Sierra Wireless EM8781 850/900/1800/1900/2100 MHz Multi-band Module User Manual

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EM8781 User Manual HTML Version

User Manual

2130851

Rev 1.0

GSM Embedded Modules

Hardware Integration Guide

Proprietary and Confidential

EM8780/

EM8781

Preface

Rev 1.0 Apr.07 3

Limitation of

Liability

Theinformationinthismanualissubjecttochangewithout

noticeanddoesnotrepresentacommitmentonthepartof

SierraWireless.SIERRAWIRELESSANDITSAFFILIATES

SPECIFICALLYDISCLAIMLIABILITYFORANYANDALL

DIRECT,INDIRECT,SPECIAL,GENERAL,INCIDENTAL,

CONSEQUENTIAL,PUNITIVEOREXEMPLARYDAMAGES

INCLUDING,BUTNOTLIMITEDTO,LOSSOFPROFITSOR

REVENUEORANTICIPATEDPROFITSORREVENUE

ARISINGOUTOFTHEUSEORINABILITYTOUSEANY

SIERRAWIRELESSPRODUCT,EVENIFSIERRAWIRELESS

AND/ORITSAFFILIATESHASBEENADVISEDOFTHE

POSSIBILITYOFSUCHDAMAGESORTHEYARE

FORESEEABLEORFORCLAIMSBYANYTHIRDPARTY.

Notwithstandingtheforegoing,innoeventshallSierra

Wirelessand/oritsaffiliatesaggregateliabilityarisingunderor

inconnectionwiththeSierraWirelessproduct,regardlessof

thenumberofevents,occurrences,orclaimsgivingriseto

liability,beinexcessofthepricepaidbythepurchaserforthe

SierraWirelessproduct.

Patents Portionsofthisproductmaybecoveredbysomeorallofthe

followingUSpatents:

5,515,013 5,629,960 5,845,216 5,847,553 5,878,234

5,890,057 5,929,815 6,169,884 6,191,741 6,199,168

6,339,405 6,359,591 6,400,336 6,516,204 6,561,851

6,643,501 6,653,979 6,697,030 6,785,830 6,845,249

6,847,830 6,876,697 6,879,585 6,886,049 6,968,171

6,985,757 7,023,878 7,053,843 7,106,569 D442,170

D459,303

andotherpatentspending.

Thisproductincludes

technologylicensedfrom:

LicensedbyQUALCOMMIncorporatedunderoneormoreof

thefollowingUnitedStatespatentsand/ortheircounterparts

inothernations:

4,901,307 5,056,109 5,101,501 5,109,390 5,228,054

5,267,261 5,267,262 5,337,338 5,414,796 5,416,797

5,490,165 5,504,773 5,506,865 5,511,073 5,535,239

5,544,196 5,568,483 5,600,754 5,657,420 5,659,569

5,710,784 5,778,338

ManufacturedorsoldbySierraWirelessoritslicenseesunder

oneormorepatentslicensedfromInterDigitalGroup.

GSM Embedded Modems Hardware Integration Guide

42130851

Trademarks AirCardand“HeartoftheWirelessMachine”areregistered

trademarksofSierraWireless.

SierraWireless,theSierraWirelesslogo,theredwavedesign,

andWatcheraretrademarksofSierraWireless.

Windows®isaregisteredtrademarkofMicrosoftCorporation.

QUALCOMM®isaregisteredtrademarkofQUALCOMM

Incorporated.Usedunderlicense.

Othertrademarksarethepropertyoftherespectiveowners.

