9-14-93
                    Guard tones are used in some European countries. It  is
a  tone (with the carrier) which disables echo-suppressors in  the  central
office.  These are never needed in the US. Some Zoom 2400 modems have  this
feature.  check your modem manual.
&G0  - no tone, default.    &G1  - 550 Hz tone.       &G2  - 1800 Hz tone.

                                   Don Hinds - Zoom Tech

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