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Hardware Guide
Electrical and Reliability Features
Issue 01 (2011-04-08)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
54
5.7 EMC and ESD Features
EMC tests have to be performed on the application as soon as possible to detect any
potential problems.
When designing, special attention should be paid to the following:
Possible harmful emissions radiated by the application to the RF receiver in the
receiver band.
ESD protection is mandatory on all signals which are externally accessible
Typically, ESD protection is mandatory for the following:
− UIM (if accessible from outside)
− Serial link
− USB
− Audio
Length of the UIM interface lines (preferably <10cm).
EMC protection on audio input/output (filters against 900MHz emissions).
Biasing of the microphone inputs.
Ground plane: HUAWEI Wireless recommends a common ground plane for
analog/digital/RF grounds.
A metallic case or plastic casing with conductive paint is recommended, except
for the area around the antenna.
The HUAWEI MC509 Module does not include any protection against over voltage.