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Homepage
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BS Standards
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33 TELECOMMUNICATIONS. AUDIO AND VIDEO ENGINEERING
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33.040 Telecommunication systems
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 Telephone equipment
33.040.99 Other equipment for telephone and telegraph communications telecommunication systems