Types of supervisory channels supported by NG WDM equipment

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The DCC channel bandwidth supported by NG WDM equipment is represented by the number of loadable 64 bytes.
The following lists the DCC channels supported by NG WDM equipment and the bandwidth:
D1-D3 3 bytes
D4-D12 9 bytes
GCC0 3 bytes
GCC12_9 9 bytes
GCC12_18 18 bytes
Pilot-tone DCC Irrelevant to byte or bandwidth

Note:
1. For the OTU boards whose WDM-side service type is SDH, the DCC channel type is D1-D3. Channels D4-D12 are not supported.
2. SC2/SC1 boards support two DCC channel types: D1-D3 and D4-D12. In normal situations, both DCC channel types can be used to transmit monitoring information. After ASON is enabled, D4-D12 can be used only as physical channels to transmit the ASON protocol.
3. For the OTU board of the OTN frame structure, three channel types are supported: GCC0, GCC12_9, and GCC12_18. For OTN boards with 2.5G rates, GCC0 and GCC12_9 are allocated. For OTN boards with 5G and 10G, GCC0 and GCC12_18 are allocated.
The bandwidth provided by GCC0 is 3 bytes, which is the same as the bandwidth of D1-D3. It is the GCC0 byte in the OTUk overhead in the OTN frame structure.
The bandwidth provided by GCC12_9 and GCC12_18 are 9 and 18 bytes respectively. They are the GCC1 and GCC2 bytes without various bandwidth in the ODUk overhead in the OTN frame structure.
4. Pilot-tone DCC is special. By coupling RF signals and service signals, pilot-tone DCC uses RF signals to carry monitoring information. Therefore, no byte or bandwidth is involved in pilot-tone DCC.

Other related questions:
Principles of choosing supervisory channels of NG WDM devices
Question: Almost all OTU boards on NG WDM devices support ESC, but SC2 boards are also configured on live networks to support OSC. When both supervisory methods are available, certain principles to choose which to use should be followed. Root cause: None Answer. If both OSC and ESC are available between two NEs, the priority of DCC channels in use are as follows: 1. GCC12_1; GCC12_9; D4-D12; D1-D3; pilot-tone DCC2. 2. If the available DCC channels have the same bandwidth, follow the sequential orders that DCC channels were identified by the NE instead of the DCC channel ID in ascending order. Generally, this is related to the order of the boards going online, namely, the NE preferentially choose the DCC channel of the board that goes online first to deliver monitoring messages. Note: Some OTU boards such as L4G can also use D1 to D3 channels by modifying the service type to SDH at the WDM side. Suggestion and conclusion: The priority of ESC monitoring channels of NG WDM is higher than OSC. When both OSC and ESC are available, the supervisory messages are preferentially delivered through ESC.

Method used to check the condition of NG WDM service channels
A meter can be used to check the condition of NG WDM service channels. A PRBS test can also be used to check the condition at deployment.

Querying of the reset records of NG WDM devices
Run the :errlog command to query reset records of NEs and the :mon-get-errlog:bid command to query reset records of boards.

Whether fibers of NG WDM NEs support automatic discovery
This function is unavailable on optical-layer boards.

FEC encoding supported by Huawei WDM equipment
Huawei WDM products provide the forward error correction (FEC), high performance forward error correction (HFEC), soft-decision forward error correction (SDFEC), and advanced forward error correction (AFEC) functions on different OTU, tributary, and line boards. The FEC, HFEC, SDFEC, and AFEC functions help decrease the OSNR requirements of the system at the receive end and extend the transmission distance between optical amplifier sections and regenerator sections. In addition, the FEC, HFEC, SDFEC, and AFEC functions help reduce bit error rate during line transmission and enhance the transmission quality of DWDM networks. Note that boards that use different FEC modes cannot interconnect with each other.

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