Contact

Information

Consultourwebsiteforup‐to‐dateproductdescriptions,

documentation,applicationnotes,firmwareupgrades,trouble‐

shootingtips,andpressreleases:

www.sierrawireless.com

Sales Desk: Phone: 1-604-232-1488

Hours: 8:00 AM to 5:00 PM Pacific Time

E-mail: sales@sierrawireless.com

Post: Sierra Wireless

13811 Wireless Way

Richmond, BC

Canada V6V 3A4

Fax: 1-604-231-1109

Web: www.sierrawireless.com

Rev 1.0 Apr.07 5

Table of Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

The Lab Adapter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Required connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Guide organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Related documents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Power Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Overview of operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Power signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Electrostatic discharge (ESD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Module power states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Off state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Normal state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Low power mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Usage models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

RF Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

RF connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Ground connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Shielding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Antenna and cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Interference and sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Power supply noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Interference from other wireless devices . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Device-generated RF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Regulatory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Important notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

GSM Embedded Modems Hardware Integration Guide

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Safety and hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Important compliance information for North American users . . . . . . . . . . . 22

Acronyms and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Rev 1.0 Apr.07 7

1: Introduction

SierraWireless’embeddedmodulesformtheradiocomponent

fortheproductsinwhichtheyareembedded.Theembedded

modulesareavailableforuseonGSMnetworks,andinclude

theseproducts:

Note: Throughout this

document, EM878x refer to the

entire suite of GSM embedded

modules.

•EM8780andEM8781—operate onGSMnetworksusingthe

GSM/GPRS/EDGE/UMTS/HSDPAnetworkstandards

Purpose of this guide

ThisguideaddressesissuesthataffecttheintegrationofSierra

Wirelessmodulesintohostproducts,andincludesdesign

recommendationsforthehostproducts.

Note: An understanding of network technology and experience in

integrating hardware components into electronic equipment is

assumed.

The Lab Adapter Board

SierraWirelessmanufacturesaLabAdapterBoardthatfacili‐

tatesallphasesoftheintegrationprocess.

TheLabAdapterBoardisahardwaredevelopmentplatform

thatisdesignedtosupportmultiplemembersoftheWireless

EmbeddedModuleproductfamily.Itcontainsthehardware

componentsthataretypicallynecessaryforevaluatingand

developingwiththemodule,including:

•LabAdapterBoard

•Cables

•Antennas

•Otheraccessories

Required connectors

Note: Contact the vendors

before you choose your

connectors — the numbers

included here are for reference

only. Choose connectors that are

appropriate to your design.

Whenintegratingthesemodulesintoyourhostdevice,you

needthefollowingconnectortypes:

•RFcablethatmateswithIPEXMHF‐A13connector(model

20428‐001R)

•IPEX15pinCABLINEcableconnector(partnumber

20347‐015E‐01).

•Industry‐standardUSIM/RUIMconnector—theactual

connectoryouusedependsonhowyourdeviceexposesthe

GSM Embedded Modems Hardware Integration Guide

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USIM/RUIMsocket.Forexample,theUSIM/RUIM

connectorusedontheLabAdapterBoardisanITT

CCM03‐3518.

Guide organization

Thisguideincludesthefollowingsections:

1. Introduction(thissection)

2. Power Interface(page11)

Describespowercontrolsignalsusedbythemoduleand

discussesdesignissuesrelatedtopowersupply

integration.

3. RF Integration(page15)

Describesantennaconnectionmethodsandgroundingissues,

RFinterferenceanddesenseissues.

4. Regulatory Information(page21)

Describesregulatoryapprovalsandregulatoryinformation

requirements.

5. Acronyms and Definitions(page23)

Listsacronymsanddefinitionsusedthroughoutthisguide.

6. Index(page101)

Note: The term "host" always refers to the host device.

Introduction

Rev 1.0 Apr.07 9

Related documents

Thisguidedealsspecificallywithhardwareintegrationissues

thatareuniquetotheEM878xmodules.

Table1‐1listsotherdocumentsreferencedinthisguide.

Table 1-1: Related documentation

Document title Description

AT Command Set for User

Equipment (UE) (Release 6) This 3GPP technical specification describes standard AT

commands for GSM / UMTS devices.

Download this document (3GPP TS 27.007) from

www.3gpp.org.

FCC Regulations - Part 15 -

Radio Frequency Devices This section of the FCC Code of Federal Regulations, Title

47 deals with radio frequency devices, including shielding

requirements for embedded modules.

