OTN overheads

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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.

Other related questions:
Whether LMP uses OTN overheads or DCC overheads
LMP stands for Link Management Protocol. For optical-layer ASON services, LMP uses the DCC bytes of the OSC channels. For electrical-layer ASON services, LMP uses OTN overheads.

Monitoring sections of PM and TCM overheads in OTN overheads
The SM, PM, and TCM overheads are generated at the source node and terminated at the sink node. The corresponding boards at the source and sink nodes monitor the signals and report the performance of the signals. The SM overheads need to be terminated and then regenerated at all the nodes that have the 3R functions. That is, all the boards that support the OTN interface must process the SM overheads. The PM overheads are terminated at the sink node of a channel. The TCM overheads can be terminated at a selective sink node based on the actual situation. The TCM overheads have six levels and three allocation modes (cascaded, nested, or overlapped), which can be determined flexibly as required.

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.

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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