TR-41 Performance and Accessibility for Communications Products

Committee TR-41 develops and maintains voluntary standards for the performance and accessibility of communications products. The products addressed by these standards include telephones with handsets, headsets, and speakerphones, communications gateways, and other products that are typically installed at the user’s premises. The products may connect to a communications network using digital and analog wireline or radio (e.g., Wi-Fi® or Bluetooth®) media. They may connect directly to the network or through another device (e.g. a USB headset connected through a computer). TR-41’s standards may include performance requirements for voice, video, and other features that are associated with communications services. They cover requirements for a product’s performance related to signal transmission, environmental impacts, interfacing to networks and other equipment, accessibility, and usability. TR-41 addresses issues pertaining to administrative aspects of regulatory product approval processes and develops criteria for preventing harm to the telephone network, which become mandatory when adopted by the Administrative Council for Terminal Attachments (ACTA). TR-41 is a point of contact for expert technical opinions, advice, and actions for standards development for government agencies that deal with communications including the FCC. It also provides input to other organizations that develop and publish product safety standards.

TR-41 Leadership

Chair AST Technology Labs, Inc. James Bress

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TR-41 Top Standard Documents

  • TIA-470 Telephone Terminal Equipment Performance Standards: a comprehensive set of acoustic performance requirements for analog telephones, which address acoustic transmission, electrical-interface, and telephony features.
  • TSB-32-A Overall Transmission Plan Aspects for Telephony in a Private Network: This TSB (created in partnership with ETSI) provide the planners of multi-national and trans-continental private networks with the transmission planning principles and examples which will enable them to design a loss and level plan for the network and optimized the desired level of voice quality between users and between networks.
  • TSB-129-B Telecommunications Telephone Terminal Equipment U.S Regulatory Approval Guide: provides guidance to responsible parties (based on FCC Rule 47 C.F.R. Part 68) who wish to achieve approval of Telephone Terminal Equipment (TTE) for connection to the U.S. public switched telephone network by the Supplier's Declaration of Conformity or Telecommunication Certification Body methods.
  • IP Telephony Equipment (VoIP) Standards (free): includes TIA-811-A Performance and Interoperability Requirements for Voice-over-IP Telephones TIA-912-B Voice Gateway Transmission Requirements, TIA-1057 Link Layer discovery Protocol For Media Endpoint Devices, TSB-116-A Voice Quality Recommendations for IP Telephony, TSB-146-A IP Telephony Support for Emergency Calling Service, TSB-160 Synchronization in IP Networks, and TIA-1003 Requirements for a Wireless LAN Based IP Telephony Endpoint.
  • Terminal Equipment Standards for Digital Telephones (free): includes TIA-920.000-A Overview of Acoustic Requirements for Wideband Digital Wireline Telephones TIA-920.110-A ATransmission Requirements for Wideband Digital Wireline Telephones with Handset and TIA-920.130-A Transmission Requirements for Wideband Digital Wireline Telephones with Headset.

Video Gallery

Overview of TR-41 Acoustic Accessibility Standards, James R. Bress.

Overview of TR-41 Acoustic Accessibility Standards, James R. Bress.

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