Difference between optical and electrical regeneration modes

Electrical regeneration mode: In earlier versions before the optical regeneration mode is introduced, only the electrical regeneration mode is used.
Optical regeneration mode: This mode is introduced to achieve OCh-level E2E management for ASON services when the ASON services traverse regeneration boards. This mode also applies to the management scenario where two ASON LSPs are available when ASON services traverse regeneration boards in earlier versions.
In both modes, service signal processing is the same. The differences between the two modes are as follows:
1. The trail management modes on the NMS are different. In electrical regeneration mode, OCh trails on the NMS cannot pass through and four independent OCh trails are formed. In optical regeneration mode, OCh trails on the NMS can pass through to form two E2E OCh trails, which facilitates management.
2. The optical regeneration mode is introduced in ASON trail management, with the purpose to enhance optical-layer trail maintainability. When optical-layer ASON is enabled, the optical regeneration mode must be used. Due to historical reasons, the electrical regeneration mode is always retained after the optical regeneration mode is proposed. The two modes have almost the same implementation mode and performance on the NE software.

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