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098-00208-000 Revision A – February, 2010
TimeAnalyzer 7x00 User’s Guide 107
Chapter 5 Analyzing
Analysis of PDV Measurements
As was the case for packetTDEV, the packetZTIE calculation is adjusted when
"Optimal" is selected. As before, the analysis in this "Optimal" case is a deeper look
into the packet delay data in an attempt to model network characteristics which in a
simpler analysis would be overlooked. In doing so, the packetZTIE calculation
result is improved, that is, the degradation represented by specific calculation points
is reduced from what it was when "Optimal" was unchecked.
Masks
There are six masks available for packetTDEV and packetZTIE analysis. They
cover application requirements ranging from synchronization interface
requirements, to traffic interface requirements, to wireless backhaul frequency offset
requirements.
Four of the masks apply to the packetZTIE calculation and two of the masks apply
to the packetTDEV calculation. These masks are described in
below:
Additional Analysis
The TimeMonitor PDV software stores data to files, and can plot packetTDEV and
packetZTIE along with masks for pass/fail checking. For further analysis, the
companion application TimeMonitor Analyzer can be used for importing, viewing,
and analyzing PDV data from files created by TimeMonitor PDV.
In addition, TimeMonitor Analyzer allows multiple measurements to be combined
onto a single plot using the plot overlay function. See the TimeMonitor Analyzer
User Guide for further details.
Table 5-1. Packet-domain Mask Descriptions
Mask
Description
TDEVSync.lmt
The packetTDEV mask associated with synchronization
interface requirements
TDEVTraffic.lmt
The packetTDEV mask associated with traffic interface
requirements
ZTIESync.lmt
The packetZTIE mask associated with synchronization
interface requirements
packetZTIETraffic.lmt
The packetZTIE mask associated with traffic interface
requirements
ZTIEWireless01.lmt
The packetZTIE mask associated with wireless backhaul 1
PPB frequency offset requirement
ZTIEWireless15.lmt
The packetZTIE mask associated with wireless backhaul 15
PPB frequency offset requirement