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Hydrogen Technologies Standards form the basic framework for market ramp-up
More information
Climate change Standards and specifications support climate targets
More information
Smart Farming Standards and specifications are drivers for the digitalization of agriculture
More information

Standards [CURRENT]

UNE-TBR 17
BUSINESS TELECOMMUNICATIONS (BTC). ORDINARY AND SPECIAL QUALITY VOICE bandwidth 4-wire analogue leased lines (A4O and A4S). Attachment requirements for terminal equipment interface.

Edition 1997-07-15

Original language Spanish

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Hydrogen Technologies Standards form the basic framework for market ramp-up

Climate change Standards and specifications support climate targets

Smart Farming Standards and specifications are drivers for the digitalization of agriculture

UNE-TBR 17 BUSINESS TELECOMMUNICATIONS (BTC). ORDINARY AND SPECIAL QUALITY VOICE bandwidth 4-wire analogue leased lines (A4O and A4S). Attachment requirements for terminal equipment interface.

Want to learn more?

UNE-TBR 17
BUSINESS TELECOMMUNICATIONS (BTC). ORDINARY AND SPECIAL QUALITY VOICE bandwidth 4-wire analogue leased lines (A4O and A4S). Attachment requirements for terminal equipment interface.