TBR21 is a European telecommunications standard published by ETSI, and is the standard to which all telephone equipment must adhere to, to be allowed connection to Europe's public switched telephone network.
It is somewhat equivalent to the US part 68 standard.
TBR-21 has been replaced by the new ETSI standard ES 203-021
The "advisory notes" (ATAAB notes) are no longer being maintained.
- "Nemko USA, Inc". Ts.nist.gov. Retrieved 31 May 2019.
- "ETSI ES 203 021-1 V2.1.1 (2005-08) : ETSI Standard Access and Terminals (AT); Harmonized basic attachment requirements for Terminals for connection to analogue interfaces of the Telephone Networks; Update of the technical contents of TBR 021, EN 301 437, TBR 015, TBR 017; Part 1: General aspects" (PDF). Etsi.org. Retrieved 31 May 2019.
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