HTC Sprint Touch Pro2 Manual page 227

be vulnerable to interference, you may not be able to use a rated phone successfully. Trying
out the phone with your hearing device is the best way to evaluate it for your personal needs.
M-Ratings: Phones rated M3 or M4 meet FCC requirements and are likely to generate less
interference to hearing devices than phones that are not rated. M4 is the better/higher of the
two ratings.
T-Ratings: Phones rated T3 or T4 meet FCC requirements and are likely to be more usable
with a hearing aid's telecoil than phones that are not rated. T4 is the better/higher of the two
ratings.
RHOD400 complies with the FCC's requirements for hearing aid compatibility when using
the CDMA air interface. The M rating in this mode is M4 and the T rating in this mode is T3.
Your hearing device manufacturer or hearing health professional may help you find this
rating. Higher ratings mean that the hearing device is relatively immune to interference noise.
The hearing aid and wireless phone rating values are then added together. A sum of 5 is
considered acceptable for normal use. A sum of 6 is considered for better use. A sum of 8 is
considered for best use.
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 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.
This methodology applies equally for T ratings. 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. 1 9 of the FCC Rules. The HAC rating and
4A. Important Safety Information 221