Huawei MU739 Hardware Manual page 57

HUAWEI MU739 HSPA+ LGA Module
Hardware Guide
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Length of the USIM interface lines (preferably <10 cm).
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EMC protection on audio input/output (filters against 900MHz emissions).
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Biasing of the microphone inputs.
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Ground plane: HUAWEI Wireless recommends a common ground plane for
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analog/digital/RF grounds.
A metallic case or plastic casing with conductive paint is recommended, except
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for the area around the antenna.
The HUAWEI MU739 Module does not include any protection against over voltage.
Issue 01 (2011-08-24)
USIM (if accessible from outside)
Serial link
USB
Audio
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Electrical and Reliability Features
57