Download this regulation from http://wireless.fcc.gov.

IEC-61000-4-2 level 3 Techniques for testing and measuring electrostatic

discharge (ESD) immunity.

Order this document from www.iec.ch.

EM8780/EM8781 Product

Specification (Document

2130TBD)

Features, mechanical and electrical specifications, and

standards compliance of the EM8780 / EM8781.

MC87xx Modem CnS Reference

(Document 2130602) This document describes the CnS (Control and Status)

messages supported by the EM8780/EM8781.

MC87xx Modem Extended AT

Command Reference

(Document 2130616)

Proprietary AT commands for the EM878x.

Mobile Station (MS)

Conformance Specification;

Part 4: Subscriber Interface

Module

This 3GPP technical specification describes SIM testing

methods.

Download this document (3GPP TS 11.10-4) from

www.3gpp.org.

UMTS Modems Supported AT

Command Reference

(Document 2130617)

This document describes proprietary, basic AT commands

for the EM878x.

Universal Serial Bus

Specification, Rev 2.0 Download this specification from www.usb.org.

GSM Embedded Modems Hardware Integration Guide

10 2130851

Rev 1.0 Apr.07 11

Values in this guide are summarized from the product specification documents (PSDs) - the PSD takes precedence.

2: Power Interface

Overview of operation

Themoduleisdesignedtousea5.0V(nominal)powersupply,

providedbythehost.Itisthehost’sresponsibilitytoprovide

safeandcontinuouspowertothemoduleatalltimes;the

moduledoesNOThaveanindependentpowersupply,or

protectioncircuitstoguardagainstelectricalissues.

Themodule’spowerstateiscontrolledbythehost’ssupplyof

the5.0Vpowerrail.Whenthisrailispoweredup,themodem

isintheONstate.Whenthisrailispowereddown,the

modemisintheOFFstate.

Power signals

Themodulemustbeconnectedtoa5.0Vpowersupply.

Fordetailedpinoutandvoltage/currentrequirementsofthese

modules,seetheProductSpecificationDocumentforyour

embeddedmodule.

Electrostatic discharge (ESD)

Youareresponsibleforensuringthatthehosthasadequate

ESDprotectionondigitalcircuitsandantennaports:

•(Operational)RFport(antennalaunchandRFconnector):

IEC‐61000‐4‐2—Level(ElectrostaticDischargeImmunityTest)

•(Non‐operational)Hostconnectorinterface:

JESD22‐A114‐B+/‐1kVHumanBodyModeland

JESD22‐C101+/‐125VChargedDeviceModel

Specificrecommendationsareprovidedwhereneededinthis

guide;however,thelevelofprotectionrequireddependson

yourapplication.

Note: ESD protection is highly recommended for the USIM / RUIM

connector at the point where the contacts are exposed, and for any

other signals from the host interface that would be subjected to ESD

by the user of the product.

GSM Embedded Modems Hardware Integration Guide

12 2130851

Values in this guide are summarized from the product specification documents (PSDs) - the PSD takes precedence.

Module power states

Note: The module unit defaults

to the Normal state when 5.0V is

first applied.

Themodulehasthreepowerstates:

•Off

Nopowertothemodule.

•Normal

Powerissuppliedtothemodule.Themoduleisactive.

Severalmodesarepossible(Receive,Transmit,Sleep,

Shutdown).

•Low power (“airplane mode”)

Powerissuppliedtothemodule.Themoduleisactive,but

RFisdisabled.

Astatemachineisimplementedinthemoduletomonitorthe

operatingtemperature.

Off state

Thisstateoccurswhenthereisnopowertothemodule—the

hostpowersourceisdisconnectedfromthemodule,andall

voltagesassociatedwiththemoduleareat0V.

Whetherthehostdeviceisalsopoweredoffdependsonthe

powerraildesign.Iftheconnectionbetweenthepowerrail

andthemoduleiscontrolledbythehost,thehostcanstay

poweredonandcutthepowertoputthemodemintothe

disconnectedstate.Ifthepowerrailissharedbetweenthehost

deviceandthemodule,thehostispoweredoffwhenthe

moduleispoweredoff.

Normal state

Note: This is the default state

when 5.0V is first applied.

Thisistheactivestateofthemodule.Inthisstate:

•Themoduleisfullypowered.

•Themoduleiscapableofplacing/receivingcallsorestab‐

lishingdataconnectionsonthewirelessnetwork.

•TheUSBinterfaceisfullyactive.

Low power mode

Inthisstate,RF(bothRxandTx)isdisabledinthemodule,but

theUSBinterfaceisstillactive.Thislowpowermode

(ʺairplanemodeʺ)iscontrolledbysoftwarecommands

throughthehostinterface.

Forinstructionsonusingthecommands,referto:

•ATCommandSetforUserEquipment(UE)(Release6)

(+CFUN=0command),

Power Interface

Rev 1.0 Apr.07 13

Values in this guide are summarized from the product specification documents (PSDs) - the PSD takes precedence.

•MC87xxModemCnSReference(Document2130602)(Disable

Modemcommand).

Usage models

Usagemodelscanbeusedtocalculateexpectedcurrent

consumption.AsampleusagemodelisprovidedinTable2‐1.

Thisexamplemodelappliestoabattery‐operateddevice.In

practice,becausethemoduleisisolatedfromthebattery(the

hostdevicemanagesthepowersource),themAhratings

dependonthedevice’ssupplyefficiency.

Themoduleautomaticallyentersslottedsleepmodewhen

thereisnotransmissionorreceptionoccurring(SCI=2).

Transmitpowerisassumedtobe+3dBm.

Table 2-1: Power consumption of a sample application

Used by a field worker

(data only) Used for remote data

logging

Upload

(module Tx) 1000 kB/day 40 kB/h

Download

(module Rx) 500 kB/day 100 kB/day

Coverage / data

rate 1X / 80 kbps IS-95 / 14.4 kbps

Hours of

operation 8 / day (off 16 hrs / day) 24 / day

Total power

consumed over

24 hours

66 mAh 220 mAh

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3: RF Integration

TheEM878xoperatesonthefrequenciesdetailedinTable3‐1.

RF connection

Whenattachinganantennatothemodule:

Note: To disconnect the

antenna, make sure you use the

IPEX MHF connector removal

tool (P/N TBD) to prevent

damage to the module or coaxial

cable assembly.

•UseanIPEXMHFconnector(modelMHFA13‐7G‐113‐60‐

SW)toattachanantennatoaconnectionpointonthe

module,asshowninFigure3‐1below.

•Matchcoaxialconnectionsbetweenthemoduleandthe

antennato50Ω.

•MinimizeRFcablelossestotheantenna;therecommended

maximumcablelossforantennacablingis0.5dB.

Table 3-1: EM878x — Supported frequencies

Band Frequencies

(MHz)

GSM 850 Tx: 824–849

Rx: 869-894

EGSM 900 Tx: 880-915

Rx: 925-960

DCS 1800 Tx: 1710-1785

Rx: 1805-1880

PCS 1900 Tx: 1850-1910

Rx: 1930-1990

Band I

UMTS 2100 Tx: 1920–1980

Rx: 2110–2170

Band II

UMTS 1900 Tx: 1850–1910

Rx: 1930–1990

Band V

UMTS 850 Tx: 824–849

Rx: 869–894

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In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.

Figure 3-1: Antenna connection points and mounting tabs/clip

Ground connection

Whenconnectingthemoduletosystemground:

•Preventnoiseleakagebyestablishingaverygoodground

connectiontothemodulethroughthehostconnector.

•Connecttosystemgroundusingthemountingtabsatthe

topandbottomofthemodule(asshowninFigure3‐1on

page16).

•MinimizegroundnoiseleakageintotheRF.

