Multitech MT9234ZPX-UPCI Uživatelská příručka stáhnout pdf (Strana 20)

Appendix A - Troubleshooting

20 MultiModem ZPX UPCI/PCIe User Guide

Modem Cannot Connect When Dialing

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

● no physical connection to a phone 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

● poor line conditions

Use extended result codes to narrow the list. Extended result codes are enabled by default. If they have been

disabled, include V1X4 in the modem’s initialization string, or in terminal mode enter ATV1X4 and press Enter.

When you dial again, the modem reports the call’s progress.

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

modem’s LINE jack (not the PHONE jack) and the phone wall jack. If the cable looks secure, try replacing it. If

that doesn’t work, the problem might be in your building’s phone installation. To test the building installation,

plug a phone into your modem’s phone wall jack and listen for a dial tone. If you hear a dial tone, your

modem might be installed behind a corporate phone system (PBX) with an internal dial tone that sounds

different from the normal dial tone. In that case, 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.

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

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

for an outside line.

● If you must dial 9, include it in the modem’s dial prefix to dial it automatically, for example,

ATDT9, (note the comma, which inserts a pause before the number is dialed). If you insert the 9, into the

dial prefix, you do not have to include it in each directory entry.

● To change the dial prefix in HyperTerminal, select Connect 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 there is no answer on the remote end, the modem reports NO CARRIER. You might have dialed a wrong

number and a person answered or you might have dialed the correct number but the other computer or

software was turned off or faulty. Check the number and try again or try calling another system to make sure

your modem is working. Try calling the number on your phone. If you hear harsh sounds, then another

modem is answering the call, and the modems might be having problems negotiating because of modem

incompatibilities or line noise. Try connecting at a lower speed.

● Poor line conditions can affect the connection. When using V.34 or V.32 client-to-client connections in poor

conditions, setting S38=0 may result in better performance.

Modem Disconnects While Online

● If you are not using modem on hold, call waiting can interrupt your connection when someone tries to call

you. If you have call waiting service, disable it before each call. In most phone areas in North America, you can

disable call waiting by preceding the phone number with *70 (verify this value with your phone company).

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