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Hi, This is my proposed response to Adee’s comment #52: “Change: The 257-bit encoded data is a logically serial stream at a rate of 401.542892 Gb/s ± 100 ppm. The Payload area of the 400GBASE-ZR frame has a capacity of 402.489753 Gb/s ± 20 ppm.
To: The 257-bit encoded data is a logically serial stream at a rate of 401.5625 Gb/s ± 100 ppm. Idle blocks are removed from the 257-bit encoded data at a rate of 163832/163840 before the 257-bit encoded data is mapped to the payload area of
the 400GBASE-ZR frame. The payload area of the 400GBASE-ZR frame has a capacity of 402.489753 Gb/s ± 20 ppm. Add to the end of clause 155.2.6.8 GMP de-mapping: Idle blocks are added to the 257-bit encoded data at a rate of 163840/163832.” This change will enable 400GBASE-ZR to be interoperable with OIF 400ZR. If we do not implement this change, then then when connecting a 400GBASE-ZR to a 400ZR the rate of the 400ZR GAUI interface may be off by +149ppm. My presentation with the details of this issue can be found in:
https://www.ieee802.org/3/cw/public/23_06/bruckman_3cw_01a_2306.pdf Please let us know your opinion. Best regards, Leon To unsubscribe from the STDS-802-3-DWDM list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-DWDM&A=1 |