ITU-T Work Programme

[2025-2028] : [SG15] : [Q2/15]

[Declared patent(s) ] - [Associated work]

Work item: G.9805 (2022) Amd.2

Subject/title: Coexistence of Passive Optical Network Systems - Amendment 2

Status: Consented on 2025年10月24日 [Issued from previous study period]

Approval process: AAP

Type of work item: Recommendation

Version: -

Equivalent number: -

Timing: 2025-10 (Medium priority)

Liaison: -

Supporting members: -

Summary: Recommendation ITU-T G.9805 presents three methods for the coexistence of multiple PON generations on a common ODN: Coexistence element (CE), multi-PON module (MPM), and splitter-based. These allow the reuse of already deployed fibre and splitters when evolving a legacy PON to a higher capacity. Methods for calculating required isolation for Coexistence element, filter considerations for HSP and XG(S)-PON OLT, and optical interface parameters for GPON/XG(S)-PON MPM supporting Class B+, C+ and D OPL are also described. Amendment 1 includes additional 3-gen PON systems coexistence methods, and Crosstalk analysis between PON systems. Amendment 2 includes Class C+ and D OPL specifications for GPON/XG(S)-PON 2-generation MPM and GPON/XG(S)-PON/50G-PON 3-generation MPM, and specifications for 10G-EPON/50G-PON 2-generation MPM and EPON/10G-EPON/50G-PON 3-generation MPM. The 12.5Gb/s upstream line rate option for 50G-PON is deprecated.

Comment: -

Reference(s):

[SG15-TD117-R1/PLEN (2025-10) ]

Historic references:

[SG15-TD42-R1/WP1 (2025-03) ]

Contact(s):

Dekun LIU, Editor

Dezhi (James) ZHANG, Editor

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