FDI in the OTN protocol

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FDI is short for forward defect indication.
An FDI packet is generated and sent to the downstream node by a node that first detects a defect. It carries information about the defect type and location. Its primary purpose is to suppress alarms at affected higher level client LSPs and (in turn) their client layers.

Other related questions:
BDI in the OTN protocol
BDI is short for backward defect indication. When the sink node of an LSP detects a defect, BDI can be used to inform the upstream end of the LSP of the downstream defect along the return path.

OTN principles
An OTN is a network consisting of optical NEs that are connected through optical fibers. It can transmit, multiplex, route, manage, monitor, and protect client signals on optical channels. A main feature of the OTN is client independence. That is, the transmission and configuration of any digital signals are irrelevant to the features of a client. OTN has the following advantages over traditional SDH: More powerful forward error correction, Tandem connection monitoring (TCM) at more levels, transparent transmission of client signals, and scalable switching capacity.

OTN overheads
The OTN optical-layer overheads include OTS, OMS, and OCh overheads and are transmitted through the OSC. OTN electrical-layer overheads include OPUk, ODUk, OTUk overheads, and the frame alignment overheads.

Supported protection schemes at the OTN layer of Huawei OTN equipment
The following protection schemes are supported at the OTN layer of Huawei OTN equipment: client 1+1 protection, intra-board 1+1 protection, OLP, ODUk SNCP, tributary SNCP, and ODUK SPRing.

Whether any OTN solutions are available
The FBB solution provides metro OTN transparent transmission and metro OTN aggregation solutions, improving fiber bandwidth utilization and transmission distance.

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