Lg D520 User Manual download pdf (Page 137)

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generate less interference to hearing devices than phones that are not labeled.

T4 is the better/higher of the two ratings.

Hearing devices may also be rated. 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 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’s 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.

When you're talking on a cell phone, it's recommended that you turn the BT

(Bluetooth) or WLAN mode off for HAC.

For information about hearing aids and digital wireless phones

Wireless Phones and Hearing Aid Accessibility

http://www.accesswireless.org/Home.aspx

FCC Hearing Aid Compatibility and Volume Control

http://www.fcc.gov/cgb/consumerfacts/hac_wireless.html

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Lg D520 User Manual Page 137