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Table 1-256 Buttons
Before removing a board, press and hold the OFL button for about 6
seconds until the OFL indicator turns on. Then, you can remove the
board.
Table 1-257 Indicators
Before the board is powered on and registers, this indicator blinks
slowly (2 Hz).
After the board is powered on and registers, if this indicator blinks at
0.5 Hz, the system is working properly.
If this indicator is steady green, the board is working properly; if this
indicator is off, the board is faulty.
When the board is working properly, the OFL red indicator is off.
After the OFL button is pressed to power off the board, the OFL red
indicator is on.
Functional Specifications
Table 1-258 Functions and features
Reliability and
availability
The 3+1 backup mode is used. The four SFUs balance services at the
same time. If one SFU is faulty or replaced, the other three SFUs
automatically take over its services to prevent service interruptions.
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