Administration and Provisioning
8-2 Issue 8.0 July 2002
There are two complete copies of executable code in the system under normal
conditions. One complete copy of executable code is located in the nonvolatile
memory of the System Memory (SYSMEM) circuit pack. The other copy is
distributed in the volatile memory of the System Controller (SYSCTL), the Line
Controller (LNCTL) circuit packs, the Overhead Controller - Terminal [OHCTL
(TERM)] circuit pack, and the individual board controllers on the other circuit
packs. The system executes the copy in the board controllers and the SYSCTL,
LNCTL, and OHCTL (TERM) circuit packs.
There are three sets of data in the system under normal conditions:
â– Two sets of data are located in the nonvolatile memory of the SYSMEM
circuit pack.
— One set contains the system parameters and their original values
(value assigned to a parameter at the factory).
— The second set contains the system parameters and their current
values (values currently being used by the system).
â– The third set of data is located in the volatile memory of the SYSCTL,
LNCTL, and OHCTL (TERM) circuit packs, plus the board controller of the
other circuit packs. This set contains the system parameters and their
current values.
If the system loses power and then regains power, the executable code and the
data (with current values) are copied from the nonvolatile memory in the
SYSMEM circuit pack to the volatile memory in the SYSCTL circuit pack. The
system then starts running the executable code.
If the SYSCTL circuit pack is replaced, the executable code and data (with current
values) are copied from the nonvolatile memory in the SYSMEM circuit pack to
the volatile memory in the SYSCTL circuit pack. The system then starts running
the executable code.
If the SYSMEM circuit pack is replaced and the executable code in the new
SYSMEM circuit pack is different from what is running in the SYSCTL circuit pack,
one of the following functions can be performed:
â– Load another copy of the currently running version of the executable code
from the craft interface terminal (CIT) to the SYSMEM circuit pack.
â– Restart the system with the version of executable code in the new
SYSMEM circuit pack.
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