def __init__(self, usecsma=True, **kwargs):
"""Constructor."""
# create ARF parameters
self.nsuccess = None
self.nfailure = None
self.timeout = None
self.ackcount = {}
self.arftimer = {}
self.probation = {}
self._rates = None
# create ARF events
self.dropack = SimEvent()
self.recvack = SimEvent()
DCF.__init__(self, usecsma=usecsma, **kwargs)
# update event names
self.dropack.name = "%s%s"%(self.name, ".dropack")
self.recvack.name = "%s%s"%(self.name, ".recvack")
def __init__(self, usecsma=None, **kwargs):
"""Constructor."""
self.thresh = None
self._rshduration = None
DCF.__init__(self, usecsma=False, **kwargs)