Operation and Maintenance > Administrator Guide > Routine Maintenance > Checking Equipment Indicators

The OSU board provides access services for analog terminals and trunks.

Figure 1 shows the OSU board.

Figure 1 Description of OSU board indicators

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Indicators in different status represent the running status of the device. Table 1 describes the indicator status.

Table 1 Status of OSU board indicators

Indicator	PWR	Color	Status Description	Troubleshooting
Power indicator	PWR	Green	ϒ⁄Steady on: Power is supplied. ϒ⁄Off: No power is supplied or the board is faulty.	ϒ⁄No power supply. When this occurs, check the power cable connection. ϒ⁄Board fault. See Emergency Maintenance of the UScale X1900 series to rectify the fault.
Running indicator	RUN	Green	ϒ⁄Blinking (4 Hz): The board is loading software. ϒ⁄Blinking (2 Hz): The board is running normally and a user is in off-hook state. ϒ⁄Blinking (0.5 Hz): The board is running normally and no conversation exits. ϒ⁄Blinking (1 Hz): The communication is abnormal. ϒ⁄Steady on: The board is incorrectly installed or faulty. ϒ⁄Off: No power is supplied or the board is faulty.	ϒ⁄No power supply. When this occurs, check the power cable connection. ϒ⁄Board fault. See Emergency Maintenance of the UScale X1900 series to rectify the fault.
Alarm indicator	ALM	Red	ϒ⁄Steady on: The communication is abnormal or the board is incorrectly installed or faulty. ϒ⁄Off: The board is running normally.

Checking OSU Board Indicators