Dependingonthehostboarddesign,noisecouldpotentially

becoupledtothemodulefromthehostboard.Thisis

mainlyanissueforhostdesignsthathavesignalstraveling

alongthelengthofthemodule,orcircuitryoperatingat

bothendsofthemoduleinterconnects.

Shielding

ThemoduleisfullyshieldedtoprotectagainstEMIandto

ensurecompliancewithFCCPart15‐“RadioFrequency

Devices”(orequivalentregulationsinotherjurisdictions).

Note: The module shields must NOT be removed.

EM8780/8781:

GPS connector

Diversity RF connector

Main RF connector

Mounting tabs/clip

RF Integration

Rev 1.0 Apr.07 17

Values in this guide are summarized from the product specification documents (PSDs) - the PSD takes precedence.

Antenna and cabling

Note: Values in this guide are

taken from the appropriate

product specification documents

(PSDs) (listed in

documents

, page 9). In the case

of a discrepancy between this

document and the relevant PSD,

use the value listed in the PSD.

Whenselectingtheantennaandcable,itiscriticaltoRFperfor‐

mancetomatchantennagainandcableloss.

Choosing the correct antenna and cabling

Considerthefollowingpointsforpropermatchingofantennas

andcabling:

•Theantenna(andassociatedcircuitry)shouldhavea

nominalimpedanceof50Ωwithareturnloss≤ 10dB

acrosseachfrequencybandofoperation.

•Thesystemgainvalueaffectsbothradiatedpowerand

regulatory(FCC,IC,CE,etc.)testresults.

Developing custom antennas

Considerthefollowingpointswhendevelopingcustom‐

designedantennas:

•AskilledRFengineershoulddothedevelopmenttoensure

thattheRFperformanceismaintained.

•Identifythebandsthatneedtobesupported.

Determining the antenna’s location

Considerthefollowingpointswhendecidingwheretoputthe

antenna:

•AntennalocationmayaffectRFperformance.Althoughthe

moduleisshieldedtopreventinterferenceinmostapplica‐

tions,theplacementoftheantennaisstillveryimportant—

ifthehostdeviceisinsufficientlyshielded,highlevelsof

broadbandorspuriousnoisecandegradethemodule’s

performance.

•Connectingcablesbetweenthemoduleandtheantenna

musthave50Ωimpedance.Iftheimpedanceofthemodule

ismismatched,RFperformanceisreducedsignificantly.

•Antennacablesshouldberouted,ifpossible,awayfrom

noisesources(switchingpowersupplies,LCDassemblies,

etc.).Ifthecablesarenearthenoisesources,thenoisemay

becoupledintotheRFcableandintotheantenna.

Disabling the diversity antenna

Ifyourhostdeviceisnotdesignedtousethemodule’s

diversityantenna,terminatetheinterfacewitha50Ω ohm

load.

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In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.

Interference and sensitivity

Note: These modules are based

on ZIF (Zero Intermediate

Frequency) technologies; when

performing EMC

(Electromagnetic Compatibility)

tests, there are no IF

(Intermediate Frequency)

components from the module to

consider.

SeveralsourcesofinterferencecanaffecttheRFperformance

ofthemodule(RFdesense).Commonsourcesincludepower

supplynoiseanddevice‐generatedRF.

RFdesensecanbeaddressedthroughacombinationof

mitigationtechniquesandradiatedsensitivitymeasurement.

Power supply noise

NoiseinthepowersupplycanleadtonoiseintheRFsignal.

Note: Values in this guide are

taken from the appropriate

product specification documents

(PSDs) (listed in

documents

, page 9). In the case

of a discrepancy between this

document and the relevant PSD,

use the value listed in the PSD.

Thepowersupplyripplelimitforthemoduleisnomorethan

200mVp‐p1Hzto100kHz.Thislimitincludesvoltageripple

duetotransmitterburstactivity.

Interference from other wireless devices

Wirelessdevicesoperatinginsidethehostdevicecancause

interferencethataffectsthemodule.

