Installation ManualH3C S7500 Series Ethernet Switches Chapter 1 Product Overview1-11Note:If the FAIL LED on the S7503 is on, it is also possible that the power module is inposition but the power switch is not turned on.III. Fan tray LEDs (FAN)FAN: The LEDs of the fan tray show the status of the fan tray.Table 1-10 Description of fan tray LEDsLED State descriptionOK (Green) ON: The fan tray operates normally.OFF: The fan tray is faulty or the fan tray is not in position.FAIL (Red) ON: The fan tray is faulty or the fan tray is not in position.OFF: The fan tray operates normally.1.3.6 RESET Buttonz If a switch is equipped with one SRPU, the switch will be reset after you press theRESET button.z If the S7506R is equipped with two SRPUs, the active SRRU is reset and thestandby SRPU immediately becomes the active SRPU after you press the RESETbutton.1.4 Compatibility Matrix Between SRPU, Chassis and LPU1.4.1 Compatibility Matrix Between SRPU and ChassisTable 1-11 Compatibility matrix between SRPU and chassisSRPUChassis Salience III Salience III Plus Salience III EdgeS7503 XGbus √ √ √S7506 XGbus √ √ √S7506R XGbus √ √ √