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DIG-LINE (Digital Line)
Issue 1 June 2005 929
Nonvolatile Memory
Nonvolatile memory stores downloadable parameters in programmable terminals. Once the
terminal is downloaded, it is not be necessary to download it again, even if power is removed
from the terminal. If nonvolatile memory fails with power still present, the terminal reverts to its
default factory settings except for its A-law/mu-law companding settings which are stored in
RAM. If power is removed after the nonvolatile memory fails, the terminal reverts to its factory
default settings.
Note:
Note: The mu-law companding mode is assigned as a default setting at the factory. For
the United States, a programmable terminal can place calls even though it has
not been downloaded from the system.
Download Actions
There are several different scenarios that cause a terminal to be downloaded. These can occur
as part of background maintenance activity or on demand from the system access terminal or
from a station.
For the following background actions, the terminal downloads automatically if a download retry
flag for the terminal is set in software. This flag is set:
● At boot time when translation is loaded
● When translation that affects the parameters of a terminal is changed as part of system
administration action
● When a port is inserted in software as a result of board insertion or translation change
Automatic Download Actions
This section describes download actions that occur automatically.
System Reboot/Restart
A global download action is started when periodic maintenance tests start after a system
reboot/restart regardless of whether the parameters have been downloaded previously.
Periodic Tests
If the download flag is still set when periodic tests are run on a terminal, a download action
will occur. This operation is required in case a terminal could not be downloaded previously
either:
● Because it was off-hook at the time the system first booted
● Because the terminal was off-hook at the time translation associated with downloadable
parameters was changed