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

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Appendix A Test Results
Error Stats results
HST-3000 Ethernet Testing User’s Guide
301
FCS Errored
Frames A count of Ethernet frames containing
Frame Check Sequence (FCS) errors.
When receiving Ethernet jumbo frames
containing FCS errors, the FCS error
count does not increment. Instead,
these frames are counted as Jabbers.
Frame Loss Ratio The ratio of frames lost to the number
of frames expected.
IP Checksum Errors A count of received IP packets with a
checksum error in the header.
IP Packet Length
Errors A count of received IP packets that
exceed the available Ethernet payload.
Jabbers A count of received frames that have a
byte value greater than the maximum
1518 frame length (or 1522 bytes for
VLAN tagged frames) and an errored
FCS.
L4 Checksum Errors A count of received layer 4 frames with
a checksum error in the TCP/UDP
header.
Lost Frames A count of lost Acterna test frames. 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 incremented 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.
Table 37 Error Stats test results (Continued)
Result Description