The CHARM manual can be obtained free of charge as an Adobe
Acrobat® download from the non-OGP publications part of the OGP
website. It is the only definitive source of the algorithms that
form the CHARM model.
The regulator considers that it is vital that people working
with any version of the model should be familiar with its contents.
In the regulator's view, it is essential that users have some
understanding of the underlying principles of the model in order to
make full use the new software.
EOSCA have developed the Excel tool - the CHARM calculator. This
helpful tool can be used to quickly interpret the written
algorithms. Initially, users should familiarise themselves with the
written CHARM manual. Then they should input some of the algorithms
into the Excel spreadsheet to see more clearly how the algorithms
interact. Once those interactions are clear, the CHARM calculator
and the written algorithms can be "creatively manipulated" to
generate meaningful risk-assessment data to support future PON
applications.