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

The MTU board is a media-trunk resource board that connects to digital trunks, plays announcements, and holds conferences.

Figure 1 shows the MTU board.

Figure 1 Description of MTU board indicators

U1900_mntg_image_f_u1960_mntg_00227_01

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

Table 1 Status of MTU board indicators

Indicator	PWR	Color	Status Description	Troubleshooting
Power indicator	PWR	Green	ϒ⁄On: The power supply is normal. 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: The board is running normally. ϒ⁄Steady on: The board is faulty. ϒ⁄Off: No power is supplied or the board is faulty.	Board fault. See Emergency Maintenance of the UScale X1900 series to rectify the fault.
Alarm indicator	ALM	Red	ϒ⁄Steady on: A critical alarm exists. ϒ⁄Blinking: A major or minor alarm exists. ϒ⁄Off: No alarm exists.
Signal loss indicator	LOS	Yellow	ϒ⁄Steady on: Signals are lost. ϒ⁄Off: Signals are normal.	Signal loss. Contact the service provider.
Remote alarm indicator	RFA	Yellow	ϒ⁄Steady on: The peer device fails to receive data. ϒ⁄Off: The peer device is running properly.	Data receiving fault on the peer-end device. Contact the service provider.

Checking MTU Board Indicators