3Com 56K manual Mainframe computer keeps dropping your connection

Problems that Occur After Connecting 15-5

Mainframe computer keeps dropping your connection

You must turn off the Business Modem's result codes and character echo (ATQ1E0). The modem at the mainframe also needs to be set to ATQ1E0.

Bad faxes or can't fax ■ Make sure the fax software is set to use Class 1 fax. Refer to your fax software's manual.

■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.

Both devices exchange carrier signals, but fail to establish a communications link

■Make sure the Business Modem is in the correct mode, fax or data, depending on whether the connection is to be made with a facsimile device or a data device.

See Chapter 2, Modes of Operation, for information on switching between Fax and Data modes.

■Make sure the proper bit rate, word length, parity and number of Stop bits have been selected.

■Send ATI4 and check to see that your modem is at the correct Bn setting to connect with either an HST modem (B1 setting) or “V.” modem (B0 setting).

■Make sure that your Business Modem's connection rate setting, &Nn, is correct for the call. If the connection rate is locked at a speed (&N1-&N14) different from the calling modem's, the Business Modem hangs up. The default setting of &N0, variable link operations, allows the two modems to negotiate the highest possible connection rate.

■If your modem is attempting to answer a V.32 call, you may need to lengthen the extra V.32 answer tones. See Appendix B, Alphabetic Command Summary, under S28.