This variable is the T_Req_value passed to the MAC. Without
having detected a duplicate, the time value of this variable
shall assume the maximum supported time value which is less
than or equal to the time value of wfFDDIMacTReq. When a MAC
has an address detected as a duplicate, it may use a time
value for this variable greater than the time value of
wfFddiPathTMaxLowerBound. A station shall cause claim when the
new T_Req may cause the value of T_Neg to change in the claim
process (i.e., time value new T_Req < T_Neg, or old T_Req =
T_Neg). This value is encoded in nanoseconds. The name of
this attribute in the IETF MIB is FddiMibMACTReq.