Multitech MT9234ZPX-UPCI User's Guide download pdf (Page 21)

Appendix A - Troubleshooting

MultiModem ZPX UPCI/PCIe User Guide 21

● Include the call waiting disabling code in the modem’s dial prefix, for example, ATDT*70, (note the comma,

which inserts a pause before the number is dialed). To change the dial prefix in 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 and the phone jack.

● 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.

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 insure

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.

● Are you trying to send a file to another client modem? If so, then your maximum possible connect speed is

33,600 bps. You can upload at speeds up to 48,000 bps only when connected to an ISP that supports the V.92

protocol.

● Try entering the I11 command in online mode or the &V command in command mode to display information

about the last connection, making a screen print of the connection statistics, and checking for parameters that

might be unacceptable.

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Multitech MT9234ZPX-UPCI User's Guide Page 21