PVA-3000 Reference Manual
December 2, 2019 Sifos Technologies
In-Line Quad Line Impairment Module
Channel 1: -14 dB wideband return loss on each of 4 pairs
Channel 2: -16.8 dB wideband return loss on each of 4 pairs
Channel 3: -32.5 dB crosstalk Pair 1-2, -23.4 dB crosstalk Pair 3-4
Channel 4: IEEE 802.3 MDI return loss limit lines referenced to 100 (see Section 1.3.8)
on each of 4 pairs
In-Line DC Unbalance Generator Unit
Channel 1: Forward DC Unbalance Bias on Alt-A and Alt-B Pair Sets
Channel 2: Forward DC Unbalance Bias on Alt-A and Alt-B Pair Sets
The PVA-PL4 would typically be used for controlling signal/noise ratio incoming to a PVA test port or a device-under-
test. With small patch cables, any fixed, wideband 100 padding between 1 dB and 15 dB in 1 dB steps can be
applied.
The PVA-LI4 will help verify Bulk Return Loss and Bulk Crosstalk measurements. Return losses are synthesized
from both low and high impedance mismatches. The IEEE 802.3 MDI return loss limit line impairment synthesizes
two return loss profiles that reflect how a compliant 802.3 MDI interface should look to a fixed 100 measuring
reference.
Finally, the PVA-DCU was designed to work with the PSE DC Unbalance Test application (see Section 5.6) included
with the PHY Performance Test Suite. This 2-channel device forces a fixed unbalance current of ≈18mA on the PSE
magnetics while powered for PoE. It then allows a PSA-3000 (or PSL-3000) PoE test blade (or PSA-3002 Compact
PSA) to modulate DC unbalance current between 20mA and 80mA as seen by the PSE.
To Next Page
Loading...
Need help?
General
