User guide

2524
installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning
the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Wireless Information
The following table summarizes the technical details of the
wireless technology:
Wireless Hearing Aids
Antenna Type Inductive Antenna
Antenna Dimensions Ø1.9 mm, L – 6.5 mm
Modulation PSK (Phase Shift Key)
Magnetic Field Strength
(at 10 m distance)
0.09 A/m (1 cm2 coil; average)
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.
EMI/EMC COMPLIANCE
Wireless hearing aids comply with the following EMC/EMI
standards:
Standard Test Type Note
47 CFR Part 15,
Subpart C
RF emissions U.S. FCC requirements for intentional radiators.
EN 300 330-1/2 RF emissions
including
spurious
emission
EMC and radio spectrum matters for short range
devices in the frequency range 9 kHz – 25 MHz.
IEC 60601-1-2 EMC emission
immunity, RF
and ESD
Medical electrical equipment. General
requirements for basic safety and essential
performance. Electromagnetic compatibility.
EN 301 489-1/3 Immunity, RF
and ESD
Standard for low power transmitters in the
frequency range 9 kHz – 40 GHz.
IEC 60118-13 Immunity
RF near field
immunity test
International product standard for hearing
aids to ensure adequate immunity to radio
interference from mobile telephones.
ANSI C63.19 Immunity
RF near field
immunity test
American National Standard method of
measurement of compatibility between wireless
communication devices and hearing aids.
ANSI/AAMI
PC69:2007
EMC immunity Implantable medical device EMC immunity.
EN 45502-2-1 EMC immunity Particular requirements for pacemakers.
WIRELESS SECURITY MEASURES
Wireless signal security is assured through device system design
that includes:
• A built-in pairing table which specifies valid and legitimate
pairing among units.
• A proprietary Siemens communication protocol which checks
the package numbers during each transmission.
• A Cyclic Redundancy Check (CRC) to check data validity and
correct errors.