JDS Uniphase IP Video Test Option HST-3000, Руководство пользователя

Страница: 313 / 356

Appendix A Test Results
Streams results
HST-3000 Ethernet Testing User’s Guide
291
Lost Frames A count of lost Acterna test frames for
the stream. For example, if the HST
detects sequence numbers: 1, 2, 3, 6,
7, 8, (frames 4 and 5 were not
detected), the lost frame count is incre-
mented by two (frames 4 and 5 are
lost). If the HST then detects sequence
numbers 9, 10, 14, 15, 16 (frames 11,
12, and 13 are missing), the lost frame
count is incremented by three, resulting
in a total count of five lost frames.
NOTE: If the HST receives errored
frames containing errors in the
sequence number field, the Lost
Frames count will be incorrect.
OoS Frames A count of each instance where the
HST detects out of sequence Acterna
test frames in the stream. For example,
if the HST detects sequence numbers:
1, 2, 3, 6, 7, 8, (frame 6 is detected
immediately following frame 3), the out
of sequence count is incremented by
one, resulting in a count of one instance
of out of sequence frames. If the HST
then detects sequence numbers 9, 10,
14, 15, 16 (frame 14 is detected imme-
diately following frame 10), the out of
sequence number is incremented again
by one, resulting in a total count of two
instances of out of sequence frames.
Packet Jitter, Avg
(us) The smoothed average value of the
packet delay variation for the stream
since the last test restart (per RFC
1889), calculated in microseconds.
Packet Jitter, Max
Avg (us) The maximum Packet Jitter, Avg (us)
measured for the stream since the last
test restart, calculated in microseconds.
Table 33 Streams test results (Continued)
Result Description