1. TIA-1083 Wireline Telephone HAC Performance Requirements
With a Comparison to C Wireless Telephone HAC Magnetic Performance Requirements

2. ANSI/TIA
Telecommunications – Telephone Terminal Equipment – Handset Magnetic Measurement Procedures and Performance Requirements
Approved March 21, 2007
Developed by TIA TR-41.3, Analog and Digital Wireline Terminals

3. Overview
Addresses magnetic interference issues identified by hearing aid users.
RF interference does not appear to be a significant issue for cordless telephones.

4. Requirements Summary Signal Sensitivity: Harmonic Distortion:
 -22 dB (A/m) at 1000 Hz, Perpendicular
 -27 dB (A/m) at 1000 Hz, Transverse
Same as Part 68, but greater latitude allowed in measurement location.
Harmonic Distortion:
 10%, Perpendicular and Transverse
Frequency Response:
Same as Part 68 and C63.19, Perpendicular.

5. Requirements Summary (cont)
A-Weighted Noise:
 -40 dB (A/m), Perpendicular and Transverse
Measured same as in C63.19 using half-band integrator.
Signal-to-Noise Ratio:
 45 dB, Perpendicular and Transverse
Approximately equivalent to 30 dB requirement for C63.19.

6. Requirements Summary (cont)
Signal-to-Noise Ratio (cont)
Noise is measured same way for both standards.
Signal in C63.19 represents “nominal level speech input” (see Footnote 45).
Signal in TIA-1083 is same as in Part 68 and is “approximately 15 dB above the average level” (see paragraph 2.4 in EIA RS-504 as reproduced in 47 CFR ).

7. Perpendicular Measurement

8. Transverse Measurement

9. 2005 SHHH Cordless Study
Figure C.3 from TIA-1083

10. 2006 HLAA Parametric Study
Figure D.3 from TIA-1083

11. RF Interference ??
Informal FCC Complaints received by cordless telephone manufacturers were from T-coil users.
RF power level typically 200 mW.
2005 SHHH Cordless Study included 27 people who used T-coil coupling and 5 who used acoustic coupling to the microphone.

12. 2005 SHHH Cordless Study

13. Contact Information
Stephen R Whitesell TIA Representative to C63 Chair, TIA TR-41 Senior Technical Consultant Standards, Regulatory and Intellectual Property Matters VTech Communications Tel: