Newsletter, Volume XIV, May 2015
PSA 4.1 Software Release
It's been almost 3 years and close to 20 sub-releases of
PSA software since the PSA 4.0 software release. LOTS HAS
HAPPENED SINCE THEN!
The PSA 4.1 software release includes significant
enhancements and improvements to all major feature sets of the
PhyView Analyzer (PVA), PowerSync Analyzer (PSA), PowerSync
Programmable Load (PSL) and PDA-LLDP test instruments. The new
software also incorporates a whole new Multi-Port Test Suite for
802.3at PSEs and new graphical user interfaces to perform
pre-standard 4-pair PSE testing and analysis.
Feature improvements and enhancements include:
Conformance Test Suite for the PSA; well
over 100 enhancements and specification coverage improvements
since the PSA 4.0 software release. New, more informative
Performance Test Suite for the PVA; well
over 40 enhancements and refinements since the PSA 4.0
software release. New, more informative standard
report. Improved DC Unbalance Analysis with
new standard spreadsheet report.
more accurate PSE
LLDP Emulation & Analysis for the
PSA-3XXX / PSL-3XXX with improved spreadsheet report.
more accurate PD
LLDP Protocol Emulation & Analysis for
the PDA-LLDP with improved standard spreadsheet report.
All Sifos Product Manuals and associated literature are
updated for PSA 4.1 software release and are available for download
from the Sifos website to registered users and active PSE Conformance
Test Suite Tracking Service customers who will also receive new
hardcopy PSA-30XX Manuals and CD's shortly.
PSE Multi-Port 2nd Generation Test Suite for 802.3at
With the 2nd generation PSE Multi-Port Test Suite, PSE
system evaluators can readily, that is a with a few mouse clicks,
discover answers to such questions as:
does PSE power management respond to multi-port
of Class N PD's and how does power management respond to multi-port LLDP
negotiations requesting full Class N power
levels? (N= 0, 1, 2, 3, or 4)
- How much time does it take for the PSE to apply power
to, and if applicable, complete LLDP power negotiation with Type-1
and/or Type-2 PD's?
much time does it take for the PSE to remove power given bulk PD
disconnects and how much time to restore power when PD's are
- How much continuous power can the PSE
furnish to all powered (and granted) Type-1 and/or Type-2 PD's? What
is the magnitude of over-allocated or under-allocated power to Type-1
and/or Type-2 PD's?
- How much power capacity is reserved for valid Type-1
and/or Type-2 PD load transients under
conditions of full and 50% static power consumption?
- How predictable is PSE port overload
shutdown criteria both as a function of PSE port and as a function of
total static power load to Class N PD's?
- How much time does it take for the PSE to remove power
given moderate PD overloads and how much time to restore power
following bulk overload shutdowns?
- How does PSE power management respond to differing
subsets of PSE ports experiencing a variety of Class N
- How stable is PSE power when operating at
95% of static power capacity over a prolonged period of time?
The 2nd generation Multi-Port Test Suite is simple to configure and
requires just a single cycle sequence all test conditions to Type-1
(15.4W) and Type-2 (30W) PSE's. New reporting is colorful with
graphs and tabular summaries that convey critical PSE system
4-Pair PSE Analysis with PSA/PSL Interactive GUI
With PSA 4.1 software, Sifos is introducing new menus
for PSA Interactive and PSL Interactive graphical user interface
software that enable flexible signature configuration, flexible
loading, user configured measurements, and standard waveforms for
pre-standard 4-Pair PSE's. The new menus allow users to:
· Configure detection and class signatures to Alt-A and/or
Alt-B pair-sets on a single port or on all ports.
· Effect both 4-Pair (Alt-A and Alt-B) and 2-Pair (Alt-A
or Alt-B) connections and disconnects on a single port or on all
· Emulate proprietary UPoE 4-Pair LLDP protocol to
negotiate power demand.
· Configure 4-Pair static power loads (in watts) on a
single port or on all ports.
· Perform immediate triggered or event-triggered DC
measurements of Voltage, Current, and Power on Alt-A and/or Alt-B
· Collect and analyze synchronous waveforms of port
voltage by pair-set and combined 4-pair waveforms of port current and
power (PSA-3XXX only).
