Difference between the external 2M clock schemes for OSN 8800 and OSN 6800 devices

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For 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 on OSN 8800 must work with the cross-connect board. On 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.

Other related questions:
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.

Whether the ST2 boards intended for OSN 8800 devices can be installed in OSN 6800 subracks
The ST2 boards intended for OSN 8800 devices can be installed in OSN 6800 subracks. To use the clock function of the ST2 boards, the ST2 boards must be installed in subracks that are equipped with clock boards.

Clock synchronization modes supported by OptiX OSN 8800
When an OptiX OSN 8800 device is interconnected with an MSTP or PTN device, the IEEE 1588v2, synchronous Ethernet, 2 MHz and 2 Mbit/s external clock sources are supported to implement end-to-end clock transmission. When an OptiX OSN 8800 device uses IEEE 1588v2 to implement phase synchronization, the supported NE working modes are OC, TC, BC, TC+BC, and TC+OC.

Supported protection schemes for packet services on the OSN 8800
The following protection schemes are supported for packet services on the OSN 8800: MPLS-TP tunnel APS, MPLS-TP PW APS, LAG, and MC-LAG.

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

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