Zhone 3821Plus User's Guide

COMSPHERE3821PLUS MODEMUSER’S GUIDEDocument No. 3821-A2-GB20-40January 1999

COMSPHERE 3821Plus Modemii January 1999 3821-A2-GB20-404. AT Commands and S-RegistersOverview 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3821Plus Modem4-24 January 1999 3821-A2-GB20-40Table 4-2(9 of 10)3821Plus S-RegistersS84 – AT Command ModeDetermines how the modem responds

AT Commands and S-Registers4-253821-A2-GB20-40 January 1999Table 4-2(10 of 10)3821Plus S-RegistersS91 – Cellular EnhancementValid only if ETC is inst

COMSPHERE 3821Plus Modem4-26 January 1999 3821-A2-GB20-40Recovering AT CommandsCertain dialing methods, such as V.25bis andsynchronous operation, disa

AT Commands and S-Registers4-273821-A2-GB20-40 January 1999Initialization StringsAn initialization string contains several AT commandsthat are entere

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5-13821-A2-GB20-40 January 1999Fax OperationOverview 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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6-13821-A2-GB20-40 January 1999Remote AccessOverview 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3821Plus Modem6-2 January 1999 3821-A2-GB20-40NOTEIf a connection is not establishedbetween a local COMSPHEREmodem and a remote 3821Plusmode

7-13821-A2-GB20-40 January 1999SecurityOverview 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contentsiii3821-A2-GB20-40 January 1999D. Technical SpecificationsE. Pin AssignmentsEIA-232-E Pin Assignments E-1. . . . . . . . . . . . . .

COMSPHERE 3821Plus Modem7-2 January 1999 3821-A2-GB20-40VF PasswordsVF passwords consist of DTMF tones and are enteredby the originating caller using

Security7-33821-A2-GB20-40 January 1999Callback SecurityCallback Security causes the responding modem todisconnect and call back to the phone number

COMSPHERE 3821Plus Modem7-4 January 1999 3821-A2-GB20-40EditPassWdTable The Password Table is the modem’s security database.It contains all essential

Security7-53821-A2-GB20-40 January 1999Table 7-1(2 of 2)Edit Password Table Group OptionsEdit PsWd xxxxNxt  yyyyyyyy or zzzzzzEdit Password. Allow

COMSPHERE 3821Plus Modem7-6 January 1999 3821-A2-GB20-40Set Answer Sec Set Answer Security determines if dial access securityis enabled or disabled. T

Security7-73821-A2-GB20-40 January 1999Set Orig SecurSet Originate Security controls whether or not themodem can originate a call using AT commands w

COMSPHERE 3821Plus Modem7-8 January 1999 3821-A2-GB20-40Set Admin PsWdSet Administration Password is used to change theAdministration Password value.N

Security7-93821-A2-GB20-40 January 1999Security ConfigurationOptionsThe Security Configuration Options group under theConfigure branch allows you to

COMSPHERE 3821Plus Modem7-10 January 1999 3821-A2-GB20-40Table 7-5(2 of 3)Security Configuration OptionsDTE_PW_TermChar: 013Nxt 013DTE Password Termi

Security7-113821-A2-GB20-40 January 1999Table 7-5(3 of 3)Security Configuration OptionsOriginate_Secur: No_OrigSecNxt No_OrigSec Ena_Orig_SecOriginat

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A-13821-A2-GB20-40 January 1999SDCP Menu TreeOverview A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3821Plus ModemA-2 January 1999 3821-A2-GB20-40Call_SetupStatus Test(Modem Status)DialDisconnectAnswerChange_DirectoryDirectory Locations 1 –

SDCP Menu TreeA-33821-A2-GB20-40 January 1999ConfigureLd EditArea frm:Edit SaveChoose FunctionActive (Saved) Customer1 Customer2V42/MNP/BufferErr Con

COMSPHERE 3821Plus ModemA-4 January 1999 3821-A2-GB20-40Control RemoteSecondary Prim (data blckd)(ExitRem appears instead of Remote when using Remote