· Produce single-button standard waveforms of detection
signaling, class signaling, power-up sequencing, static powering,
4-pair and 2-pair disconnect responses, and 4-pair and 2-pair
Using the new
4-Pair menus, users can readily emulate commonly found proprietary
4-Pair PD classes such as PoH (to 95 watts), Cisco UPoE (including LLDP and forced 4-pair modes), LT PoE++ (3 event). Other proprietary schemes can also be configured with
the 4-Pair menus.
features complement existing capability in PSA software to perform
Live PD Emulation under the Multi-Port Suite to emulate up to 96
4-Pair PD's using up to 8 PSA/PSL chassis'.
Improved 10/100/1000Base-T PHY Performance Testing
Much like the
PSE Conformance Test Suite, the PHY Performance Test Suite for the
PhyView Analyzer gains refinements as a growing base of customers
deploys it to evaluate an ever broadening set of 10/100/1000Base-T
interface technologies and devices. Since the original release
in PSA 4.0 software, the suite has experienced at least 40 distinct
enhancements and refinements to improve accuracy and to adapt to
unusual or unexpected interface behaviors. More specifically,
· Extended analyses in Basic Capabilities to better
recognize and address problems with auto-negotiation
that can potentially interfere with link-ups required for both
transmission and receiver testing.
· Enhanced coverage for potential auto-negotiation
problems; an area where traditional IEEE 802.3 testing is weak
· Minor enhancements in transmission measurements and
results processing to improve
accuracy and repeatability.
· Enhancements and refinements to receiver testing
including impairment magnitude selections and more
comprehensive handling of port-under-test reactions to impairments.
The new PHY Performance Test
Suite reporting template provides more extensive background on tests
and test parameters while implementing color schemes and graphics
that readily depict marginal and out-of-specification parameters.
Improved PSE Conformance Testing
Conformance Test Suite has made gains in test (or defect) coverage
and experienced numerous refinements to its adaptive logic
intelligence since the PSA 4.0 release. The over 100
· Revised or added conformance parameters to tests det_v,
det_time, pwrup_inrush, pwron_v, pwron_pwrcap and others.
· Reduced susceptibility to long latency connections
between PSA-3000 and host computer.
Improved accuracy and repeatability in tests such
as det_i, class_time, class_err, pwrup_time and others.
Adaptation to new PSA-3102 test port hardware versions
Improve test reporting and test limit derivation logic.
· New standard spreadsheet report with more complete and
accurate test parameter explanations and refined "Sifos
Interop" scoring calculation.
Since the PSA 4.0 release, the
PSE Conformance Test has been verified against many new PSE
Controllers including a number of second and third generation 802.3at
Improved PSE DC Unbalance Tolerance Assessment
& PD Ethernet Port Analysis
Ever wonder how PoE service impairs to 10/100/1000Base-T
Hopefully, it doesn't. However, reality is that
for reasons beyond a PSE port's control, DC unbalance can potentially
degrade LAN signaling integrity thus compromising link
performance. DC Unbalance can arise from asymmetrical wire
pairs, compromised RJ-45 connections and powered device magnetic
unbalance to name a few possible sources. PSE's must therefore
tolerate the phenomenon of DC unbalance where either outgoing DC
current and/or incoming DC current does not split evenly between wire
pairs. Most susceptible to DC unbalance are the Ethernet
magnetics in each PSE port.
DC Unbalance tolerance is an
extremely difficult assessment to perform. Sifos offers a
unique solution that combines PowerSync Analyzer (or Programmable
Load) ports with PhyView Analyzer test ports to produce fully
automated analyses of the impact in varying levels of DC Unbalance to
100Base-Tx and 1000Base-T signal quality. Measurements include SNR
(distortion), Low Frequency Response (attenuation) and Estimated
Pulse Droop resulting from compromised magnetics.
With the PSA 4.1 software
release, the fully automated DC Unbalance
test, as part of the PHY
Performance Test Suite, has been refined with improved measurements
and reporting. Also, a new PVA-DCU
module is introduced that, in concert with the PSA-3000 /
PSL-3000 test port, provides DC unbalance current on either Alt-A,
Alt-B, or both Alt-A and Alt-B pair-sets. Each PVA-DCU can
provide controlled DC unbalance to two links.
For those interested in assessing
Powered Device (PD) 10/100/1000Base-T interface performance, the PHY
Performance Test Suite can be run through a mid-span injector to
assess PD PHY performance. See Sifos application note Powered Device Ethernet Port Analysis
for further information.