Difference between logical fibers on a WDM/OTN device and those on an MSTP/SDH device

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Each logical fiber on an SDH device represents a pair of physical fibers and each logical fiber on a WDM device represents one physical fiber.

Other related questions:
Automatic fiber monitoring function of WDM devices
The TN12ST2 board can implement the fiber detection function.

Hardware differences between LWC boards on LH WDM devices
Question: SSE1LWC and SSEM1LWC are present in technical documents. Do they have any differences? Answer: SSEM1LWC is a configuration board and SSE1LWC is a finished board. The two boards can be considered as the same board in most cases, and even SSEM1LWC is regarded as SSE1LWC in communication. However, you need to differentiate them in spare parts application and rectification, because you need to provide the BOM numbers of multiple configuration modules when applying for a configuration board, but you need to provide only one BOM number when applying for a finished board.

How do I identify different fibers from their appearances
Optical fibers are classified into multimode and single-mode optical fibers: - Multimode optical fibers can be used with multimode optical modules to implement low-cost, short-distance transmission. Multimode optical fibers are classified into OM1, OM2, OM3, and OM4 types. OM1 and OM2 optical fibers are usually orange, whereas OM3 and OM4 optical fibers are usually light green. For specifications of various optical fibers, see the text printed on optical fibers. - Single-mode optical fibers, usually G.652 fibers, can be used with single-mode optical modules to implement long-distance transmission. Single-mode optical fibers are yellow.

Command for deleting fiber connections of OTN devices
:cfg-del-fibermgr:SrcNeid,SrcBid,SrcPort,DstNeid,DstBid,DstPort

Differences between an ASON network and a common SDH network
Differences between an ASON network and a common SDH network: In an ASON network, services are classified into several protection levels including diamond, gold, silver, copper and iron. The protection level can be enhanced and the service rerouting function is added in an ASON network. As a result, the actual bandwidth utilization of an ASON network is higher than 50%. A common network does not have the rerouting function.

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