TIA-1083 Wireline Telephone HAC Performance Requirements With a Comparison to C-63.19 Wireless Telephone HAC Magnetic Performance Requirements

ANSI/TIA-1083-2007 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

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

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.

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.

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 68.316).

Perpendicular Measurement

Transverse Measurement

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

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

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.

2005 SHHH Cordless Study

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: 732 751 1079 Email: swhitesell@vtech.ca