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STAT light: indicates the current working status of the single board
1) Bright (green) The single-board is working normally 2）亮（红色） 单板硬件故障或无接口板以及接口板故障
3) 100 ms on 100 ms off (red) The single-board hardware does not match (e.g., the business board and the interface board do not match)
4）灭 单板没有上电
1）亮（绿色）FLASH中单板软件或FPGA存储加载正常；或者单板软件初始化正常；
2) 100 ms on 100 ms off (green) Loading single-board software into FLASH or FPGA
3）300毫秒亮300毫秒灭（绿色） 单板软件正在初始化，正处在BIOS引导阶段；
4) on (red) Single-board software or FPGA in FLASH is lost, unsuccessful loading, unsuccessful initialization
Lights up (green) The service works normally and no service alarms are generated
亮（红色） 业务有危急或主要告警。或线路有LOS告警。
Lights up (yellow) The service has secondary and remote alarms.
灭 没有配置业务
Note that the SRV lamps of the OSN3500 SSN4GSCC, SSN1GXCSA, and SSN1EXCA indicate slightly different meanings.
On (green)
A）业务板的业务处于激活状态。
B) In TPS protection mode, if a reversal occurs and the protection board is working, the protection board lights this lamp; when there is no TPS reversal, the working board is in the working state and the working board lights this lamp.
C) 对主备交叉/主控板而言，当前的主板亮灯，可以用这个灯来判断主备关系。
Out Business is in inactive state or the board is a spare board and can be unplugged.
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