Table of Contents - G.9804.2 (2021) Amd. 2 (08/2024) - Indication of upstream wavelength option, modification of Deactivate_ONU-ID message and Serial_Number_ONU message,TO6 updates, and Emergency Stop state in Appendix XI

1	Scope
	1.1	Line rate parameterization and PMD specification applicability
	1.2	Compliance
2	References
3	Definitions
	3.1	Terms defined elsewhere
	3.2	Terms defined in this Recommendation
4	Abbreviations and acronyms
5	Conventions
6	ComTC layer overview
	6.1	Supported nominal line rates
	6.2	ComTC layer structure
	6.3	ComTC sublayer functions
	6.4	Management of an HSP system
	6.5	ComTC architecture
	6.6	Media access control
7	Resource allocation and quality of service
	7.1	Principles of downstream and upstream resource allocation
	7.2	Dynamic bandwidth assignment overview
	7.3	Reference model of dynamic bandwidth assignment
	7.4	DBA performance requirements
	7.5	Contention-based PON operation
8	ComTC framing sublayer
	8.1	Downstream ComTC framing
	8.2	Upstream ComTC framing
9	Encapsulation method
	9.1	XGEM framing
	9.2	XGEM frame delineation
	9.3	SDU fragmentation
	9.4	Mapping of services into XGEM frames
10	ComTC PHY adaptation sublayer
	10.1	Downstream PHY frame
	10.2	Upstream PHY frames and upstream PHY bursts
	10.3	Forward error correction
	10.4	Scrambling
	10.5	Downstream interleaving
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11	PLOAM messaging channel
	11.1	Overview
	11.2	PLOAM message format
	11.3	PLOAM message definitions
	11.4	PLOAM message operation categories
12	ONU activation cycle
	12.1	Overview
	12.2	Activation outline
	12.3	Causal sequence of activation events
	12.4	ONU activation cycle state machine
	12.5	OLT support of ONU activation
	12.6	TWDM ONU power levelling
13	OLT and ONU timing relationships
	13.1	ONU transmission timing and equalization delay
	13.2	Time of day distribution
14	Performance monitoring, supervision, and defects
	14.1	Performance monitoring
	14.2	Defects
15	Security
	15.1	Threat model
	15.2	Authentication
	15.3	Key derivation
	15.4	XGEM payload encryption system
	15.5	Data encryption key exchange and activation mechanism
	15.6	Integrity protection and data origin verification for PLOAM
	15.7	Integrity protection and data origin verification for OMCI
	15.8	Integrity and data origin verification key switching
	15.9	HSP systems with reduced data encryption strength
16	Power management
	16.1	Power management configuration and signalling
	16.2	Power management parameter definitions
	16.3	Power management state machine specifications
	16.4	Management transactions in the LowPower state
	16.5	Power saving by channel selection
17	TWDM channel management
	17.1	TWDM profile announcement
	17.2	TWDM ONU calibration
	17.3	TWDM ONU wavelength channel handover
	17.4	TWDM ONU wavelength channel locking
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	17.5	Temporary suspension of a bonded wavelength channel
18	TWDM system protection
	18.1	OLT CT coordination in 1:1 Type B protection
	18.2	OLT CT Type B protection state machine
	18.3	Simplified state transition diagram
19	Rogue behaviour and its mitigation
	19.1	Rogue ONU behaviour model
	19.2	Behaviour model when coexisting with legacy ONUs
	19.3	Protection from noise and alien ONUs
	19.4	Troublesome ONU presence detection enabled through idle window
Annex A � Hybrid error control (HEC) decoding and scrambler sequence codes
Annex B � Forward error correction
	B.1	Low density parity check (LDPC) codes
Annex C � Secure mutual authentication via OMCI
Annex D � Secure mutual authentication using IEEE 802.1X
Annex E
Annex F � Tuning sequences
Annex G � Transcoded framing with FEC and OAM for PtP WDM AMCC TC
Annex H � Wavelength channel bonding
	H.1	Bonded ONU activation
Annex I � Predefined preamble patterns
I.1
Appendix I � Downstream line data pattern conditioning
Appendix II � Time of day derivation and error analysis
Appendix III � Burst profiles
	III.1	Recommended seeds for preambles based on PRBSs
	III.2	Recommended PSBu structure for 12.5�Gbit/s upstream rate
Appendix IV � Golden vectors
	IV.1	50G downstream FEC codeword
	IV.2	PSBu segment preamble based on PRBSs
	IV.3	Golden vectors of AES-128
	IV.4	256-bit MSK derivation
	IV.5	Golden vectors of AES-256
	IV.6	Golden vectors of SM4
	IV.7	Golden vectors of Camellia-128
	IV.8	Golden vectors of Camellia-256
	IV.9	Upstream FEC codeword examples
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Appendix V � Protection examples
Appendix VI � ICTP: Inter-channel-termination protocol
Appendix VII � ONU equalization delay coordination across TWDM channels
Appendix VIII � PON-ID and system identifier examples
Appendix IX � Quiet window elimination in ONU activation
	IX.1	Scenario A: new dedicated activation wavelength (?DA)
	IX.2	Scenario B: legacy dedicated activation wavelength (?DA)
	IX.3	Scenario C: legacy dedicated activation wavelength (?DA)
Appendix X � 50G ONU synchronization state machine and transition criteria
	X.1	Transition criteria in ONU synchronization state machine
	X.2	ONU synchronization state machine
Appendix XI � ONU in the Emergency Stop state
Bibliography