Huawei Comprehensive Guide for EM820W HSPA+ Module
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HUAWEI EM820W HSPA+ PC Embedded Module

 

Hardware Guide

RF Specifications

into account. The appropriate antenna gain prolongs the service life of relevant batteries.

The following antenna gain is recommended for antennas on laptops:

zGain of the master antenna ≤ 3 dBi

zGain of the slave antenna ≤ 3 dBi

zThe antenna on a laptop consists of the antenna body and the relevant RF transmission cable. Take the RF transmission cable inside the laptop into account when measuring any of the preceding antenna indicators.

zHuawei cooperates with various antenna suppliers who are able to make suggestions on antenna design, for example, Amphenol, Skycross, Pulse etc.

4.4.2Interference

Besides the antenna performance, the interference on the user board also affects the radio performance (especially the TIS) of the module. To guarantee high performance of the module, the interference sources on the user board must be properly controlled.

On the user board, there are various interference sources, such as the LCD, CPU, audio circuits, and power supply. All the interference sources emit interference signals that affect the normal operation of the module. For example, the module sensitivity can be decreased due to interference signals. Therefore, during the design, you need to consider how to lessen the effects of interference sources on the module. To lessen the effects of interference sources on the module, you can use an LCD with optimized performance, shield the LCD interference signals, shield the signal cable of the board, or design filter circuits.

Huawei is capable of making technical suggestions on radio performance improvement of the module.

4.4.3 GSM/WCDMA Antenna Requirements

The antenna for EM820W must fulfill the following requirements:

Table 4-5GSM/WCDMA antenna requirements

GSM/WCDMA Antenna Requirements

Frequency range

Depending on the frequency band(s) provided by the network operator, the customer must use the most suitable antenna for that/those band(s)

Issue 01 (2010-12-31)

Huawei Proprietary and Confidential

23

Copyright © Huawei Technologies Co., Ltd.

 

 

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Contents Issue Date Hardware GuideNo Warranty About This Document HistoryVersion Date Chapter Descriptions Contents Electrical and Reliability Features Recommendations for Designing the Module AntennasTables Figures Introduction OverviewAbout This Chapter Feature DescriptionOverall Description Function OverviewCircuit Block Diagram SMSApplication Block Diagram 1Circuit block diagram of the EM820W moduleDescription of the Application Interfaces Mini PCI Express InterfaceVCC3V3 UimresetWDISABLE# Wdisablen COEX1Active-low LED signal Output Indicating the state Card USB signal D Input/outputUSB signal D+ Input/output Mini Card ground Not connectedName Pins Minimum Type Maximum Power Sources and GroundsPower Supply Time Sequence VCCTimeNominal value Unit USB SignalsParameter Remarks Name Pin Description Direction to ModulePin Name Description Usim SignalsUsim Interface Schematic Reference UIM/SIMDesign Guide 7Vcc SIM CLK requirements Minimum Maximum2Vcc 7VccVcc Certification Test8SIM IO requirements Vcc Vcc+0.3Pins Name Description Direction to Module WDISABLE# SignalLEDWWAN# Signal SW Control Setting Radio OperationLedwwan 11LEDWWAN signalPins Name Description Additional Direction to Module IF*R+VF+IF*100 =VCCWakenbn Signal NC PinsNC pins are not internally connected in the EM820W Conducted RF Measurement RF SpecificationsOperating Frequencies Test EnvironmentConducted Receive Sensitivity Conducted Rx Sensitivity and Tx PowerTest Standards EM820W Test Value dBmConducted Transmit Power 3GPP Protocol EM820W Test Value dBm Claim dBm Min Type MaxAntenna Design Indicators Antenna Design RequirementsDCS UMTS850UMTS900 PCSEnvelope Correlation Coefficient Interference 3 GSM/WCDMA Antenna RequirementsGSM/WCDMA Antenna Requirements Radio Test Environment Passive TestsDesign Recommendations Recommendations for Designing the Module AntennasESD Protection for the Antenna Interface Issue 01 Huawei Proprietary and Confidential Electrical and Reliability Features Working and Storage Temperatures and HumidityExtreme Working Conditions Specification Minimum Value Maximum Value Unit Electrical Criteria of Application InterfacesParameter Description Minimum Value Power Consumption Power Supply FeaturesPower Supply Power Voltage Tolerance Peak Maximum Normal MaximumHsupa ConfigurationHsdpa Description Test Value UnitsEDGE850 225 Up/1 DownGPRS900 250 Up/1 Down 351 488 165 217 293Reliability Features Scenario Idle Suspend Unit Offline Enabled DisabledTest Condition Standard Test Condition Standard EMC and ESD Features Dimensions of the Mini PCI Express Connector Mechanical SpecificationsDimensions and Interfaces Dimensions and Interfaces of EM820WSpecification Selection for Fasteners Installing the EM820W on the Main Board of PCIssue 01 Huawei Proprietary and Confidential Romoving the EM820W from the Main Board of PC Appendix a Circuits of Typical Interfaces 1Circuits of typical interfaces in the EM820W moduleAppendix B Acronyms and Abbreviations Acronym or Abbreviation ExpansionPCB NTCPbcch PDU

EM820W specifications

The Huawei EM820W is a cutting-edge mobile broadband device that exemplifies Huawei's commitment to innovation and excellence in the telecommunications sector. Designed for seamless connectivity, the EM820W caters primarily to users who demand high-speed data access while on the move.

One of the standout features of the Huawei EM820W is its support for high-speed 4G LTE connectivity. With download speeds that can reach up to 150 Mbps and upload speeds of up to 50 Mbps, users can enjoy smooth streaming, rapid downloads, and responsive online gaming experiences. This capability makes the device an ideal choice for both individual users and business professionals who rely on robust internet access.

The EM820W is equipped with a compact and lightweight design, making it highly portable. This device can be easily carried in a pocket or bag, allowing users to stay connected wherever they go. Its plug-and-play feature simplifies the setup process, ensuring that even those who are not tech-savvy can easily get online.

Another notable aspect of the Huawei EM820W is its compatibility with a wide range of operating systems, including Windows, macOS, and various distributions of Linux. This versatility means that users can connect the device to their preferred platforms without facing compatibility issues, enhancing the overall user experience.

The device also incorporates advanced security features to safeguard user data, including built-in encryption protocols. This is particularly important for business users who require secure connections for sensitive transactions and communications.

In addition to its connectivity capabilities, the EM820W showcases energy-efficient technologies that optimize battery performance. The device is designed to consume minimal power, allowing users to prolong usage times without frequently recharging.

The Huawei EM820W comes with a user-friendly interface, enabling users to easily manage their connections and monitor data usage. This feature is valuable for those who need to track their internet consumption to avoid exceeding data limits imposed by service providers.

With its blend of speed, portability, and user-oriented features, the Huawei EM820W stands out as a reliable solution for those seeking robust mobile broadband capabilities. Whether for personal use or professional needs, this device ensures that users remain connected in an increasingly digital world.
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