33.040.01

Telecommunication systems in general

33.040.20

Transmission systems

33.040.30

Switching and signalling systems

33.040.35

Telephone networks

33.040.40

Data communication networks

33.040.50

Lines, connections and circuits

33.040.60

Powerline telecommunications

33.040.99

Other equipment for telecommunication systems
IEC 62037-1:2025

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IEC 62657-2:2025

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25/30509463 DC:2025

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NF EN 61850-6/A2, C46-908-6/A2 (01/2025)

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DIN EN 61850-5:2025-01

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IEEE 3800:2024

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