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&F
Restore Factory Configuration (Profile)
The modem loads the factory default configuration (profile). The factory defaults are identified for each command and
in the S-Parameter descriptions. A configuration (profile) consists of a subset of S-Parameters.
Syntax
&F[<value>]
Defined Values
<value> Decimal number corresponding to the selected configuration.
0 Restore factory configuration 0.
1 Same as 0; allowed for compatibility.
Result Codes OK
ERROR If the modem is connected
&T
Local Analog Loopback Test
The modem will perform the local analog loopback test if &T1 is selected. The test can be run only when in an
asynchronous operation in non-error-correction mode (normal), e.g., AT&Q6. To terminate the test in progress, the
escape sequence must be entered first.
Syntax
&T[<value>]
Defined Values
<value> Decimal number corresponding to the selected option.
0 Terminates test in progress. Clears S16.
1 Initiates local analog loopback, V.54 Loop 3. Sets S16 bit 0. If a connection exists when this command is issued,
the modem hangs up. The CONNECT XXXX message is displayed upon the start of the test.
**
Load to Internal RAM
This command allows the internal SRAM to be loaded with patch code for minor firmware upgrade including country
profile customization. This process transfers the S37 file from the host computer to the modem. The data transfer is
done via an ASCII transfer. A successful upload can be verified by invoking ATI3 and/or ATI4 command depending
on which of the two were modified. The patch is erased when the power is turned off.
Procedure
1. Configure the communications application program for a DTE rate of 115200 bps.
Check the modem for response by typing AT.
2. Issue AT** command to initiate the download process. The following message appears:
Download initiated.
3. Send the patch code (e.g., patv00028.s37). The following message appears on successful upload:
Modem Firmware Successfully Loaded
Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer's Guide
Chapter 4 - V.22bis Commands
14
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