Difference between the electrical relay mode and optical relay mode

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Some boards (such as TN12ND2, TN52ND2, TN53ND2, TN57ND2, TN53NQ2, TN54NQ2, TN57NQ2, TN54NS3, and TN55NS3) can work in the regeneration mode. The regeneration mode can be optical relay mode or electrical relay mode.
The NE software implements the two modes in similar ways. The two modes differ in trail management on the NMS.
In the electrical relay mode, the board terminates OCh trails. For a service traversing an electrical regeneration board, four unidirectional service trails will be generated using the function of E2E trail management.
In the optical relay mode, however, a complete bidirectional service trail is generated using the function of E2E trail management.
The optical relay mode is introduced in ASON trail management, with the purpose to enhance optical-layer trail maintainability.
If optical-layer ASON is enabled, the optical relay mode must be used. If optical-layer ASON is disabled, either of the modes can be used and the electrical relay mode is recommended.

Other related questions:
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.

How to configure the work mode of the Combo interface of an AR router
Combo interfaces are optical-electrical multiplex Ethernet interfaces. The optical interface and the electrical interface of the combo interface cannot work at the same time. Note: Combo interfaces work in electrical interface mode by default. If you want to use the optical interface of the Combo interface, you must configure the Combo interface as follows to set it to optical interface mode. 1. Run the system-view command to enter the system view. 2. Run the interface gigabitethernet [interface-number] command to enter the view of the GigabitEthernet interface. 3. Run the combo-port { auto | copper | fiber } command to configure the work mode of the Combo interface. auto: Indicates the work mode is selected automatically. The device detects the state of the interfaces and select the work mode as follows: - If the state of the electrical interface becomes Up first, electrical interface mode is selected. - If the state of the optical interface becomes Up first, optical interface mode is selected. copper: Indicates that the work mode of the Combo interface is set to electrical interface mode by force, that is, data is transmitted through network cables. fiber: Indicates that the work mode of the Combo interface is set to optical interface mode by force, that is, data is transmitted through optical fibers.

Difference between the subcard mode and board mode
The subboard mode refers to the current working mode of a subboard. The board mode refers to the current working mode of a board. Different types of boards and subboards support different types of working modes. Many commands are used to switch the subboard mode and board mode. These commands start with set service-mode. To set the subboard mode, you can run the set service-mode card or set service-mode slot card command in the system view. To set the board mode, you can run the set service-mode slot command in the system view.

Difference between cascading mode and non-cascading mode
TOM boards can work in cascading or non-cascading mode. In cascading mode, the total client-side service rate for each TOM board must be less than or equal to 2.5 Gbit/s. In non-cascading mode, the total client-side service rate for each TOM board must be less than or equal to 10 Gbit/s. When working in cascading mode, each TOM board can map a maximum of eight client-side services into one ODU0 or ODU1 signal. When working in non-cascading mode, it can map a maximum of four client-side services into one ODU0 or ODU1 signal. To map more than four client-side services into one ODU1 or ODU0 signal, the cascading mode is recommended. To map four or less client-side services into one ODU1 or ODU0 signal, the non-cascading mode is recommended.

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