Anritsu BERTWave Series, Operation Manual, Page: 414 / 466

Appendix A Specifications
A-18
Table A.3.4-2 Amplitude/Time Measurement (Cont’d)
Item Specifications
PAM4 Measure Setup
(Cont’d)
Eye Opening
Definition
“Zero Hits”: The value at which the Eye opening becomes the largest in
the sample evaluation is measured.
“1E–01 to 1E–06”:
Error rate is set in step of 1E+01, The measurement result
is calculated at the specified error rate.
Linearity Definition Sets the definition of the Linearity measurement method.
IEEE Clause 94
IEEE Annex 120D
Target SER Sets the SER (Symbol Error Rate) to be used when measuring TDECQ.
Range: 9.99E–06 to 1.00E–01
* This can be set from the IEEE or FC standard.
Optimize Threshold Sets whether to optimize the threshold for measuring TDECQ as specified in
the IEEE 802.3cd.
TDECQ Reference
Equalizer
In the optical channel, whether to process a reference equalizer for TDECQ
measurement is settable.*
12
Display Equalized
Waveform
“ON”: Displays the waveform after Reference Equalizer process.
“OFF”: Displays the waveform before the Reference Equalizer process.
Equalizer Type
Set the equalizer type to automatically calculate the Tap for Reference
Equalizer.
“TDECQ”: Calculates the Tap coefficient that optimizes TDECQ.
“Linear”: Calculates the Tap coefficient that increases the eye
opening.
Equalizer Tap “Calculate”: Executes the calculation for Tap optimization.
After the calculation, whether the calculation was
completed normally is indicated in the item of Status.
“Tap Count”: The number of Taps for the Reference Equalizer.
It can be set in the range of 3 to 13.
“Taps”: The number of Taps for the Reference Equalizer. The
number is setteble up to 6 decimal places.
“Status”: The flag which indicates whether to the last calculation
was completed successfully.
Optimization Selects an algorithm to optimize taps.
“Fast”: Low optimization level but faster calculation
“Auto”: High optimization level but slower calculation.
Number of
Precursors
This function is available when the Optimization is set to “Fast”.
Range: 0 to (Tap–1)
*12: Processing is possible when Signal Type of the target channel is PAM
4, Coherent Eye setting and Test Pattern is PRBS2^7-1, PRBS2^9-1,
PRBS2^11-1, PRBS2^13-1, PRBS2^15-1 or SSPRQ.