FCC Record, Volume 26, No. 19, Pages 14991 to 15893, October 24 - November 10, 2011 Page: 14,993
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* The RF interference level of wireless devices to hearing aids is measured directly. Under the
2007 ANSI Standard, the RF field intensity of a wireless device was measured and then an
adjustment was applied to estimate its potential for hearing aid interference. The new
measurement method, along with the introduction of a Modulation Interference Factor (MIF),
allows testing procedures to be applied to operations over any RF air interface or protocol.'2
* Certain low power transmitters that are unlikely to cause unacceptable RF interference to hearing
aids are exempted from RF emissions testing and are deemed to meet an acceptable M rating.'3
ASC C63" states that the improved tests in the 2011 ANSI Standard "are more correlated to the desired
result." Thus, "[tjhe new test methods are improved at measuring the potential for hearing aid
4. The Commission has recognized that revisions to the ANSI Standard may be necessary
over time to improve hearing aid compatibility technical standards and accommodate technological
advances and that the Commission's rules should evolve to reflect such revisions.'9 In particular, to
ensure that the hearing aid compatibility standard codified in the rules would remain current, the
Commission delegated to the Chief of WTB and the Chief of OET the authority, by notice-and-comment
rulemaking, to approve the use of future versions of the standard that do not raise major compliance
issues.' In addition, the Commission delegated authority to the Chief of WTB and the Chief of OET to
initiate a rulemaking proceeding to adopt future versions of the ANSI Standard that add frequency bands
or air interfaces not covered by previous versions, if the new version does not impose materially greater
obligations than those imposed on services already subject to the hearing aid compatibility rules.'7 Under
Section 20.19(k)( 1), new obligations imposed on manufacturers and Commercial Mobile Radio Service
(CMRS) providers as a result of WTB's and OET's adoption of technical standards for additional
frequency bands and air interfaces shall become effective no less than one year after release of the order
for manufacturers and Tier I carriers"" and no less than 15 months after release for other service
See ASC C63' Supplemental Report, Annex A at ii; 2011 ANSI Standard at 12, 14-15. As a result of the change
to a direct measurement methodology, the 2011 ANSI Standard revision is also able to eliminate certain
conservative assumptions that were incorporated into the 2007 standard. Thus, for example, it will be approximately
2.2 dB easier for a GSM phone to receive an M3 rating under the 2011 version. See ASC C63" Supplemental
Report, Annex A at iv.
SSee 201 I1 ANSI Standard at 12-13- ASC C63" Supplemental Report, Annex A at ii. Such transmitters
automatically receive an M4 rating. Specifically, the exemption applies if( 1 ) the sum of the average antenna input
power and the MIF is less than or equal to + 17 dBm or (2) the peak antenna input power is less than or equal to +23
L ASC C63" Supplemental Report at 3.
See. e, g. Section 68.4(a) of the Commission's Rules Governing Hearing Aid-C(ompatible Telephones, WT
Docket No. 01-309, Report and Orider. 18 FCC Red 16753, 16779 62-63.
'647 C.F.R. t 20.19(k)(2)
17See 47 C.F.R. 20.19(k)( I).
STier 1 carriers are CMRS providers with nationwide ifootprints. See Revision of the Commission's Rules to
Ensure Compatibility with Enhanced 9I 1 , nEmergency Calling Systems: P'hase II Compliance Deadlines for Non-
Nationwide Carriers, CC(' D)ocket No. 94-10)2, Order to Stat,. 17 FCC Red 14841, 14843 1 7 (2002). In contrast. I ier
II carriers are non-nationwide mid-sized C'MRS providers, specifically providers with more than 500.000
subscribers as of the end of 2001, while Tier ill carriers are non-nationwide small CMRS providers with no more
than 500,000 subscribers as of the end of 201(). See id at 14846-48 u1q 19-24.
Federal Communications Commission
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United States. Federal Communications Commission. FCC Record, Volume 26, No. 19, Pages 14991 to 15893, October 24 - November 10, 2011, book, November 2011; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc133013/m1/17/: accessed July 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.