Todeterminethemostsuitablelocationsforantennasonyour

hostdevice,evaluateeachwirelessdevice’sradiosystem,

consideringthefollowing:

•Anyharmonics,sub‐harmonics,orcross‐productsofsignals

generatedbywirelessdevicesthatfallinthemodule’sRx

rangemaycausespuriousresponse,resultingindecreased

Rxperformance.

•TheTxpowerandcorrespondingbroadbandnoiseofother

wirelessdevicesmayoverloadorincreasethenoisefloorof

themodule’sreceiver,resultinginRxdesense.

Theseverityofthisinterferencedependsontheclosenessof

theotherantennastothemodule’santenna.Todetermine

suitablelocationsforeachwirelessdevice’santenna,

thoroughlyevaluateyourhostdevice’sdesign.

RF Integration

Rev 1.0 Apr.07 19

Values in this guide are summarized from the product specification documents (PSDs) - the PSD takes precedence.

Device-generated RF

Note: The module can cause

interference with other devices

such as hearing aids and on-

board speakers.

Wireless devices such as the

embedded module transmit in

bursts (pulse transients) for set

durations (RF burst frequencies).

Hearing aids and speakers

convert these burst frequencies

into audible frequencies,

resulting in audible noise.

AllelectroniccomputingdevicesgenerateRFinterferencethat

cannegativelyaffectthereceivesensitivityofthemodule

(RFdesense).

Theproximityofhostelectronicstotheantennainwireless

devicescancontributetoRFdesense.Componentsthatare

mostlikelytocauseRFdesenseinclude:

•Microprocessorandmemory

•Displaypanelanddisplaydrivers

•Switching‐modepowersupplies

Theseandotherhigh‐speeddevices(inparticular,the

processor)cancauseRFdesensebecausetheyrunat

frequenciesoftensofMHz.Therapidriseandfallofthese

clocksignalsgenerateshigher‐orderharmonicsthatoftenfall

withintheoperatingfrequencybandofthemodule,causing

RFdesense.

Example

Onasub‐systemrunningat40MHz,the22ndharmonicfalls

at880MHz,whichiswithinthecellularreceivefrequency

band.

Note: In practice, there are usually numerous interfering frequencies

and harmonics. The net effect can be a series of desensitized receive

channels.

GSM Embedded Modems Hardware Integration Guide

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In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.

Rev 1.0 Apr.07 21

4: Regulatory Information

Important notice

Becauseofthenatureofwirelesscommunications,trans‐

missionandreceptionofdatacanneverbeguaranteed.Data

maybedelayed,corrupted(i.e.,haveerrors)orbetotallylost.

Althoughsignificantdelaysorlossesofdataarerarewhen

wirelessdevicessuchastheSierraWirelessmodemareusedin

anormalmannerwithawell‐constructednetwork,theSierra

Wirelessmodemshouldnotbeusedinsituationswherefailure

totransmitorreceivedatacouldresultindamageofanykind

totheuseroranyotherparty,includingbutnotlimitedto

personalinjury,death,orlossofproperty.SierraWirelessand

itsaffiliatesacceptnoresponsibilityfordamagesofanykind

resultingfromdelaysorerrorsindatatransmittedorreceived

usingtheSierraWirelessmodem,orforfailureoftheSierra

Wirelessmodemtotransmitorreceivesuchdata.

Safety and hazards

DonotoperateyourEM8780/EM8781modem:

•Inareaswhereblastingisinprogress

•Whereexplosiveatmospheresmaybepresentincluding

refuellingpoints,fueldepots,andchemicalplants

•Nearmedicalequipment,lifesupportequipment,orany

equipmentwhichmaybesusceptibletoanyformofradio

interference.Insuchareas,theEM8780/EM8781modem

MUSTBEPOWEREDOFF.Otherwise,theEM878x

modemcantransmitsignalsthatcouldinterferewiththis

equipment.

