A set of parameters for the associated protocolDirID.
See the associated RMON2 Protocol Identifiers document
for a description of the possible parameters. There
will be one octet in this string for each sub-identifier in
the protocolDirID, and the parameters will appear here in the
same order as the associated sub-identifiers appear in the
protocolDirID.
Every node in the protocolDirID tree has a different, optional
set of parameters defined (that is, the definition of
parameters for a node is optional). The proper parameter
value for each node is included in this string. Note that the
inclusion of a parameter value in this string for each node is
not optional. What is optional is that a node may have no
parameters defined, in which case the parameter field for that
node will be zero.