Actiontec electronic V.90 ISA AT Commands for Testing and Debugging, Line-to-Line Loopback

AT Commands for Testing and Debugging

The following commands are to be used for testing and debugging only and are not meant for general use.

&&C	Write to/Read from DSP Register
	Command	Effect
	AT&&C<loc>-	writes the value <val> to DSP register at location <loc>.
	,<val>
	AT&&C<loc>	reads from location <loc>.
&&L	Line-to-Line Loopback

This command provides a loopback for line-to-line.

&&R	Write to/Read from DSP RAM Location
	Command	Effect
	AT&&R<loc>,-	writes the value <val> to DSP RAM location <loc>
	<val>
	AT&&R<loc>	reads from location <loc>
&Tn	Self-Test Commands

This command allows the user to perform diagnostic tests on the modem. These tests can help to isolate problems when experiencing periodic data loss or random errors.

Command	Effect
&T0	Abort. Stops any test in progress.
	Local analog loop. This test verifies modem operation,
	as well as the connection between the modem and
&T1	computer. Any data entered at the local DTE is
	modulated, then demodulated, and returned to the local
	DTE. To work properly, the modem must be off-line.
&T3	Local digital loopback test.
	Remote digital loopback test. This test can verify the
	integrity of the local modem, the communications link,
&T6	and the remote modem. Any data entered at the local
	DTE is sent to, and returned from, the remote modem.
	To work properly, the modems must be on-line with
	error control disabled.

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