Health and Safety Information 84
In the above example, if a hearing aid meets the M2
level rating and the wireless phone meets the M3
level rating, the sum of the two values equal M5. This
is synonymous for T ratings. This should provide the
hearing aid user with "normal usage" while using
their hearing aid with the particular wireless phone.
"Normal usage" in this context is defined as a signal
quality that is acceptable for normal operation.
The M mark is intended to be synonymous with the U
mark. The T mark is intended to be synonymous with
the UT mark. The M and T marks are recommended
by the Alliance for Telecommunications Industries
Solutions (ATIS). The U and UT marks are referenced
in Section 20.19 of the FCC Rules.
The HAC rating and measurement procedure are
described in the American National Standards
Institute (ANSI) C63.19 standard.
Other Medical Devices
If you use any other personal medical devices,
consult the manufacturer of your device to determine
if it is adequately shielded from external RF energy.
Your physician may be able to assist you in obtaining
this information. Switch your phone off in health care
facilities when any regulations posted in these areas
instruct you to do so. Hospitals or health care
facilities may be using equipment that could be
sensitive to external RF energy.
Vehicles
RF signals may affect improperly installed or
inadequately shielded electronic systems in motor
vehicles. Check with the manufacturer or its
representative regarding your vehicle. You should
also consult the manufacturer of any equipment that
has been added to your vehicle.
Posted Facilities
Switch your phone off in any facility where posted
notices require you to do so.
Potentially Explosive Environments
Switch your phone off when in any area with a
potentially explosive atmosphere and obey all signs
and instructions. Sparks in such areas could cause
an explosion or fire resulting in bodily injury or even
death.
Users are advised to switch the phone off while at a
refueling point (service station). Users are reminded
of the need to observe restrictions on the use of radio
equipment in fuel depots (fuel storage and
distribution areas), chemical plants or where blasting
operations are in progress.
Areas with a potentially explosive atmosphere are
often but not always clearly marked. They include
below deck on boats, chemical transfer or storage
facilities, vehicles using liquefied petroleum gas
(such as propane or butane), areas where the air
contains chemicals or particles, such as grain, dust
or metal powders, and any other area where you
would normally be advised to turn off your vehicle
engine.
Common Cents M340.book Page 84 Thursday, April 1, 2010 12:36 PM