VeEX MPA User Manual page 729

MPA_e_manual_D07-00-129P_RevA00
Protocol Tabs
Errors
Alarms
Latency
Jitter
First, Prev, Next,
Last
Results - Event Screen
729
Displays Error statistic as Counts, Errored Seconds,
Average error rate and Current error rate, for the following
Error Types:
•
Sequence Errors - Each sent packet is marked with a
sequence number. This count is incremented when a
packet arrives that has a sequence number different
than one plus the sequence number of the previous
packet. This can be the result of packets being
received out of sequence, or due to packets being
dropped.
•
Bit Errors Received
Displays Alarm statistics as total number of Seconds the
alarm was active during the test, for the following Alarm type:
•
Pattern Sync
Displays Minimum, Average, and Maximum latency (delay)
measurements, in microseconds (µs).
A latency measurement is taken every quarter-second (0.25
sec.) during stream transmission. These values are updated
(real-time) as new latency measurements are logged.
If the TX and RX are looped on itself with a short patch
cable, the latency may appear as 0 µs.
Displays Minimum, Average, and Maximum frame delay
variation (Packet Jitter) measurements, in microseconds
(µs).
A Packet Jitter measurement is taken every quarter-second
(0.25 sec.) during stream transmission. These values are
updated (real-time) as new Jitter measurements are logged.
If the TX and RX are looped on itself with a short patch
cable, the latency may appear as 0 µs.
Allows the user to scroll through all of the packet streams and
view their individual results. Selecting First immediately
moves the stream statistics to Stream 1; selecting Last
immediately moves the last stream's statistics; selecting Prev
or Next moves the stream statistics to/from one stream
immediately before or after the currently selected stream.