Calnex Sentinel - Page 32

Using Sentinel
CX3001 v7.0 © Calnex Solutions 32
calnexsol.com |
Band selection is a selection of packets which are inside a range (defined by percentiles) of window packets
sorted out by delay value. For example, range 0%-25% means selection of quarter of fastest packets (with
lowest delay values).
Cluster range selection method is a selection of packets which are inside a range of current minimum delay
parameter to current minimum delay + given range. Range value is given by user and is constant during the
measurement. Current minimum delay is determined depending of settings of Minimum delay detection
component.
Minimum delay detection
Minimum delay detection parameter affects lower edge of cluster range interval and can be one of the
following:
Custom
Constant minimum delay entered by user is used
Auto for last
Minimum delay is automatically determined by packet delays received for last given amount of
time
Auto for session
Minimum delay is automatically determined as lowest delay packet ever received during
measurement
Selection masks settings
User can enter FPP mask level. FPP mask for a particular Packet module is considered failed if at least one of FPP
sample is below mask level. Otherwise it is considered a pass.
PDV Distribution
Different PTP slave vendors have their own specification for PDV distributions for their PTP slave to work
correctly. This PDV distribution function allows the user to set a vendor specific specification so that Sentinel can
be used to compare the measurement results against vendor specification for pass/fail test.
Mask Type
Different ways to define the mask, either by range or by tolerance. When Range is
selected, it is possible to set the required mask by min/max delay values. When Tolerance
is selected, the mask can be set around a nominal value