Wireless Information - Siemens Nitro User Manual

Wireless Information

The following table summarizes the technical details of the
wireless technology:
Antenna Type Inductive Antenna
Antenna Dimensions Ø1.9 mm, L – 6.5 mm
Modulation PSK (Phase Shift Key)
Magnetic Field Strength 0.09 A/m (1 cm2 coil; average)
(at 10 m distance)
Output Power (EIRP**) 42 µW
Range <1 m remote to hearing aid
<30 cm between aids or aid to remote
Center Frequency 3.28 MHz
Channel Single Channel Radio
Bandwidth 67 kHz
Data-Rate 655 kbit/sec (raw channel capacity)
Data Flow Simplex or semi-duplex capability
Protocol Random access – no collision avoidance
S.A.R.* 5 nW/kg (BTE), 13 nW/kg (ITE)
* Specific Absorption Rating (S.A.R.) for continuous transmission
(100% duty cycle) based on 10g ICNIRP testing.
26
Wireless Hearing Aids
EMI/EMC COMPLIANCE
Wireless hearing aids comply with the following EMC/EMI
standards:
Standard Test Type
47 CFR Part 15, RF emissions
Subpart C
EN 300 330-1/2 RF emissions
including
spurious emission
IEC 60601-1-2 EMC emission
immunity, RF and
ESD
EN 301 489-1/3 Immunity, RF and
ESD
IEC 60118-13 Immunity RF near
field immunity
test
ANSI C63.19 Immunity RF near
field immunity
test
ANSI/AAMI EMC immunity
PC69:2007
EN 45502-2-1 EMC immunity
Note
U.S. FCC requirements for
intentional radiators.
EMC and radio spectrum matters for
short range devices in the frequency
range 9 kHz – 25 MHz.
Medical electrical equipment.
General requirements for basic
safety and essential performance.
Electromagnetic compatibility.
Standard for low power transmitters
in the frequency range 9 kHz – 40
GHz.
International product standard for
hearing aids to ensure adequate
immunity to radio interference from
mobile telephones.
American National Standard method
of measurement of compatibility
between wireless communication
devices and hearing aids.
Implantable medical device EMC
immunity.
Particular requirements for
pacemakers.
27