B-13821-A2-GB20-40 January 1999Result CodesOverview B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3821Plus ModemB-2 January 1999 3821-A2-GB20-40Table B-1(2 of 3)Result CodesNumbers (1) DescriptionWordNumbers (2)15 14 CONNECT 19200** Conne

Result CodesB-33821-A2-GB20-40 January 1999Table B-1(3 of 3)Result CodesNumbers (1) DescriptionWordNumbers (2)43 43 CONNECT 21600/ EC*** Connection a

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C-13821-A2-GB20-40 January 1999TroubleshootingOverview C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

v3821-A2-GB20-40 January 1999PrefaceObjectives and ReaderAssumptionsThis guide describes how to install the 3821Plus circuitcard and operate the 3821P

COMSPHERE 3821Plus ModemC-2 January 1999 3821-A2-GB20-40Table C-2Online OperationSymptomActionData scrambled orunreadableVerify that the character for

TroubleshootingC-33821-A2-GB20-40 January 1999Table C-5(1 of 2)Modem – VF ConnectionSymptomActionModem does not receive adial toneCheck the VF line c

COMSPHERE 3821Plus ModemC-4 January 1999 3821-A2-GB20-40Table C-5(2 of 2)Modem – VF ConnectionSymptom ActionIntermittent disconnects,high error rates,

TroubleshootingC-53821-A2-GB20-40 January 1999Automatic FirmwareDownloadNew releases may be available for the 3821Plusmodem. The latest 3821Plus firm

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D-13821-A2-GB20-40 January 1999Technical SpecificationsTable D-1(1 of 2)Model 3821Plus Technical SpecificationsSpecificationsDescriptionAPPROVALS Refe

COMSPHERE 3821Plus ModemD-2 January 1999 3821-A2-GB20-40Table D-1(2 of 2)Model 3821Plus Technical SpecificationsSpecifications DescriptionENVIRONMENTO

E-13821-A2-GB20-40 January 1999Pin AssignmentsEIA-232-E Pin Assignments E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3821Plus ModemE-2 January 1999 3821-A2-GB20-40JM8 to RJ11 Crossover CableFor 2-wire leased-line connections to a JM8 networkinterface, an 8-

Pin AssignmentsE-33821-A2-GB20-40 January 1999NIM Cable Pin AssignmentsTable E-2 lists the pin assignments for the 50-pin cableconnected to the NIM.T

COMSPHERE 3821Plus Modemvi January 1999 3821-A2-GB20-40Related Documents3000-A2-GA31 COMSPHERE 3000 SeriesCarrier Installation Manual3980-A2-GB30 COMS

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F-13821-A2-GB20-40 January 1999ITU-T V.25bis Dialing Commandsand ResponsesOverview F-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3821Plus ModemF-2 January 1999 3821-A2-GB20-40Call Request CommandsCall Request commands are issued from the DTE tothe modem and are respons

ITU-T V.25bis Dialing Commands and ResponsesF-33821-A2-GB20-40 January 1999Call Connecting (CNX)The CNX response informs the DTE that the modemhas co

COMSPHERE 3821Plus ModemF-4 January 1999 3821-A2-GB20-40Command Response A Command Response indicates that the commandentered was a valid or invalid e

ITU-T V.25bis Dialing Commands and ResponsesF-53821-A2-GB20-40 January 1999Table F-2 lists V.25bis response messages supported bythe 3821Plus modem.T

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G-13821-A2-GB20-40 January 1999Equipment ListEquipment Order Number Part Number3821Plus Modem Card (three modems per card) 3821-B1-001 —NIM with Make

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H-13821-A2-GB20-40 January 1999Country-Specific ConfigurationOptionsConfiguration Options by Country Code H-1. . . . . . . . . . . . . . . . . . . . .

