Rates of OTN frame structures at each WDM level


OTUk rate = 255/(239 �?k) x STM-N frame rate
ODUk rate = 239/(239 �?k) x STM-N frame rate
OPUk payload rate = 238/(239 �?k) x STM-N frame rate
1. ODU0 and OTU5G do not use the standard frame structure of the G.709 protocol and therefore do not comply with the preceding formulas.
2. An ODU0 encapsulates one GE service and is cross-connected between an OTU board and an XCH or XCM board. ODU0 cannot be configured for an XCS board. OTU boards do not provide OTU0 ports on their WDM sides.
3. One OTU5G encapsulates four GE services. Currently, only L4G and LQG boards provide OTU5G ports on their WDM sides. 2 666 057.143 kbit/s = 255/238 × 2488320 kbit/s
OTU5G: 5 Gbit/s
OTU2: 10709225.316 kbit/s = 255/237 × 9953280 kbit/s
OTU3: 43018413.559 kbit/s = 255/236 × 39813120 kbit/s
ODU0: 1.25 Gbit/s
ODU1: 2498775.126 kbit/s = 239/238 × 2488320 kbit/s
ODU2: 10037273.924 kbit/s = 239/237 × 9953280 kbit/s
ODU3: 40319218.983 kbit/s = 239/236 × 39813120 kbit/s
OPU1: 2488320 kbit/s
OPU2: 9995276.962 kbit/s = 238/237 × 9953280 kbit/s
OPU3: 40150519.322 kbit/s = 238/236 × 39813120 kbit/s

Other related questions:
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.)

Method to query the wavelength information of a line board on WDM/OTN equipment
In the NE Explorer, select the target board and choose Configuration > WDM Interface from the navigation tree. On the Advanced Attribute tab, wavelength information is displayed.

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
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.

Rerouting rules of Huawei WDM/OTN ASON systems
Through traffic engineering, a WDM/OTN ASON network has various rerouting constrains: 1. Constraints on explicit network resources: explicit nodes, links, wavelengths, and channels 2. Constraints on excluded network resources: excluded nodes and links 3. Limitation on the quantity of nodes (or hops) traversed by a strict route or service 4. Limitation on the reach of an optical fiber carrying services, loading sharing mode, SRLGs, and associated services 5. Combinations of the preceding constraints

Difference between conventional WDM equipment and OTN equipment
Both of them use the DWDM technology. The difference between them lies in that OTN equipment can achieve electrical cross-connection scheduling for various types of services.

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