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Maintenance Object Repair Procedures
555-233-123 10-562 Issue 4 May 2002
If the nonvolatile memory fails with power still present, the terminal will revert 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
will revert to its factory default settings.
Mu-law companding is assigned as a default setting at the factory, so, for
domestic use, a programmable terminal can place calls even though it has not
been downloaded from the PBX.
Download Actions
There are several different scenarios that will cause a terminal to be downloaded.
As described below, these can occur as part of background maintenance activity
or on demand from the System Access Terminal or from a station.
For the background actions described below, the terminal will be downloaded
automatically if a download retry flag for the terminal is set in software. This flag is
set at the time translation is loaded at boot time, when translation which affects
the parameters of a terminal is changed as part of system administration actions,
and when a port is inserted in software as a result of board insertion or translation
change.
Automatic Download Actions
1. 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.
2. 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 because it was off-hook at the time the
system first booted or because the terminal was off-hook at the time
translation associated with downloadable parameters was changed.
Note that it may take more than an hour for periodic tests to reach the
terminal that needs to be downloaded.
3. Terminal Administration
A downloadable terminal is automatically downloaded when translation
changes associated with downloadable parameters are made as part of
system administration. As shown in Table 10-128, these changes can be
for a specified terminal or may be system-wide. If the change is for
system-level parameter, a background global update request is made to
download all programmable terminals.
This global update may take more than an hour for a system with several
thousand programmable terminals.