1-13821-A2-GB20-40 January 1999IntroductionOverview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3821Plus ModemH-2 January 1999 3821-A2-GB20-40Table H-1(1 of 5)Configuration Options by Country (A through M)Strap Description DCP Choice AT

Country-Specific Configuration OptionsH-33821-A2-GB20-40 January 1999Table H-1(2 of 5)Configuration Options by Country (A through M)AustraliaJapanIta

COMSPHERE 3821Plus ModemH-4 January 1999 3821-A2-GB20-40Table H-1(3 of 5)Configuration Options by Country (A through M)AustraliaJapanItalyIsraelGerman

Country-Specific Configuration OptionsH-53821-A2-GB20-40 January 1999Table H-1(4 of 5)Configuration Options by Country (A through M)AustraliaJapanIta

COMSPHERE 3821Plus ModemH-6 January 1999 3821-A2-GB20-40Table H-1(5 of 5)Configuration Options by Country (A through M)AustraliaJapanItalyIsraelGerman

Country-Specific Configuration OptionsH-73821-A2-GB20-40 January 1999Table H-2(1 of 5)Configuration Options by Country (N through Z)Strap Description

COMSPHERE 3821Plus ModemH-8 January 1999 3821-A2-GB20-40Table H-2(2 of 5)Configuration Options by Country (N through Z)NetherlandsUnited KingdomTurkey

Country-Specific Configuration OptionsH-93821-A2-GB20-40 January 1999Table H-2(3 of 5)Configuration Options by Country (N through Z)NetherlandsUnited

COMSPHERE 3821Plus ModemH-10 January 1999 3821-A2-GB20-40Table H-2(4 of 5)Configuration Options by Country (N through Z)NetherlandsUnited KingdomTurke

Country-Specific Configuration OptionsH-113821-A2-GB20-40 January 1999Table H-2(5 of 5)Configuration Options by Country (N through Z)NetherlandsUnite

COMSPHERE 3821Plus Modem1-2 January 1999 3821-A2-GB20-40• Storage of up to 10 telephone numbers to directorylocations.• Originate Security and three A

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Glossary-13821-A2-GB20-40 January 1999GlossaryActive (Operating) A configuration area containing configuration options currently in use by the modem.W

COMSPHERE 3821Plus ModemGlossary-2 January 1999 3821-A2-GB20-40automatic answer A capability to respond to a call received over a dial line.automode T

GlossaryGlossary-33821-A2-GB20-40 January 1999configuration option Modem software that sets specific operating parameters for the modem. Sometimesref

COMSPHERE 3821Plus ModemGlossary-4 January 1999 3821-A2-GB20-40directory location Nonvolatile memory that stores up to ten telephone numbers. Each dir

GlossaryGlossary-53821-A2-GB20-40 January 1999handshaking The exchange of predetermined codes and signals (tones) to establish a connectionbetween tw

COMSPHERE 3821Plus ModemGlossary-6 January 1999 3821-A2-GB20-40Originate mode The state of a modem ready to transmit a call. In a dial network, it is

GlossaryGlossary-73821-A2-GB20-40 January 1999S-registers Registers that contain information affecting modem operation. S-register commandsmust be pr

COMSPHERE 3821Plus ModemGlossary-8 January 1999 3821-A2-GB20-40V.42bis ITU-T standard for data compression.V.54 ITU-T standard for local and remote di

Index-13821-A2-GB20-40 January 1999IndexSymbols! (hook flash), 4-4“,” dial modifier (Pause), 4-3“,” Pause Time (S8), 4-17“;” (return to command mode),

Introduction1-33821-A2-GB20-40 January 1999Table 1-13821Plus LEDsLabelColor IndicatesALRM A red Alarm AON: Modem A has detected a problem with its op

COMSPHERE 3821Plus ModemIndex-2 January 1999 3821-A2-GB20-40AT commands, continuedE (Command Character Echo), 3-26, 4-4H (Hook Switch Control), 4-4I (

IndexIndex-33821-A2-GB20-40 January 1999default configuration options, 2-5setting with AT commands, 2-6setting with DCP, 2-5Dial, 3-9Dial (ATD), 4-3D

COMSPHERE 3821Plus ModemIndex-4 January 1999 3821-A2-GB20-40Ggang box, RJ11, 2-2Get_User_ID, 7-10Hhang up (ATH), 4-4Hidden Choice Indicators, 1-4hook

IndexIndex-53821-A2-GB20-40 January 1999PP (Pulse dial), 4-3Parity Bit, 3-20part numbers, G-1passwordAdministration, 7-1, 7-8number of DTE password t

