The value of tMacFilterParamsHighISID specifies the highest value of
the 24 bit (0..16777215) service instance identifier for this service
that matches this entry.
The default value of -1 indicates no ISID matching will be performed.
The value of this field can be equal to but not higher than the value
of the tMacFilterParamsLowISID field.
Changing the value of this field might also change the value of
tMacFilterParamsLowISID:
A value of -1 will change the value of tMacFilterParamsLowISID to -1.
Changing the value of this field from -1 to any other value will change
the value of tMacFilterParamsLowISID to this same value.
Note that tMacFilterParamsLowISID and tMacFilterParamsHighISID can only
be set if tMacFilterType is set to 'isid(1)'.