Inanaircraft,theEM8780/EM8781modemMUSTBE

POWEREDOFF.Otherwise,theEM8780/EM8781modemcan

transmitsignalsthatcouldinterferewithvariousonboard

systemsandmaybedangeroustotheoperationoftheaircraft

ordisruptthecellularnetwork.Useofacellularphoneinan

aircraftisillegalinsomejurisdictions.Failuretoobservethis

instructionmayleadtosuspensionordenialofcellular

telephoneservicestotheoffender,orlegalactionorboth.

Someairlinesmaypermittheuseofcellularphoneswhilethe

aircraftisonthegroundandthedoorisopen.TheEM8780/

EM8781modemmaybeusednormallyatthistime.

GSM Embedded Modems Hardware Integration Guide

22 2130851

Important compliance

information for North American

users

TheEM8780/EM8781modemhasbeengrantedmodular

approvalformobileapplications.Integratorsmayusethe

EM8780/EM8781modemintheirfinalproductswithout

additionalFCC/IC(IndustryCanada)certificationifthey

meetthefollowingconditions.Otherwise,additionalFCC/IC

approvalsmustbeobtained.

1. Atleast20cmseparationdistancebetweentheantennaand

theuser’sbodymustbemaintainedatalltimes.

2. TocomplywithFCC/ICregulationslimitingbothmaximum

RFoutputpowerandhumanexposuretoRFradiation,the

maximumantennagainincludingcablelossinamobile‐only

exposureconditionmustnotexceed:

·5dBiintheCellularbandand4dBiinthePCSbandforthe

EM8780/EM8781modem

3. TheEM8780/EM8781modemanditsantennamustnotbe

co‐locatedoroperatinginconjunctionwithanyother

transmitterorantennawithinahostdevice.

4. Alabelmustbeaffixedtotheoutsideoftheendproductinto

whichtheEM8780/EM8781modemisincorporated,witha

statementsimilartothefollowing:

·ForEM8780:

ThisdevicecontainsFCCID:N7NEM8780

·ForEM8781:

ThisdevicecontainsFCCID:N7NEM8781

Thisequipmentcontainsequipmentcertifiedunder

IC:2417C‐EM8781

5. Ausermanualwiththeendproductmustclearlyindicatethe

operatingrequirementsandconditionsthatmustbeobserved

toensurecompliancewithcurrentFCC/ICRFexposure

guidelines.

TheendproductwithanembeddedEM8780/EM8781modem

mayalsoneedtopasstheFCCPart15unintentionalemission

testingrequirementsandbeproperlyauthorizedperFCCPart

15whereapplicable.

Note:Ifthismoduleisintendedforuseinaportabledevice,

youareresponsibleforseparateapprovaltosatisfytheSAR

requirementsofFCCPart2.1093andICRSS‐102.

Rev 1.0 Apr.07 23

A: Acronyms and Definitions

Table A-1: Acronyms and definitions

Acronym or term Definition

BER Bit Error Rate — a measure of receive sensitivity

BLER Block Error Rate

dB Decibel = 10 x log10 (P1/P2)

P1 is calculated power; P2 is reference power

Decibel = 20 x log10 (V1/V2)

V1 is calculated voltage, V2 is reference voltage

dBm Decibels, relative to 1 mW - Decibel(mW) = 10 x log10 (Pwr (mW)/

1mW)

EDGE Enhanced Data rates for GSM Evolution

EM Embedded Module

EM8780/EM8781 Sierra Wireless embedded modules used on GSM networks

ESD ElectroStatic Discharge

GPRS General Packet Radio Services

GPS Global Positioning System — a system that uses a series of 24

geosynchronous satellites to provide navigational data.

GSM Global System for Mobile communications

HSDPA High Speed Download Packet Access. An add-on data service to

GSM mobile phone networks.

Hz Hertz = 1 cycle/second

IS-95 2G radio standards targeted for voice (cdmaONE)

MHz MegaHertz = 10E6 Hertz (Hertz = 1 cycle/second)

PCS Personal Communication System — PCS spans the 1.9 GHz radio

spectrum

RF Radio Frequency

RUIM Removable User Identity Module

SCI Slot Cycle Index

Sensitivity (RF) Measure of lowest power signal at the receiver input that can

provide a prescribed BER/BLER/SNR value at the receiver output.

