Dell PowerConnect 5548 User Guide - Page 42

SFP LEDs The SFP+ ports each have two LEDs, marked as LNK and ACT, associated with them. Figure 5-5 describes these LEDs. Table 3-5. SFP Port LEDs LED LNK Color Solid green Solid amber Description Link is at highest speed. Link is at lowest speed. ACT Off Flashing green Port is currently not linked. Port is either transmitting or receiving. Stack ID LED The front panel of the device contains a Stack ID panel used to display the Unit ID for the Stack Master and members, as shown in Figure 5-2. Power Supplies The device has an internal power supply unit (AC unit) and a connector to connect PowerConnect 5500/P devices to a PowerConnect EPS-470 unit, or to a PowerConnect MPS-600 unit. The PowerConnect 5500/P devices have the following internal power supplies: • 24 Port non-PoE devices - 54 Watt. • 48 Port non-PoE devices - 100 Watt. • 24/48 Port PoE devices - 600 Watt. Operation with both power supply units is regulated through load sharing. Power supply LEDs indicate the status of the power supply. The AC power supply unit operates from 90 to 264 VAC, 47 to 63 Hz. The AC power supply unit uses a standard connector. A LED, shown in Figure 5-3, indicates whether the AC unit is connected. When the device is connected to a supplementary power source, the probability of failure in the event of a power outage decreases. 42 Dell PowerConnect 55xx Systems User Guide