This attribute specifies whether a 16 bit or a 32 bit Frame Check
Sequence (FCS) will be used for the link between the IWF and the
far end DCE. This attribute has one of the following values:
fcs16: Use only a 16 bit FCS.
fcs32Or16: 32 bit FCS is preferred; Use a 16 bit FCS if needed.
fcs32Only: Use only a 32 it FCS; If unavailable, drop the
connection.