COMSPHERE 3821Plus ModemIndex-6 January 1999 3821-A2-GB20-40S-registers, continuedS90 (DTE Rate = VF Rate), 3-24, 4-24S91 (Cellular Enhancement), 3-43

00282600– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

COMSPHERE 3821Plus Modem1-4 January 1999 3821-A2-GB20-40SDCP OperationThe SDCP on the 3000 Series Carrier is the userinterface to all functions used t

2-13821-A2-GB20-40 January 19993821Plus Modem InstallationOverview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3821Plus ModemA January 1999 3821-A2-GB20-40COMSPHERE3821Plus ModemUser’s Guide3821-A2-GB20-405th Edition (January 1999)Changes and enhancem

COMSPHERE 3821Plus Modem2-2 January 1999 3821-A2-GB20-40P26 P25P24P23P20 P19J2 P22J1P21495-14854TO P23OR P25TO P24OR P26NETWORKINTERFACEMODULE(NIM)NIM

3821Plus Modem Installation2-33821-A2-GB20-40 January 1999Attach the DTE Interface AssemblyThe eight-slot DTE interface assembly can be mountedon the

COMSPHERE 3821Plus Modem2-4 January 1999 3821-A2-GB20-40Install the Circuit CardSlide the 3821Plus card into its slot in the 3000 SeriesCarrier. Press

3821Plus Modem Installation2-53821-A2-GB20-40 January 1999Install CommunicationsSoftwareA computer commands and controls a modem throughcommunication

COMSPHERE 3821Plus Modem2-6 January 1999 3821-A2-GB20-405. Press the key until the appropriate factorypreset appears on the LCD, and press thecorr

3821Plus Modem Installation2-73821-A2-GB20-40 January 1999To change a factory template using AT commands,perform the following steps (for more inform

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3-13821-A2-GB20-40 January 1999SDCP MenusMenu Structure 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3821Plus Modem3-2 January 1999 3821-A2-GB20-40Menu StructureAn elaborate menu of options is available from aShared Diagnostic Control Panel

SDCP Menus3-33821-A2-GB20-40 January 1999Modem Status MessagesAccess to all menu tree branches from the SDCPbegins at the Top-Level menu, the head of

Safety InstructionsB3821-A2-GB20-40 January 1999!Important Safety Instructions1. Read and follow all warning notices and instructions marked on the pr

COMSPHERE 3821Plus Modem3-4 January 1999 3821-A2-GB20-40Table 3-1(2 of 3)Top-Level Menu StatusNormal CallSetup MessagesIndicatesOff Hook The modem is

SDCP Menus3-53821-A2-GB20-40 January 1999Table 3-1(3 of 3)Top-Level Menu StatusCall DisconnectMessages,continuedIndicatesLongSpace Disc The modem has

COMSPHERE 3821Plus Modem3-6 January 1999 3821-A2-GB20-40Table 3-3Dial Access Security MessagesDial AccessSecurityMessagesIndicatesGet VF PsWd The answ

SDCP Menus3-73821-A2-GB20-40 January 1999Modem Select BranchThe Modem Select branch is the top level of the menustructure. The modem selections are d

COMSPHERE 3821Plus Modem3-8 January 1999 3821-A2-GB20-40ffff Displays the modem’s modulation scheme asshown below:V34 indicates V.34 family modulation

SDCP Menus3-93821-A2-GB20-40 January 1999Call Setup BranchThe Call Setup branch of the Top-Level menu allowsyou to dial, disconnect, and answer telep

COMSPHERE 3821Plus Modem3-10 January 1999 3821-A2-GB20-40Change DirectoryChange Directory allows you to enter or modifytelephone numbers. The modem ha

SDCP Menus3-113821-A2-GB20-40 January 1999Status BranchThe Status branch of the Top-Level menu allows youto view the current status of the dial or le

COMSPHERE 3821Plus Modem3-12 January 1999 3821-A2-GB20-40IdentityIdentity displays the modem’s serial number, modelnumber, firmware revision level, ha

SDCP Menus3-133821-A2-GB20-40 January 1999To exit this function and remain in the Status branch,press the key. To exit and return to the Top-Level

