VeEX MPA, User Manual

Page: 633 / 842

Protocol Tabs
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2. When testing lo
w speed Ethernet bandwidths (≤ 1Gbps), you may need to
configure the Resolution setting in conjunction with the Consecutive Bad Time
Required setting, to ensure that at least one Ethernet packet is received within
the configured period of time (measurement window). The following options are
available:
High (.1 ms), Medium (1 ms) and Low (10 ms) .
When receiving fewer packets per second (lower bandwidths), a lower
resolution setting (larger window of time) is required.
Invert the number of packets per second being received to determine the
time between each received packet, and select the Resolution setting that best
allows for at least packet to be received within the selected measurement
window.
Important: The Resolution setting is only displayed on ports that support
Ethernet rates ≤ 1Gbps.
3. Select Consecutive Good Time Required and enter a time interval ranging
from 10 milliseconds to 1638.3 milliseconds. This function allows you to enter the
time-duration (in milliseconds) of consecutive error-free frames to elapse before
Protection Switch measurements stop accumulating.
4. Select Consecutive Bad Time Required and enter a time interval ranging from
0.1 milliseconds to 1638.3 milliseconds. This function allows you to enter the
time-duration (in milliseconds) of consecutive errored frames (or no frames) to
elapse before Protection Switch measurements begin to accumulate.
5. From the Action box, select State . The Select APS Action dialog box appears.
6. Select Single APS or Continuous APS to begin measuring. The test set will
begin monitoring the incoming signal for the event. If it occurs, the protection
switch state and time will appear in both seconds and frames present. The
results will not include the number of good frames, but the number of errored
frames that occur before the first good frame. This is based on the previously
selected criteria for consecutive good and bad time parameters.
7. In the Protection Switch Time (MilliSecs) table, view the duration, in
milliseconds, that it took for the service disruption to occur.
8. In the History Recent MilliSeconds table , view a history of the 10 most recent
measurements.
9. The complete summary of service disruption events for all processors within the
test unit can be viewed simultaneously by selecting the System tab and
choosing Service Disruption .
MPA_e_manual_D07-00-129P_RevA00