OTU boards supporting CAR

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Among the OTU boards, only LEX4 and LEM24 boards support CAR.

Other related questions:
Optical ports of the OTU board
The OTU board provides two groups of optical ports: IN/OUT and Rx/Tx. The IN and OUT ports correspond to WDM-side input and output, and the Rx and Tx ports correspond to SDH-side input and output. The WDM side is also called the line side; the SDH side is also called the client side. In the alarm parameters, 1 indicates the WDM-side transceiver optical port, and 2 indicates the SDH-side transceiver optical port. In some documents, the optical ports of the OTU board are classified into system-side and line-side ports. In the early period, the system side is also called the client side.

Whether a board with FEC disabled can be interconnected with an OTU board that does not support FEC
Question: When the 73TRC board with FEC disabled is interconnected with the TWC board, the R_LOF alarm is reported at the receive end and services are unavailable, and even the R_LOS alarm is reported in some cases. Answer: 1. Functioning as a regeneration board of 73LWC, 73TRC also has the FEC function and has the same rate (2.66G) as 73LWC. After the FEC function is disabled on a board, FEC will not be performed at the receive end of the board; the signals transmitted at the transmit end, however, still contain FEC code. In other words, the board rate remains 2.66G. 2. You can use any of the following three methods to disable the FEC function of a board: Use the following command (applicable to NEs on the 5.0 platform): :cfg-set-fec: bid, port, path, enable/disable Use S3 DIP switches. S3.1 specifies the board type. 0: LWC 1: TRC S3.2 specifies whether FEC is configured. 0: with FEC 1: without FEC Use the :ptp,bid,f1,0; command. (The last byte 0 indicates that FEC is configured but 1 indicates that FEC is not configured.) For the 72LWC board, you can use only the PTP command because the board does not have S3 DIP switches. Use the :ptp:bid,b4,1; command. (The last byte 0 indicates that FEC is not configured but 1 indicates that FEC is configured.) Note: The meaning of the last byte in the command for the 71LWC board is opposite to that for the 72LWC board. The FEC setting and cancellation commands for the 71TRC board are the same as those for the 71LWC board, but the parameters are different. Command for setting the FEC mode: Ptp:slot ID,f1,2 (like S3.2 DIP switch setting to 0) Command for canceling the FEC mode: Ptp:slot ID,f1,3 (like S3.2 DIP switch setting to 1) 3. The regeneration boards as follows: The regeneration board of the TWC board is TWC, at a rate of 2.48G. The regeneration board of the 71LWC board is 71TRC, at a rate of 2.66G. The regeneration board of the 72LWC board is 72TRC, at a rate of 2.66G. The regeneration board of the 73LWC board is 73TRC, at a rate of 2.66G. Suggestion and conclusion: Assume that site A and site B are interconnected using an LWC board separately. LWC (A) ----- LWC (B) If you disable the FEC function of the LWC board at site A, the signals transmitted at the WDM side of the LWC board at site A remain unchanged, and the signal structure is still marked with FEC redundancy code and the rate is still 2.66G. However, the receive end on the WDM side of the LWC board at site A does not perform error correction. In this case, if the signals received by site A from site B contain bit errors, site A still transparently transmits the signals containing bit errors to the downstream site. Disabling the FEC function aims at testing the FEC coding gain of the board, rather than interconnecting with the boards that do not have the FEC function. The rate of 2.5G boards without the FEC function is 2.48G, whereas the rate of 2.5G boards with the FEC function is 2.66G. Therefore, the boards cannot be interconnected. Note that the FEC enabling status must be restored after the test.

Whether dispersion compensation is required for OTU boards
Dispersion compensation is not required on the WDM side of OTU boards. Dispersion compensation is generally performed between OA boards.

Wavelength tuning range of 5G OTU boards
LQG boards support wavelength tuning but OSN 8800 does not support 5G boards such as LQG boards. Therefore, no wavelength tuning for 5G boards is described in the OSN 8800 Product Description, but wavelength tuning for 5G boards is described in the OSN 6800 and 3800 Product Descriptions. For details, see the specifications of 5G boards in the OSN 6800 and 3800 Product Descriptions.

Redundant range of an OTU board on an OTN device
The suggested redundant range is 10 km to 30 km.

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