COMSPHERE 3821Plus ModemC January 1999 3821-A2-GB20-40Notices              

COMSPHERE 3821Plus Modem3-14 January 1999 3821-A2-GB20-40If the Test Timeout configuration option is enabled,Test Timeout appears at the conclusion of

SDCP Menus3-153821-A2-GB20-40 January 1999To exit this function and remain in the Test branch,press the key. To exit and return to the Top-Levelme

COMSPHERE 3821Plus Modem3-16 January 1999 3821-A2-GB20-40Activ(Operating)Active(Saved)Customer1Customer2FactoryAsync_DialSync_DialSync_LeasedUNIX_Dial

SDCP Menus3-173821-A2-GB20-40 January 1999Scroll to and select the Misc configuration optionsgroup.F1Edit StrapGroup <Test

COMSPHERE 3821Plus Modem3-18 January 1999 3821-A2-GB20-40• The key causes you to exit the Configurebranch and return to the Top-Level menu. If any

SDCP Menus3-193821-A2-GB20-40 January 1999Table 3-4(1 of 6)DTE Interface Configuration OptionsAsync/Sync Mode: AsyncNxt Async SyncAsynchronous/Sy

COMSPHERE 3821Plus Modem3-20 January 1999 3821-A2-GB20-40Table 3-4(2 of 6)DTE Interface Configuration OptionsAsyn Parity Bit: NoneNxt None Even Odd Ma

SDCP Menus3-213821-A2-GB20-40 January 1999Table 3-4(3 of 6)DTE Interface Configuration OptionsDTR Action: IgnoreNxt Stndrd_RS232 Ignore CntrlsO

COMSPHERE 3821Plus Modem3-22 January 1999 3821-A2-GB20-40Table 3-4(4 of 6)DTE Interface Configuration OptionsRTS Action: IgnoreNxt Ignore Stndrd_RS232

SDCP Menus3-233821-A2-GB20-40 January 1999Table 3-4(5 of 6)DTE Interface Configuration OptionsRTS/CTS Delay: 0 msecNxt 0msec 10msec 50msec 15

Safety InstructionsD3821-A2-GB20-40 January 1999Government Requirements and Equipment ReturnCertain governments require that instructions pertaining t

COMSPHERE 3821Plus Modem3-24 January 1999 3821-A2-GB20-40Table 3-4(6 of 6)DTE Interface Configuration OptionsTX Clock Source: InternalNxt Internal Ext

SDCP Menus3-253821-A2-GB20-40 January 1999DTE Dialer The DTE Dialer configuration options establish theDTE-to-modem protocol for call establishment a

COMSPHERE 3821Plus Modem3-26 January 1999 3821-A2-GB20-40Table 3-5(2 of 5)DTE Dialer Configuration Options*Escape GuardTim: 1secNxt 1sec 200msec 400ms

SDCP Menus3-273821-A2-GB20-40 January 1999Table 3-5(3 of 5)DTE Dialer Configuration Options*Linefeed Char: 010 ASCINxt ↑ 010 ASCILine Feed Character.

COMSPHERE 3821Plus Modem3-28 January 1999 3821-A2-GB20-40Table 3-5(4 of 5)DTE Dialer Configuration Options*ResultCode Form: WordsNxt Words Numbers (1)

SDCP Menus3-293821-A2-GB20-40 January 1999Table 3-5(5 of 5)DTE Dialer Configuration OptionsV25bis IdleFill: MarkNxt Mark FlagV.25bis Idle Fill. Deter

COMSPHERE 3821Plus Modem3-30 January 1999 3821-A2-GB20-40Line DialerThe Line Dialer configuration options establishparameters used by the modem to ans

SDCP Menus3-313821-A2-GB20-40 January 1999Table 3-6(2 of 4)Line Dialer Configuration OptionsBusyTone Detect: EnableNxt Enable DisableBusy Tone Detect

COMSPHERE 3821Plus Modem3-32 January 1999 3821-A2-GB20-40Table 3-6(3 of 4)Line Dialer Configuration OptionsLong Space Disc: EnableNxt Enable DisableLo

