...
+ If the packet fails to arrive within a reasonable period of time,
the one-way packet-loss is taken to be one. Note that the
threshold of "reasonable" here is a parameter of the methodology.
{Comment: The definition of reasonable is intentionally vague, and
is intended to indicate a value "Th" so large that any value in
the closed interval [Th-delta, Th+delta] is an equivalent
threshold for loss. Here, delta encompasses all error in clock
synchronization along the measured path. If there is a single
value after which the packet must be counted as lost, then we
reintroduce the need for a degree of clock synchronization similar
to that needed for one-way delay. Therefore, if a measure of
packet loss parameterized by a specific non-huge "reasonable"
time-out value is needed, one can always measure one-way delay and
see what percentage of packets from a given stream exceed a given
time-out value.}