Sifos Technologies PowerSync PSA100, Technical Reference Manual, Page: 144 / 147

PowerSync Analyzer Reference Manual
March 9, 2010 Sifos Technologies page 144
at a particular outlet when power demands or other intermittent transitions are exceeding total output power capacity
across a range of PoE served devices. Line Monitor Test Reports can be saved to a time-date stamped text file (see
Figure 9.5) upon test completion.
9.4. Visual PoE Analysis
Another unique feature of the Sifos
PoE Service Analyzer
is the ability to produce
graphical waveforms
of controlled
PoE events. These waveforms can be useful for observing problem behaviors.
Two
Power-Cycle
waveforms are included to observe the full cycle of an ordinary PoE power-up and PD disconnect
power-down captured over a 5 second time interval. One waveform looks at line voltage while the other records
electrical current flow. Both can be configured to run with PD
Class 1
,
Class 2
, or
Class 3
emulation. Users with
very moderate understanding of PoE technology can observe and analyze
detection signaling
,
classification signaling
,
the
powered line state
, and PSE response to a
PD disconnect
.
Two additional waveforms available are
Disconnect Shutdown
and
Overload Shutdown
. These waveforms may
utilized to visualize the PD service outlet response to either a PD disconnect or a PD transient overload condition. Both
conditions should result in power removal in order to prevent damage to network devices when plugged into
the service outlet. The disconnect shutdown should occur in
approximately a half second while the overload shutdown should
occur in less than one tenth of a second, regardless of PD
Classification selected.
Following waveform capture, waveforms may be printed or
imported to Microsoft Excel for further analysis as shown in
Figure 9.7.
Figure 9.7
Voltage Cycle Waveform - Excel
PoE Power Cycle - Voltage
PoE Power Cycle – Current (Class 3 PD)
PoE PD Disconnect Shutdown
PoE PD Overload Shutdown
PoE Power Cycle - Voltage
PoE Power Cycle – Current (Class 3 PD)
PoE PD Disconnect Shutdown
PoE PD Overload Shutdown
Figure 9.6
PoE Service Analyzer Waveforms