Functions of the clock module on a system control board

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The clock module on a system control board processes only the clock signals sent from an OSC board.
When ESC is used, an STG board is used to process the clock signals. The STG board extracts the line clock signals on optical ports of service boards. Optical signals are at a specific frequency. After the optical module converts an optical signal into an electrical signal, the CDR restores the clock (high frequency) and data of the signal. The low frequency (about 8 kHz) derived by frequency dividing on the clock frequency, is the line clock.

Other related questions:
Whether the XCH board provides the system control function
Yes, it does.

Function of the ALM CUT button on the system control board
It is used to mute subrack alarms. If you transiently press this button, the current alarm is muted. If you press and hold this button for 5s, the audible alarming function is disabled and the ALMC indicator on the system control board becomes steady on. (If you press and hold this button for 5s again, the audible alarming function is enabled and the ALMC indicator on the board is off.)

Function of the Ethernet port on the system control board of Metro 1000
The Ethernet port on the Metro 1000 is adaptive to RJ-45 connectors and is used for NMS access management. The port rate is 10 Mbit/s or 100 Mbit/s.

Function of the RESET button on the system control board of the OSN 6800
The RESET button resets the system control board.

Functions and replacement precautions for the system control board in an OSN 6800 slave subrack
The SCC board in a slave subrack provides the following functions: 1. Communicates with the boards without software to control the working status of the boards. 2. Receives overhead signals from service boards by using RS485A or RS485B buses and processes the overhead signals. 3. Processes the overhead signals that are transmitted from the master subrack and delivers them to the service boards. 4. Detects whether each board in a subrack is online and uses the AUX board to report the status information to the system control board in the master subrack. 5. Provides two RS485 buses for urgent data transmission. 6. Provides required power supplies for the local board and provides 3.3 V centralized power supply backup for the entire OSN 6800 system. In addition, provides power supply backup for the boards whose maximum power consumption is less than 60 W. However, it provides power supply backup only for one board at a time.

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