PSA / PVA Installation Guide
December 4, 2019
Sifos Technologies
Page 7
The
THRU
(or
OUT
) ports may be connected to an analyzer used for packet flow or LAN physical layer testing,
such as the Sifos PVA-3000. These ports are DC-decoupled from the PSE ports meaning they do not experience
PoE DC voltages. They are passively coupled and therefore add no packet latency and negligible physical layer
impairment to LAN signaling including 10Base-T, 100Base-Tx, 1000Base-T, and 2.5GBase-T.
When a test port is configured to emulate PoE LLDP with a PSE, the 10/100 data pairs of the
THRU
(or
OUT)
port
will not be coupled to the
PSE
port. In fact, the LLDP connection in a test port may be used to block cross-coupling
of low frequency PoE signals between
PSE
ports in commonly used “snake” test setups.
NOTE!
Sifos generally recommends not connecting any devices to the
THRU
(or
OUT
) socket when running certain
PSE Conformance Tests that are sensitive to EMI termination methods or the presence of any electrical signaling at
the
THRU
(or
OUT
) socket.
Note that on the
PSA-3402
and
PSA-3002
, the two test ports are side-by-side with
Test Port 1
(
OUT 1
and
PSE 1
)
on the left and
Test Port 2
(
OUT 2
and
PSE 2
) on the right.
See the Technical Reference Manual for further information concerning the internal architecture and the LED
indicator features of each PowerSync test port.
10/100/1000BaseT LAN Port Testing with the PVA-3000
The
PhyView Analyzer
(PVA) is designed to perform in-depth physical layer testing of IEEE 802.3
10/100/1000BaseT LAN interfaces. The instrument is highly unique in that it can assess transmitted signal qualities,
receiver performance, and interface RF characteristics while linked to any DUT, that is, any 10/100/1000BaseT port.
Measurements and testing of physical layer performance is fully automated requiring no external equipment or
fixtures.
PVA test blades can share a PSA-3000 or PSL-3000 chassis with
any of the PoE test blades described above. In fact, PVA test
blades can be used in tandem with PoE (PSA) test blades to
assess physical layer performance characteristics on powered
PSE ports!
2.2.3.
Connecting Ethernet Ports to PVA-3102 Test Ports
Each test blade has one pair of RJ-45 sockets
per test port
. Test
port
1
and test port
2
are clearly labeled on the faceplate (
see
Figure 2
). The upper socket on each test port is labeled
THRU
and the lower socket is labeled
TEST
.
Device-Under-Test (DUT) ports need to be connected to the
TEST
sockets. The
THRU
sockets can be passively coupled to
the
TEST
sockets depending upon the test port configuration.
When connected accordingly, 10/100/1000BaseT LAN traffic
will flow between the
TEST
socket and the
THRU
socket. This
is a passive connection with DC-decoupling.
Normally, when performing physical layer testing, the
TEST
socket is
not
coupled to the
THRU
socket. Instead, all four wire
pairs are electrically switched to an internal diagnostic transceiver that gets linked to the DUT. However, certain
types of DUT receiver testing might be done by routing external packet generators/analyzers through the PhyView
Analyzer test port in order to utilize programmable passive channel impairments that available in the test port. In this
case, the external packet analyzer would be connected to the
THRU
socket.
Note that on the
PVA-3002
, the two test ports are side-by-side with test port
1
on the left and test port
2
on the right.
See the Technical Reference Manual for further information concerning the internal architecture and the LED
indicator features of each PhyView Analyzer test port.
2.2.4.
Power-over-Ethernet PD LLDP Testing
The
PDA-LLDP
is designed solely for assessing PoE LLDP protocols while testing an IEEE 802.3at compliant
Powered Device (PD). Typical configurations and hook-ups for performing this type of testing is provided in the
PDA-LLDP Technical Reference Manual.
Figure 2
. PVA-3000 Connections