GSM Embedded Modems Hardware Integration Guide

24 2130851

SIM Subscriber Identity Module

SNR Signal to Noise Ratio

UMTS Universal Mobile Telecommunications System. See also WCDMA.

USB Universal Serial Bus

USIM Universal Subscriber Identity Module

WCDMA Wideband Code Division Multiple Access. In this document, the

term “UMTS” is used instead of “WCDMA”.

Table A-1: Acronyms and definitions

Acronym or term Definition

Rev 1.0 Apr.07 25

Index

acronymsanddefinitions 23–24

airplanemode 12

antenna

connectionandmountingpoints 16

connectionconsiderations 15

custom,considerations 17

diversityantenna,disabling 17

limit,matchingcoaxialconnections 15

location,considerations 17

matching,considerations 17

maximumcableloss 15

ATcommands

3GPPspecification,details 9

lowpowermode,setting 12

ATcommands,extended

EM878x,reference 9

ATcommands,standard

EM878x,reference 9

cableloss

antenna,maximum 15

CnS

EM878xreference 9

connection

grounding 16

connectors,required

host‐module 7–8

RF,IPEX 7

USIM/RUIM 7

current

consumption 13

usagemodels 13

DCS1800

RFparameters,EM878x 15

desense.SeeRF

diversityantenna

disabling 17

EGSM900

RFparameters,EM878x 15

electrostaticdischarge.SeeESD

EM878x

ATreference(extended) 9

ATreference(standard) 9

CnSreference, 9

productspecification 9

RFparameters 15

ESD

protectionrequirements 11

testingtechniquesdocument(IEC‐61000‐4‐2) 9

FCC

regulations,relevantsection 9

grounding

connectionconsiderations 16

GSM850

RFparameters,EM878x 15

impedance

module‐antenna 17

interference

devicegenerated 19

powersupplynoise 18

wirelessdevices 18

LabAdapterBoard 7

lowpowermode

setting,ATcommands 12

lowpower,modulepowerstate 12

module

powerstates 12

noise

leakage,minimizing 16

RFinterference,powersupply 18

normal,modulepowerstate 12

off,modulepowerstate 12

GSM Embedded Modems Hardware Integration Guide

26 2130851

PCS1900

RFparameters,EM878x 15

power

defaultstate 12

disconnected,characteristics 12

normal,characteristics 12

signals,overview 11

state,lowpower 12

state,normal 12

state,off 12

supply,RFinterference 18

supply,ripplelimit 18

powerinterface 11–13

PSD

EM878x 9

regulatoryinformation 21–22

FCC 22

limitationofliability 21

safetyandhazards 21

antennacableloss,maximum 15

antennaconnection,considerations 15

cabletype,required 7

desense

device‐generated 19

integration 15–19

interference

otherdevices 19

powersupply 18

wirelessdevices 18

parameters

DCS1800 15

EGSM900 15

EM878x 15

GSM850 15

PCS1900 15

UMTS1900 15

UMTS2100 15

UMTS850 15

shielding

module,compliance 16

SIM

testingmethods,MSconformancespecification 9

SIM.SeeUSIM/RUIM

testing

ESDimmunity,techniquesdocument(IEC‐61000‐

4‐2) 9

UMTS1900

RFparameters,EM878x 15

UMTS2100

RFparameters,EM878x 15

UMTS850

RFparameters,EM878x 15

UniversalSerialBus.SeeUSB

usagemodels

currentconsumption 13

USB

specification 9

USIM/RUIM

connectortype,required 7

ZIF(ZeroIntermediateFrequency) 18

Sierra Wireless EM8781 850/900/1800/1900/2100 MHz Multi-band Module User Manual

Sierra Wireless Inc. 850/900/1800/1900/2100 MHz Multi-band Module

User Manual

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