K-byte pass-through modes in the SDH frame structure

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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.)

Other related questions:
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.

Do AC interfaces allow Jumbo frames to pass through
Ethernet frames longer than 1518 bytes or VLAN frames longer than 1522 bytes are called Jumbo frames. During a high-throughput data exchange such as a file transfer, an Ethernet interface of an AC may receive Jumbo frames. The AC discards Jumbo frames without processing them. When the Ethernet interface is configured to allow Jumbo frames to pass through, the AC processes the received Jumbo frames with the length within the specified range. Run the jumboframe enable [ value ] command in the interface view to configure an interface to allow Jumbo frames to pass through. In the command, value specifies the maximum length of Jumbo frames that are allowed to pass through an Ethernet interface. The value is an integer that ranges from 1536 to 12288, in bytes. Note: Fat APs do not support this command.

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

Whether the multiplexing from four ODU1 signals to one ODU2 signal is similar to the SDH multiplexing (both implemented in byte interleaved mode)
Yes. Both are implemented in byte interleaved mode.

Fiber connections for pass-through wavelengths
The typical subrack fiber connection diagram in the product documentation provides all types of fiber connections. For details about the fiber connections for pass-through wavelengths, see the related topic in the product documentation.

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