Multi-Tech Systems manual MT3334SMI Design Considerations, Hardware Considerations

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ModemModule Developer’s Guide

MT3334SMI Design Considerations

This section discusses hardware considerations, PC board layout considerations, and Telecom labeling requirements.

Hardware Considerations

Disclaimer: Multi-Tech Systems makes no warranty claims for vendor product recommendations listed below. Other vendor products may or may not operate satifactorily. Multi-Tech System’s recommended vendor products only indicate that the product has been tested in controlled conditions and were found to perform satisfactorily.

C2220PF/2KV

TIP

RINGR1

TR600-150

FB2

FERRITE-600

FB1

FERRITE-600

J1

x6

x5

4

3

x2

x 1

Loaded 4 Pin Modjack

C1220PF/2KV

Figure 1-7. Tip and Ring Ferrite Connections

EMC: Surface mount ferrites are used on T&R (Tip and Ring) to mitigate emission levels out the RJ- 11 cable. 220pF capacitors are also used on T&R to reduce the common mode emissions that may be present in certain systems. The ferrite and capacitors also aid in reducing the effects of transients that may be present on the line.

Recommended Ferrite

Manufacturer – Associated Component Technology (ACT)

Part # - YCB-1206

Manufacturer – Murata Erie

Part # - BLM31A601SPT

Recommended Capacitor
Manufacturer – Murata Erie	Manufacturer - Ever Grace Electronic Industrials
Part # - GHM3045X7R221K-GC(Surface mnt)	Part # - YP221K2EA7PS
Part # - DE0807B221K-KH (Thru-hole device)

Note: The capacitors used on T&R must have a Y2 safety rating.

Telecom: The RJ-11 connector must meet FCC Part 68 requirements. Refer to FCC Part 68 section 68.500 subpart F for connector specifications. A self-healing fuse is used in series with line to help prevent damage to the DAA circuit. This fuse is needed for FCC Part 68 compliance.

Recommended Connector

Manufacturer – Stewart

Part # - 6446S/RP-30

Recommended Fuse

Manufacturer – RayChem

Part # - TR600-150

Note: The fuse is also needed to meet UL1950 3rd edition protection against overvoltage from power line crosses.

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MT3334SMI

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Contents Model MT3334SMI Evaluation Kit Data/Fax Socketed ModemRevision Description PatentsContents Index Introduction and Description Product Description FeaturesIntroduction ModemModule Developer’s GuideTechnical Specifications Introduction and Description1200 bps Physical Dimensions MT3334SMI Physical DimensionsLED1-LED4 Test/Demo Board SpecificationsDS1 Test/Demo Board Block Diagram MT3334SMI Test/Demo Board Block DiagramMT3334SMI Pin-out MT3334SMI PinoutTypical Application MT3334SMI Design Considerations Hardware ConsiderationsRecommended Transceiver PC Board Layout ConsiderationsCalculating Z for Tip and Ring Traces Qty Name Description MT3334SMI PlacementKey Telecom Labeling Requirements FCC PartMultiple Listing ReregistrationIndustry Canada CS-03 AT Commands, S-Registers, and Result Codes Repeat Last Command AnswerAT Commands, S-Registers, and Result Codes Return Online to Data Mode Monitor Speaker VolumeMonitor Speaker Mode Result Codes Enable/DisableTone Dialing Modem ResetSr? Read Register Value Result Code FormatDisplay Current Settings Command &Fn Load Factory SettingsAsynchronous Communications Mode Store Current Configuration\Bn Transmit Break Command &Zy=x Store Dialing Command\An Select Maximum MNP Block Size \Jn Data Buffer Control\Qn Flow Control Selection \Nn Error Correction Mode Selection\Tn Inactivity Timer \Vn Protocol Result CodeCommand +ES=n Enable Synchronous Buffered Mode Command %DCn AT Command ControlCommand %En Fallback and Fall Forward Control Enter Setup PasswordRegister Unit Range Default Description RegistersS43 Result Codes Terse Verbose DescriptionClass 1 Fax Commands Class 1 Fax Command Summary Command DescriptionFunction Display Current Class Values Default Data modem Class 1 Fax Commands Fax MOD Modulation Parameter ValuesCommand Result Code MeaningFunction ModemModule Developer’s Guide CommandFunction Select Service Class Values Default Data mode Class 1 Fax Commands +FRS=? Enter+FRM=? Enter Sample Sessions Flow ControlResult Codes Action by Command Respone Local Modem Remote PC AT+FRH=3 No Carrier ModemModule Developer’s Guide Class 2 Fax Commands +FAA Class 2 Fax Command ImplementationClass 2 Fax Commands EIA SP-2388 August +FAXERR+FCR +FBOR+FCQ +FDCS +FDCCFax Capability Parameters Current Session Results+FDIS +FDFFCData Compression Format Conversion Current Session Parameters+FECM +FDR+FDT +FET+FLNFC +FK+FLID +FLPL+FREL +FPTS+FRBC +FSPL+FHNG +FTSIMT3334SMI Remote Configuration Changing the Setup Password Basic ProcedureSetup ModemModule User GuideRemote Configuration Changing the Remote Escape CharacterMT3334SMI Troubleshooting Test procedure Local Analog Loopback Test V.54 LoopTroubleshooting Remote Digital Loopback Test V.54 LoopLocal Digital Loopback Test V.54 Loop Local digital loopback testUpgrade Procedure Identify the Current Firmware Version Upgrade OverviewIdentify the Modem Firmware Multi-Tech Web SiteMulti-Tech BBS Download the Upgrade FileUpgrade Procedure Restore Your Parameters Extract the Upgrade FilesUse FlashPro to Upgrade Modem Firmware Clear Your Stored ParamentersAppendixes MT3334SMI Canadian Limitations Notice FCC FAX UpdateInternational Modem Restrictions AppendixesNew Zealand Telecom Warning Notice EMC, Safety and Terminal Directive ComplianceEuropean Directives User Guide Statement Programming the Modem Appendix B Multi-Tech Flash Programming ProtocolIntroduction Handshake SequenceModemModule Developer’s Guide Program Sequence Other supported boot code commandsOther programming concerns Xxxx Intel Hex FormatData Record Eeee Extended Address RecordEnd of File Record Index IndexMT3334SM MT3334SMI MT3334SM