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The NVRAM does not require a back up battery so that you can
eliminate the threat of data loss due to a dead battery, as well as
avoid hardware damage due to electrolyte leakage.
2.10 Factory Default Profile (FDP)
The FDP is the default configuration profile stored in your modem
read-only memory (ROM), which can not be modified by the user.
The FDP is intended for rescuing the modem in case the user
misconfigures the modem settings.
To display the FDP, use command &F to place the profile into the
active configuration area (ACA), then issue AT&V. Note that some
modems may have more than one built-in FDP; in which case,
each FDP serves as the default for a particular application
requirement.
2.11 Stored Configuration Profile (SCP)
The SCP is the configuration profile stored in the NVRAM of the
modem to be retrieved for later use.
Initially the factory sets the SCPs identically to the FDPs. To view
all the SCP configurations, issue command &V. note that once an
SCP is selected and loaded into ACA, it becomes the major SCP
and provides the control characteristics of the modem.
If you hav edited the ACA and wish to write it to an SCP, issue a
&W command. The modified configuration profile overwrites the
original SCP and becomes the new SCP.
For information on the SCPs of your particular modem, refer to
your Getting Started manual.
2.12 Major Stored Configuration Profile (Major SCP)
The major SCP is the SCP that is loaded into the ACA each time
the modem is turned on or reset by ATZ. To designate an SCP as
the major SCP, issue &Y followed by the SCP number. For
example, issuing &Y1 designates SCP1 as the major SCP.
2.13 Active Configuration Area (ACA)
The ACA is a portion of the random-access-memory (RAM) in your
modem that holds the configuration settings that determine the
modem current operating characteristics.