Multitech MultiModem ZBA MT9234ZBA Especificaciones descargar pdf (Pagina 23)

Chapter5‐Troubleshooting

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Multi‐TechSystems,Inc.MT9234ZBA‐USBUserGuide(S000473A) 23

TheModemDialsButCannotConnect

TherecanbeseveralreasonstheZBAfailstomakeaconnection.Possibilitiesinclude:

● lackofaphysicalconnectiontothetelephoneline.

● awrongdialtone.

● abusysignal.

● awrongnumber.

● nomodemattheotherend.

● afaultymodem,computer , orsoftwareattheotherend.

● incompatibilitybetweenmodems.

Youcannarrowthelistofpossibilitiesbyusingextendedresultcodes.Extendedresultcodesareenabledby

default.Iftheyhavebeendisabled, enterATV1X4andpressENTERwhileinterminalmode,orincludeV1X4inthe

modem’sinitializationstring.Whenyoudialagain,themodemwillreporttheca

ll’sprogress.

● IfthemodemreportsNODIALTONE,checkthatthemodem’stelephonelinecableisconnectedtoboth

themodem’sLINEjack(notthePHONEjack)andthetelephonewalljack.Ifthecablelookssecure,try

replacingit.Ifthatdoesn’twork,theproblemmightbeinyourbuilding’stelephoneinstallation.Totest

thebuildingi

nstallation,plugatelephoneintoyourmodem’stelephonewalljackandlistenforadial

tone.Ifyouhearadialtone,yourmodemmightbeinstalledbehindacompanyphonesystem(PBX)with

aninternaldialtonethatsoundsdifferentfromthenormaldialtone.Inthatca

se,themodemmightnot

recognizethedialtoneandmighttreatitasanerror.CheckyourPBXmanualtoseeifyoucanchangethe

internaldialtone;ifyoucan’t,changeyourmodem’sinitializationstringtoreplaceX4withX3,whichwill

causethemodemtoignoredialtones(note,howeve

r,thatX3isnotallowedinsomecountries,suchas

FranceandSpain).

● IfthemodemreportsBUSY,theothernumbermightbebusy,inwhichcaseyoushouldtryagainlater,or

itmightindicatethatyouhavefailedtoadda9,prefixtothephonenumberifyoumustdial9foran

outsideline.

● Ifyoumustdial9togetanoutsideline,theeasiestwaytodialitautomaticallyistoincludeitinthe

modem’sdialprefix,e.g.,ATDT9,.Notethecomma,whichinsertsapausebefo rethenumberisdialed.By

inserting9,intothedialprefix,youdonothavetoin

cludeitineachdirectoryentry.

● TochangethedialprefixinWindows98HyperTerminal,selectCallfromtheCallmenu,clickDialing

Properties,andtype9inthelocalandlongdistanceboxesinHowIdialfromthislocation.

● IfthemodemreportsNOANSWER,theothersystemhasfailedtogooff‐hook,oryoumighthavedialeda

wrongnumber.Checkthenumber.

● IfthemodemreportsNOCARRIER,thephonewasansweredattheotherend,butnoconnectionwas

made.Youmighthavedialedawrongnumber,andapersonansweredinsteadofacomputer,oryou

mighthavedialedthecorrectnumber,buttheothercomputerorsoftwarewasturnedofforfaulty.

Checkth

enumberandtryagain,ortrycallinganothersystemtomakesureyourmodemisworking.Also,

trycallingthenumberonyourtelephone.Ifyouhearharshsounds,thenanothermodemisanswering

thecall,andthemodemsmightbehavingproblemsnegotiatingbecauseofmodemi

ncompatibilitiesor

linenoise.Tryconnectingatalowerspeed.

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