Cause why the STG board is mandatory for the OSN 8800 but optional for the OSN 6800

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The OSN 8800 of version V100R002 or later is a synchronous system, requiring that all service boards and cross-connect boards are synchronized (with the same frequencies and aligned frame headers). Therefore, a unique reference clock signal and a unique frame header are required. To meet this requirement, each service board outputs services according to the clock signal and frame header of a clock board. Therefore, the STG board is mandatory for the OSN 8800 of version V100R002 or later. If no STG board is configured, centralized service scheduling cannot be achieved. The OSN 6800 is an asynchronous system and does not require a unique reference clock or unique frame header. Therefore, no STG board needs to be configured for the OSN 6800.

Other related questions:
Possible causes for the CHAN_ADD alarm on the MCA board of the OSN 6800/8800
The CHAN_ADD alarm indicates that single-wavelength signals are added. This alarm is generated when the MCA board detects wavelength addition after it scans the optical spectrum. The possible causes of the CHAN_ADD alarm are as follows: 1. The configurations for wavelength monitoring are incorrect. The received wavelengths are not configured as the monitored wavelengths. 2. The MCA board is faulty. The procedure for handling the CHAN_ADD alarm is as follows: 1. On the U2000, check whether the configurations for wavelength monitoring of the MCA board are incorrect. If the configurations are incorrect, modify the configurations to ensure that the monitored wavelengths and the number of monitored wavelengths are consistent with the received wavelengths and the number of received wavelengths. 2. If the alarm persists, test the optical spectrum data of the input optical signals using an optical spectrum analyzer. If the data is normal, the optical spectrum analyzer module of the MCA board may be faulty. When this occurs, replace the MCA board.

Whether the STG board is mandatory
The OSN 8800 of version V100R002 or later is a synchronous system, requiring that all service boards and cross-connect boards are synchronized (with the same frequencies and aligned frame headers). Therefore, a unique reference clock signal and a unique frame header are required. To meet this requirement, each service board outputs services based on the clock signal and frame header of the clock board. Therefore, the STG board is mandatory for the OSN 8800 of version V100R002 or later. Otherwise, centralized service grooming cannot be implemented. The OSN 6800 is asynchronous, having no requirement on a unique clock signal or frame header. Therefore, no clock board is required. The STG board is required only when IEEE 1588v2 needs to be enabled at the electrical layer.

Principles for configuring the ST2 board in the OptiX OSN 8800 T64 subrack
The ST2 board is optional for an OptiX OSN 8800 T64 subrack and is configured based on service requirements. It receives, processes, and transmits two OSC signals in the east and west directions. In addition, it can process IEEE 1588v2 synchronous clock signals and transparently transmit two FE signals. The ST2 board is not recommended for the networks where the ROP board, Raman board, HBA board, or optical-layer ASON is used. In such a network, the SC1 or SC2 board is recommended.

Scenarios in which STG is required in the OSN 6800
The OSN 6800 is an asynchronous system and does not require a unique reference clock or unique frame header. Therefore, no STG board is required. The STG board is required only when IEEE 1588v2 needs to be enabled at the electrical layer.

Different solutions for external 2M clocks of OSN 8800 and OSN 6800 devices
In OSN 8800, clock signals and frame headers do not need to pass the cross-connect board but the status signals are bound. In addition, the STG board of OSN 8800 must work with the cross-connect board. In OSN 6800, clock signals and frame headers do not need to pass the cross-connect board. Active/standby switching is implemented for cross-connect boards and STG boards in an associated way.

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