Table of Contents - K Suppl. 33 (06/2026) - ITU-T K.11 – Supplement on the protection of information and communication technology equipment with DC power supply against temporary overvoltage (TOV) in telecommunication centres

1	Scope
2	References
3	Definitions
	3.1	Terms defined elsewhere
	3.2	Terms defined in this Supplement
4	Abbreviations and acronyms
5	Conventions
6	Direct current temporary overvoltage source
	6.1	General
	6.2	Earthing of medium-voltage systems
	6.3	Earthing of the low-voltage system
	6.4	Medium voltage failover
	6.5	Source and path of DC TOV
7	DC TOV damage mechanism
8	DC TOV protection
	8.1	Eliminating the TOV source
	8.2	Disconnecting the TOV transfer path
	8.3	Enhancing TOV resistance-active discharge
	8.4	Intelligent circuit breaker solution
	8.5	Equipotential bonding protection TOV
9	Simulated DC TOV test
	9.1	AC TOV test equipment
	9.2	Example of circuit for testing under DC TOVs
	9.3	Simplification of DC TOVs test circuit
Appendix I – Quantitative analysis of DC TOV
Bibliography