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Explore TIA's role in developing standards for cordless phones, addressing interference issues, and promoting accessibility for users with hearing aids. Learn about the industry response and ongoing initiatives.
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gsc11_userworkshop_12 HAC for Cordless TelephonesTIA UpdatePresented by:Bill BeltSenior Director,Engineering and Technology Policybbelt@tiaonline.org
Who is TIA? • TIA is a leading trade association for the information and communications technology (ICT) industry, with 600 member companies that manufacture or supply the products and services used in global communications. • TIA represents its members on the full range of public policy issues affecting the ICT industry and forges consensus on industry standards. • Among their numerous lines of business, TIA member companies design, produce, and deploy network and terminal equipment. • TIA engineering committees also produce technical standards in response to customers, consumers, and the public safety community. GSC: Standardization Advancing Global Communications
Accessibility at TIA • Sample of Standards Work: • TIA-Hearing Aid Compatibility Standard for Magnetic Coupling, wired and cordless, used by FCC • TTY Tones over VoIP • TTY Tones over Vocoders • Standards for TTY (or Text Telephones aka TDD), ITU Standard • Interference issues to Hearing Aids from Cellular/PCS phones • Interference to Hearing Aids from Digital Cordless Phones • Past TIA Chair of Access Board’s Telecommunications Access Advisory Committee (TAAC) • FCC’s Negotiated Rulemaking on HAC • Work with HLAA, Gallaudet University, others • Outreach and Education • ADA and Sections 255 and 508 Compliance Educational Programs GSC: Standardization Advancing Global Communications
Digital Cordless Informal Complaints (2004) • Forwarded by FCC Consumer and Governmental Affairs Bureau • Received by many TIA member companies engaged in consumer telephone business • Increasing number of complaints beginning in May 2004 time-frame • Concerning 2.4 and 5.8 GHz digital cordless telephones GSC: Standardization Advancing Global Communications
Cordless vs. Wireless • A cordless handset makes a wireline connection to the public switched telephone network (PSTN) via a radio frequency (RF) link to a base unit that is typically less than 100 feet away. • A wireless device makes an air interface connection to the wireless communications network via an RF link to a cell site that is frequently more than a mile away. GSC: Standardization Advancing Global Communications
Cordless vs. Wireless • Cordless handsets are less likely to cause RF interference because they emit less RF power. • All cordless handsets provide magnetic coupling to T-coils; not all wireless handsets do. • For cordless phones, magnetic interference is the primary source of interference with hearing aids • For cellular phones, radio frequency (RF) interference and magnetic interference are both sources of interference with hearing aids GSC: Standardization Advancing Global Communications
Cordless vs. Wireless • Cordless operating frequencies • 900 MHz • 2.4 GHz • 5.8 GHz • Wireless (cellular/PCS) operating frequencies • 800 MHz • 1900 MHz GSC: Standardization Advancing Global Communications
Cordless Phones – The Problem • The primary source of the magnetic interference is the switching of power circuits in the handset, particularly turning the RF transmitter on and off and refreshing LCD displays. GSC: Standardization Advancing Global Communications
Cordless Industry Response • Formation of Cordless HAC Working Group and involvement of TIA Engineering Committee TR-41 to specify solutions • Held initial meeting on June 28, 2004. • Focused on • Understanding complaint issues • Investigating possible testing program • Outreach to disability groups • Outreach to FCC GSC: Standardization Advancing Global Communications
Engineering Committee TR-41 Background • Engineering Committee on User Premises Telecommunications Requirements • Sponsored by User Premises Equipment Division (UPED) • Over 20 years involvement in HAC issues • Source of original EIA (RS) 504 HAC standard • Has working group on cordless telephones GSC: Standardization Advancing Global Communications
TR-41 Activities • August 2004 meeting in Washington, DC • Agenda item on informal FCC complaints • Applicability of ANSI C63.19-2001? • Does not cover 2.4 and 5.8 GHz frequency ranges • Several issues identified concerning the repeatability of test results with the initial version of the standard • Presentation and audio demonstration by Linda Kozma-Spytek of Gallaudet University GSC: Standardization Advancing Global Communications
Cordless Industry Initial Response • Encourage people encountering hearing aid interference to use cordless analog sets • Basic sets • High-end sets with speakerphones, answering systems, caller ID, etc. • Manufacturers can continue to offer cordless analog sets - choice not driven by licensed carriers • Concentration on refining undesired magnetic signal measurement methodology and performance criteria GSC: Standardization Advancing Global Communications
Cordless Industry Response • New TR-41.3 Project - June 2005 • Draft TIA-1083 Standard: “Measurement procedures and performance requirements for handset-generated in-band magnetic noise,” • Documents measurement techniques, corded or cordless • Provides a method to evaluate impact to a hearing aid of unwanted noise from a telephone handset • Performance for “desired” magnetic output still specified by TIA-504 Standard and FCC Rules • Estimate 2006 availability of Standard GSC: Standardization Advancing Global Communications
Cordless Industry Response • Goal of TIA-1083: establishment of a method of objectively characterizing the magnetic signal quality produced by cordless handsets and correlating the results with the subjective experiences of people who use hearing aids in order to establish measurable and reproducible performance criteria to include in an industry standard. • Periodic updates to the FCC and Advocacy Groups on progress GSC: Standardization Advancing Global Communications
Summary • Industry and TIA are addressing the issues of Accessibility • Industry is working to solve the issues on a voluntary basis in cooperation with the FCC and advocacy groups • TIA is committed to continued support for Accessibility issues GSC: Standardization Advancing Global Communications