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Work item:
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G.709.6
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Subject/title:
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Flexible OTN B400G and B1T long reach interfaces
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Status:
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Consented on 2026-07-10 [Issued from previous study period]
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Approval process:
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AAP
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Type of work item:
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Recommendation
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Version:
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Rev.
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Equivalent number:
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-
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Timing:
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2026-07 (Medium priority)
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Liaison:
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OIF, IEEE 802.3
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Supporting members:
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Adtran, China Mobile, CICT, Ciena, Fujitsu, Huawei, Nokia, ZTE
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Summary:
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Recommendation ITU-T G.709.6 specifies 400G, 800G, 1.2T and 1.6T FlexO Beyond 400G (B400G) and Beyond 1T (B1T) long-reach interfaces. The Recommendation specifies the structure using forward error correction (FEC) codes with a higher coding gain suitable for longer reach applications, and references common elements from Recommendation ITU-T G.709.1 and FEC structures from Recommendation ITU-T G.709.3.
Edition 2.0 contains the following extensions to Edition 1.0:
Add FlexO skew to scope of clause 10
Add new 1.6T and 1.2T long reach interfaces with OFEC and probabilistic constellation shaping in clause 13.
Correct Figure 8-1
Fixed typo in Table 12-3
Added digital sub-carrier nomenclature to clause 11 and 12
Corrected some typos in clause 12.4.2
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Comment:
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-
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Reference(s):
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Historic references:
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Contact(s):
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| ITU-T A.5 justification(s): |
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First registration in the WP:
2024-08-20 15:58:01
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Last update:
2026-07-21 17:06:25
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