If wfSRsvpSenderAdspecCLSvc is TRUE, this
is the service-specific override of the minimum
path latency general characterization parameter
from the ADSPEC. A return of zero or noSuch-
Value indicates one of the following condi-
tions:
the invalid bit was set
the parameter was not present
If wfSRsvpSenderAdspecCLSvc is FALSE, this
returns zero or noSuchValue. UNITS, microseconds