Table of Contents - G.987.3 (05/2025) - 10-Gigabit-capable passive optical networks (XG-PON): Transmission convergence (TC) layer specification

1	Scope
2	References
3	Definitions
4	Abbreviations and acronyms
5	Conventions
6	XG-PON transmission convergence layer overview
	6.1	XGTC layer structure
	6.2	XGTC sublayer functions
	6.3	Management of an XG-PON system
	6.4	Time division multiplexing architecture
	6.5	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
8	XG-PON transmission convergence layer framing
	8.1	Downstream XGTC framing
	8.2	Upstream XGTC framing
9	XG-PON encapsulation method
	9.1	XGEM framing
	9.2	XGEM frame delineation
	9.3	SDU fragmentation
	9.4	Mapping of services into XGEM frames
10	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
11	PLOAM messaging channel
	11.1	Overview
	11.2	PLOAM message format
	11.3	PLOAM message definitions
12	ONU activation
	12.1	Overview
	12.2	Activation mechanism at the ONU
	12.3	OLT support of the activation process
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13	OLT and ONU timing relationships
	13.1	ONU transmission timing and equalization delay
	13.2	Time of day distribution over XG-PON
14	Performance monitoring, supervision, and defects
	14.1	Performance monitoring
	14.2	Defects
15	XG-PON security
	15.1	Threat model for XG-PON
	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	XG-PON systems with reduced data encryption strength
16	ONU 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 during low power mode
Annex A – Hybrid error correction (HEC) decoding and scrambler sequence
	A.1	HEC decoding
	A.2	Scrambler sequence
Annex B – Forward error correction using shortened Reed-Solomon codes
	B.1	Polynomial representation over Galois field
	B.2	Construction of RS(248, 232) codeword
	B.3	Construction of RS(248, 216) codeword
Annex C – Secure mutual authentication via OMCI
Annex D – Secure mutual authentication based on IEEE 802.1X
	D.1	Introduction
	D.2	Stack model for XG-PON authentication using [IEEE 802.1X]
	D.3	Behaviour at network entry
Annex E – PON-ID maintenance
	E.1	Introduction
	E.2	PON-ID structure
Annex F – Extended rogue ONU mitigation capabilities
	F.1	Introduction
	F.2	Extra codepoint of disable PLOAM message type
	Page
	F.3	Extra transition of the ONU activation cycle state transition diagram
Appendix I – Downstream line data pattern conditioning
	I.1	Spectrum control using idle XGEM frames
	I.2	Intentional PON disruption
Appendix II – Time of day derivation and error analysis
Appendix III – Burst profiles
Appendix IV – Golden vectors
	IV.1	Downstream FEC codeword
	IV.2	Upstream FEC codeword
	IV.3	Upstream FEC short codeword
	IV.4	Downstream AES-128 encryption
	IV.5	Upstream AES-128 encryption
	IV.6	Key derivation encryption
	IV.7	Downstream PLOAM message integrity check
	IV.8	Upstream PLOAM message integrity check
	IV.9	Upstream key reporting
	IV.10	Downstream OMCI message integrity check
Bibliography