Bytes in a frame structure used for the DCC channel in the optical regeneration section and bytes used for the DCC channel in the optical multiplexing section

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Question:
What are the bytes in a frame structure used for the DCC channel in the optical regeneration section? What are the bytes used for the DCC channel in the optical multiplexing section (OMS) to transmit network management information of a WDM system?
Answer:
According to SDH principles, bytes D1-D3 are used for the regeneration section, and bytes D4-D12 are used for the OMS section. In actual product application, however, bytes D1-D3 are used for DCC communication but bytes D4-D12 are not used.

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.

K-byte pass-through modes in the SDH frame structure
1. Paired-slot pass-through: overhead pass-through between paired slots (Pay attention to the paired relationship between the slots.) 2. Paired-port pass-through: overhead pass-through between paired optical ports on a board 3. In-board pass-through: overhead self-loopback, that is, overhead pass-through between the receive end and transmit end of a board (This mode is rarely used.)

What is the maximum size (in KB) of a VU channel voice file supported by the U1900 series unified gateway?
The maximum size (in KB) of a VU channel voice file supported by the U1900 series unified gateway is calculated as follows: The data volume of an uncompressed sound is calculated based on the following formula: Data volume (bit/s) = Sampling frequency (Hz) x Sampling bits (bit) x Number of sound channels/8. According to the formula, the data volume of a monaural voice file with the sampling rate being 8 kHz and sampling bits being 8 is calculated as follows: 8000 Hz x 8 bit x 1/8 = 8000 bit/s = 7.8125 kbit/s. Based on the recording requirements on VU channel voice files, the data volume is calculated as 7.8125 kbit/s. 1. The maximum size of a VU channel voice file supported by the U1910/U1930/U1980 is 250 KB. 2. The maximum size of a VU channel voice file supported by the U1911/U1960/U1981 is 2343 KB.

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.

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