Indicates the Paths which are available to this Port. In the
absence of faults, the A & B ports will always have both the
Primary & Secondary paths available.
The value is a sum. This value initially takes the value 0,
then for each type of PATH that this port has available, 2
raised to a power is added to the sum. The powers are according
to the following table:
Path Power
---- -----
Primary 0
Secondary 1
Local 2