Huawei MC509 Series Hardware Manual page 57

HUAWEI MC509 Series CDMA LGA Module
Hardware Guide

Length of the RUIM interface lines (preferably <10 cm).

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.
Issue 02 (2013-05-06)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Electrical and Reliability Features
57