sharing mode up to 470W and then in additive mode up to 940W (790W maximum for PoE).
The DC input to the switch uses industry-standard terminal leads on a terminal block. The S25V has four
connections — ground (FG), -48 volt input, return (RTN), and Current Sharing, as shown in
Figure 16
:
Figure 16
DC Terminals on the S25V