Multi-Tech Systems MT3334HD8 manual RDn Square Wave Ring Detect, $Tn Calling Tone

3 AT Commands

&P1 sets a pulse dial ratio of 67 ms break to 33 ms make.

&RDn Square Wave Ring Detect

n = 0 or 1

Default: &RD0 (U.K. and International models) &RD1 (North American models)

The ring back sound that you hear when you dial a number is generated at the local telephone office or PBX. Normally, it is a sine wave analog tone. However, some PBXs generate square wave rings that can go undetected by normal ring detection circuits, resulting in a failure to make a connection. To enable your modem to detect square wave rings, use the &RD1 command.

&RD0 enables sine wave ring detection only.

&RD1 enables sine wave and square wave ring detection.

$Tn Calling Tone

n = 0 or 1 Default: $T1

The $T command enables or disables the modem’s calling tone, which is required by some European countries to identify the caller as a modem.

$T0 enables the calling tone.

$T1 disables the calling tone.

#Tn Trellis-Coded Modulation

n = 0 or 1 Default: #T1

The #T command enables or disables trellis-coded modulation (TCM) on the modem. There is usually no need to disable TCM, except for an unusual line condition called impulse noise.

#T0 disables TCM.

#T1 enables TCM.

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