PVA-3000 Reference Manual
December 2, 2019 Sifos Technologies
4.18.5. Example 5: Measure Wideband Power Loss of Line Loss Impairment given 100BaseTX DUT
Test port 1,1 should be connected to a DUT that supports 100BaseTX operation.
Hint: If all pairs are impaired, then it won’t matter whether DUT links as MDI or MDI-X. Measure loss on either pair.
Conclusion: Wideband loss of the Line Impairment is 7.1 dB.
# Example 5 script
# Using PVA-3102 in slot,port 1,1
set port 1,1
# Add the 100m Line Impairment on all Pairs
pva_line $port impair all
# Configure the Test Port for 100Base-TX, full duplex, and
re-link
pva_speed $port 100 duplex full
# Measure the broadband power with the impairment in place
set impr_dB [lindex [pva_rx_pwr $port stat] 5]
# Remove the 100m Line Impairment on all Pairs
pva_line $port normal all
# Measure the broadband power without the impairment
set dB [lindex [pva_rx_pwr $port stat] 5]
# Calculate the wideband power loss of the Line Impairment
set LOSS [expr $dB - $impr_dB]
Figure 4.10 Exercise 5 Script Execution
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