Multitech MultiModem MT5634ZBA-V-V92 Podręcznik Użytkownika Pobierz pdf (Strona 25)

Chapter 7 – Troubleshooting

Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide (S000286H) 25

o 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 before the number is dialed. By inserting 9, into the dial

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

o To change the dial prefix in Windows 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 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 the 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

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.

The 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 telephone areas in North America, you can disable Call

Waiting by preceding the telephone number with *70 (but first check with your local telephone company).

● You can automatically disable Call Waiting by including the disabling code in the modem’s dial prefix (e.g., ATDT*70, –

note the comma, which inserts a pause before the number is dialed). To change the dial prefix in Windows

HyperTerminal, select Connect from the Call menu, click Dialing Properties, check This location has Call Waiting,

and select the correct code for your phone service.

● If you have extension phones on the same line as your modem, you or someone else can interrupt the connection by

picking up another phone. If this is a frequent problem, disconnect the extension phones before using the modem, or

install another phone line especially for the modem.

● Check for loose connections between the modem and the computer, the telephone jack, and AC power.

● You might have had a poor connection because of line conditions or the problem might have originated on the other end

of the line. Try again.

● Your ISP might have hung up on you because of lack of activity on your part or because you exceeded your time limit for

the day. Try again.

Modem Cannot Connect When Answering

● The default DTR Control command (&D2) inhibits autoanswer. To enable autoanswer, change DTR Control to &D0, and

make sure &Q0, &Q5, or &Q6 is also set. For more information, see the &D command in the AT Commands Reference

Guide. For information on changing the modem’s default configuration, see “Install and Configure Your Software” in

Chapter 2.

● Autoanswer might be disabled. Turn on autoanswer in your communications program or send the command ATS0=1

(ATS0=2 if you have Caller ID service) to your modem in terminal mode.

● Telephone line is not functional or is connected to PHONE jack and should be connected to the LINE jack.

File Transfer Is Slower Than It Should Be

● If you are using a slow transfer protocol, such as Xmodem, try Zmodem or Ymodem/G instead.

● Is your line noisy? If there is static on your line, the modem has to resend many blocks of data to ensure accuracy. You

must have a clean line for maximum speed.

● Are you downloading a compressed file with MNP 5 hardware compression enabled? Since hardware data compression

cannot compress a file already compressed by an archiving program, the transfer can be marginally slower with data

compression enabled than with it disabled.

● Does your Internet service provider (ISP) use the same 56K protocol as your modem? The default setting of your modem

is to connect using either the V.92 or the V.90 protocol, depending on which one the ISP’s modem is using. If your ISP

uses the V.90 protocol, the maximum speed you will be able to upload at is 33,600 bps. Check with your ISP to see which

protocols it supports.

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