SDCP Menus3-333821-A2-GB20-40 January 1999Table 3-6(4 of 4)Line Dialer Configuration OptionsNoDataDiscTrig: TXD and RXDNxt TXD and RXD TXD Only R

COMSPHERE 3821Plus ModemE January 1999 3821-A2-GB20-40CanadaNotice to Users of the Canadian Public Switched Telephone NetworkThe Canadian Department o

COMSPHERE 3821Plus Modem3-34 January 1999 3821-A2-GB20-40Dial LineThe Dial Line configuration options are used toconfigure the modem for operation ove

SDCP Menus3-353821-A2-GB20-40 January 1999Table 3-7(2 of 3)Dial Line Configuration OptionsAutomode: EnableNxt Enable Disable System 85Automode. All

COMSPHERE 3821Plus Modem3-36 January 1999 3821-A2-GB20-40Table 3-7(3 of 3)Dial Line Configuration OptionsV22b Guard Tone: DisableNxt Disable 550Hz 180

SDCP Menus3-373821-A2-GB20-40 January 1999Leased LineThe Leased Line configuration options are used toconfigure the modem for operation over leased l

COMSPHERE 3821Plus Modem3-38 January 1999 3821-A2-GB20-40Table 3-8(2 of 2)Leased Line Configuration OptionsAutorate: EnableNxt Enable DisableAutorate.

SDCP Menus3-393821-A2-GB20-40 January 1999V.42/MNP/BufferV.42/MNP/Buffer configuration options determine thetype of error correction and flow control

COMSPHERE 3821Plus Modem3-40 January 1999 3821-A2-GB20-40Table 3-9(2 of 5)V.42/MNP/Buffer Configuration OptionsV42bis Compress: EnableNxt Enable D

SDCP Menus3-413821-A2-GB20-40 January 1999Table 3-9(3 of 5)V.42/MNP/Buffer Configuration OptionsFlw Cntl of DTE: CTS_to_DTENxt CTS_to_DTE Disable XON

COMSPHERE 3821Plus Modem3-42 January 1999 3821-A2-GB20-40Table 3-9(4 of 5)V.42/MNP/Buffer Configuration OptionsMdm/Mdm FlowCtl: DisableNxt Disable Ena

SDCP Menus3-433821-A2-GB20-40 January 1999Table 3-9(5 of 5)V.42/MNP/Buffer Configuration OptionsTXBuffDiscDelay: 10secNxt 10sec Disable 60secT

Safety InstructionsF3821-A2-GB20-40 January 1999This modem is suitable for connection to BT circuits with signalling at a nominal frequency of 2280 Hz

COMSPHERE 3821Plus Modem3-44 January 1999 3821-A2-GB20-40TestThe Test configuration options determine specifics,such as the duration of a test, for th

SDCP Menus3-453821-A2-GB20-40 January 1999MiscThe Miscellaneous configuration options determinespecifics for various functions, including networkmana

COMSPHERE 3821Plus Modem3-46 January 1999 3821-A2-GB20-40Table 3-11(2 of 2)Miscellaneous Configuration OptionsNetMngmtAddress: 256Nxt  256Network M

SDCP Menus3-473821-A2-GB20-40 January 1999Security Configuration Options The Security configuration options group is describedin Chapter 7, Security.

COMSPHERE 3821Plus Modem3-48 January 1999 3821-A2-GB20-40Download CodeThe Download Code function allows firmware to beloaded into a modem from another

SDCP Menus3-493821-A2-GB20-40 January 1999Automatic FirmwareDownloadNew releases may be available for the 3821Plusmodem. The latest 3821Plus firmware

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4-13821-A2-GB20-40 January 1999AT Commands and S-RegistersOverview 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3821Plus Modem4-2 January 1999 3821-A2-GB20-40To enter online Command mode while in Data mode,enter the following sequence:TYPE: +++Use the

AT Commands and S-Registers4-33821-A2-GB20-40 January 1999Table 4-1(1 of 13)3821Plus AT Commands*** – AT Command Recovery ModeAllows the modem to rem

