tia-1083 wireline telephone hac performance requirements with a comparison to c-63.19 wireless...
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TIA-1083 Wireline TelephoneHAC Performance Requirements
With a Comparison toC-63.19 Wireless Telephone
HAC Magnetic Performance Requirements
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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
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Overview Addresses magnetic interference issues
identified by hearing aid users. RF interference does not appear to be a
significant issue for cordless telephones.
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Requirements Summary Signal Sensitivity:
-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.
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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.
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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).
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Perpendicular Measurement
Measurement Plane
Handset Side Profile
PerpendicularProbe
locationexample
10mm
10mm
ApplicablePerpendicularMeasurementPosition Area
ReferenceAxis
Width ofHandsetHandset Front Profile
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Transverse Measurement
Measurement Plane
Handset Side Profile
Transverse Probelocation example
10mm
10mm
ApplicableTransverse
MeasurementPosition Area
ReferenceAxis
Width ofHandsetHandset Front Profile
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2005 SHHH Cordless StudyT-Coil Interference Avg Score vs Noise (dBA/m)
-1
0
1
2
3
4
5
1 2 3 4 5 6 7 8 9
Sample
Av
g S
co
re
-72
-62
-52
-42
-32
-22
-12
No
ise
(dB
A/m
)
Avg Score
dBA/m
Unbearable
Very Annoying
Annoying
Mildly Annoying
Not Annoying
No Interference
Figure C.3 from TIA-1083
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2006 HLAA Parametric Study
Figure D.3 from TIA-1083
Minimum S/N for a "Normal Use" Rating
0
10
20
30
40
50
0% 20% 40% 60% 80% 100%
subjects meeting criteria
S/N
- d
B DSSS
FHSS
Display
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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.
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2005 SHHH Cordless Study
T-Coil and Microphone Interference Avg Score
-1
0
1
2
3
4
5
1 2 3 4 5 6 7 8 9
Sample
Av
g S
co
re
Avg Score
Mic Avg
Unbearable
Very Annoying
Annoying
Mildly Annoying
Not Annoying
No Interference
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Contact Information
Stephen R WhitesellTIA Representative to C63Chair, TIA TR-41Senior Technical ConsultantStandards, Regulatory and Intellectual Property MattersVTech CommunicationsTel: 732 751 1079Email: [email protected]