3Com 56K Problems that Occur After Connecting, Your screen displays random or garbage characters

15-4CHAPTER 15: TROUBLESHOOTING

Problems that

Occur After

Connecting

Your screen displays random or "garbage" characters

Make sure that the Business Modem is set to the same bit rate, word length, parity, and number of Stop bits as the device to which you are connecting.

If the settings are correct, the problem may be with the phone line. Try the following measures:

■Place the call again. The phone company routes even local calls differently each time you call.

■Call a different device to see if the problem persists. The problem may be with the device you first tried to call.

If the modem is set to a fixed serial port rate (&B1) and your software is fixed at 19.2K, 38.4K, 57.6K, or 115.2K bps, the reason may be one of the following:

■Your computer may not support the higher serial port rate. If this is the case, fix your software rate at 9600 bps.

■If you use memory-resident programs (TSRs-Terminate and Stay Resident programs) or disk-caching programs, they may be interfering. Try disabling them before you run your communications software.

■Check that your software and the Business Modem are set for the same kind of flow control, either hardware or software. Some communications programs also require that you disable the type you are not using.

Many CRC errors ■ Send AT&F1 to enable hardware flow control and other optimized settings.

■Try a different file transfer protocol (use ZMODEM if it's available to you)

■If you use memory-resident programs (TSRs-Terminate and Stay Resident programs) or disk-caching programs, they may be interfering. Try disabling them before you run your communications software.