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COMSPHERE 3821Plus Modem4-4 January 1999 3821-A2-GB20-40Table 4-1(2 of 13)3821Plus AT CommandsDn, continuedR – Reverse Dial mode. Causes the originati

AT Commands and S-Registers4-53821-A2-GB20-40 January 1999Table 4-1(3 of 13)3821Plus AT CommandsP – Pulse DialSets the modem for Pulse Dial mode. See

COMSPHERE 3821Plus Modem4-6 January 1999 3821-A2-GB20-40Table 4-1(4 of 13)3821Plus AT CommandsXn– Extended Result Codes,Dial Tone Detect,and Busy Tone

AT Commands and S-Registers4-73821-A2-GB20-40 January 1999Table 4-1(5 of 13)3821Plus AT Commands″F – Clear Error BufferClears the buffer where inform

COMSPHERE 3821Plus Modem4-8 January 1999 3821-A2-GB20-40Table 4-1(6 of 13)3821Plus AT Commands&Dn – DTR ActionData Terminal Ready (DTR) is a signa

AT Commands and S-Registers4-93821-A2-GB20-40 January 1999Table 4-1(7 of 13)3821Plus AT Commands&In – Dial Transmit Level for Cellular AutoWhen D

COMSPHERE 3821Plus Modem4-10 January 1999 3821-A2-GB20-40Table 4-1(8 of 13)3821Plus AT Commands&Mn or &Qn – Async/Sync Mode and DTE Dialer Typ

AT Commands and S-Registers4-113821-A2-GB20-40 January 1999Table 4-1(9 of 13)3821Plus AT Commands&Sn – DSR Control Data Set Ready (DSR) is a sign

COMSPHERE 3821Plus Modem4-12 January 1999 3821-A2-GB20-40Table 4-1(10 of 13)3821Plus AT Commands&Xn – Transmit Clock SourceDetermines the source o

AT Commands and S-Registers4-133821-A2-GB20-40 January 1999Table 4-1(11 of 13)3821Plus AT Commands%Cn – MNP5 Data CompressionDetermines if the modem

i3821-A2-GB20-40 January 1999Table of ContentsPrefaceObjectives and Reader Assumptions v. . . . . . . . . . . . . . . . . . . . . . . . . How to Use T

COMSPHERE 3821Plus Modem4-14 January 1999 3821-A2-GB20-40Table 4-1(12 of 13)3821Plus AT Commands\Kn – Buffer Control, Send Break Control, Break Forces

AT Commands and S-Registers4-153821-A2-GB20-40 January 1999Table 4-1(13 of 13)3821Plus AT Commands\  –       

COMSPHERE 3821Plus Modem4-16 January 1999 3821-A2-GB20-40S-Register ListS-registers affect the operating parameters of the3821Plus modem. These regist

AT Commands and S-Registers4-173821-A2-GB20-40 January 1999Table 4-2(2 of 10)3821Plus S-RegistersS4 – Line Feed CharacterDetermines ASCII value used

COMSPHERE 3821Plus Modem4-18 January 1999 3821-A2-GB20-40Table 4-2(3 of 10)3821Plus S-RegistersS14 – Asymmetric Rate ModeRegister determines whether V

AT Commands and S-Registers4-193821-A2-GB20-40 January 1999Table 4-2(4 of 10)3821Plus S-RegistersS40 – Auto Make BusyRegister determines whether the

COMSPHERE 3821Plus Modem4-20 January 1999 3821-A2-GB20-40Table 4-2(5 of 10)3821Plus S-RegistersS44 – Leased Line RateDetermines the modem’s highest da

AT Commands and S-Registers4-213821-A2-GB20-40 January 1999Table 4-2(6 of 10)3821Plus S-RegistersS49 – Transmit Buffer Disconnect DelayDetermines the

COMSPHERE 3821Plus Modem4-22 January 1999 3821-A2-GB20-40Table 4-2(7 of 10)3821Plus S-RegistersS63 – V.25bis Idle CharacterIdentifies to the modem the

AT Commands and S-Registers4-233821-A2-GB20-40 January 1999Table 4-2(8 of 10)3821Plus S-RegistersS76 – Autorate (Dial Line)Determines if the Autorate