Dear Tony, Chao, Scott, and Mehmet,
I have a question regarding your proposed 1Gbps LS modulation in
Schedl_etal_3dm_01_0926.pdf. On slide 8 it is stated that the changes are provided in chini_3dm_02a_D2d0_1G_comments-preview.pdf, but slides 9 through 11 propose a different RS-FEC for the 1Gbps link. Can you please clarify whether
the intention is to update the RS-FEC, or keep the description in chini_3dm_02a_D2d0_1G_comments-preview.pdf?
The following is my understanding of the RS-FEC description in the two documents:
The Previous Description (Chini Document)
In chini_3dm_02a_D2d0_1G_comments-preview.pdf (Figure 192-hh), the 1 Gb/s LS path uses the RS-FEC(128,122) encoder—which is the FEC currently used for the HS path:
- FEC: 6 × RS-FEC(128,122) superframes (with L=2 interleaving) = 12,288 PAM2 symbols
- Padding: 32 Bytes = 256 PAM2 symbols
- Total LS Burst: 12,544 PAM2 symbols
The New Description (Schedl, et al. Proposal)
In Schedl_etal_3dm_01_0926.pdf (Slides 8-11), the 1 Gb/s LS path is changed to use the RS-FEC(130,124) encoder—which is the FEC already used by the 100 Mb/s LS path:
- FEC: 6 × RS-FEC(130,124) superframes (with L=2 interleaving) = 12,480 PAM2 symbols
- Padding: 8 Bytes = 64 PAM2 symbols
- Total LS Burst: 12,544 PAM2 symbols
Ragnar
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