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Equipment Characteristics
OSN3500 subrack is divided into two layers, the upper layer is mainly for the interface board slot area, with a total of 19 slots, and the lower layer is mainly for the processing board slot area, with a total of 18 slots. The subrack adopts a double-layer subrack structure, divided into interface board area, processing board area, fan area and alignment area.OSN equipment has the management and maintenance capability of layered architecture like SDH, which simplifies the operation and maintenance of packet service and realizes end-to-end packet service configuration, debugging and fault location.
Scenario Description
When OSN equipment is newly opened, the two rings are independent of each other, but the ECCs between them are interoperable. After checking, it is because the extended ECC function is automatically enabled, so if you want the rings to be independent of each other, you need to turn off the automatic opening of the extended ECC function.
Product
OptiX OSN 3500
Fault Category
DCN Fault
Phenomenon Description
The North Ring and South Ring are formed by OptiX OSN 3500 devices, and the two rings are independent of each other. The north ring and south ring are connected to the network management in the central server room through the same HUB for unified monitoring. Checking the ECC of the network elements, it is found that the north and south rings are abnormally connected.
Cause Analysis
- Fiber connection error between the north and south rings of the central server room, for example, the fiber in the south ring is connected to the north ring.
- Problems caused by the extended ECC function
Procedure
- Confirm that there is no error in the fiber connection between the North and South rings by shutting down the laser on the network management.
- Check the ECC. since it is a new bureau, there is no setting for extended ECC beforehand, but it is found that the AUX veneer board has automatically enabled the extended ECC function. After turning off this function, the ECC between the two rings is no longer interoperable.
References
The OSI model, or Open Communications System Interconnection model, is a standardized reference model proposed by the International Organization for Standardization (ISO) to describe how different pieces of hardware and software involved in network communications should be divided and communicate with each other. It defines a seven-layer collection of functional components, from the physical interconnection layer (also known as the physical layer, or physical interface layer) at layer 1 to the application layer at layer 7. The TCP/IP protocol does not map one-to-one to the OSI model because it was developed prior to the OSI model, and is intended to solve a specific set of problems rather than provide a generic description of all network communications. When an application needs functionality that cannot be found in the TCP/IP protocol, the application can provide that functionality and call it. the OSI model assumes that the functionality of each layer is already defined, and that an application will never call the self-contained functionality again because the interfaces between the layers abstract away so much of the detail that it may not be possible to implement the call. Opening the OSI protocol at the network interface also results in ECC interworking between independent subnets. For more information, see "MC-B9 Devices Not Connected to Fiber but ECC Interworking".
