netAlly EtherScope nXG Controlled Edition, User Manual

Page: 679 / 795

Upstream Target Rate
: This is the requested
rate of upstream traffic, from the source to the
endpoint.
Downstream Target Rate : This is the requested
rate of downstream traffic, from the endpoint
to the source.
NOTE: The 99.98 Mbps and similar values
provided in the Target Rate options are
meant to test the maximum, worst case
throughput on an Ethernet link. Though
greater rates are possible under perfect con-
ditions, the limitation of 99.98% of the link
rate results from asynchronous clocks in
Ethernet. The IEEE 802.3 Ethernet standard
allows link partners to differ by up to 0.02%
of their clock signals. Therefore, end-to-end
throughput in the worst case may be
limited to 99.98% of the source link rate
when the traffic traverses a link and
maximum clock differences occur between
the two link partners.
Thresholds
Thresholds define the Pass / Fail criteria the
EtherScope uses to grade the test. The
Performance Test App
679