Viavi Xgig User Manual page 84

Chapter 3, Getting Started with Xgig TraceControl
Tuning, you should attempt Equalization at the higher and lower settings from the current
setting. Re-tune whenever you change Equalization settings.
Table 4: Recommended Equalization Settings
Case / Equalization Settings
1.5000 Gbps Operation
3.0000 Gbps Operation
6.0000 Gbps Operation, Short
Cables,
No De-Emphasis
6.0000 Gbps Operation, Long
Cables,
No De-Emphasis
6.0000 Gbps Operation, Short
Cables,
Low De-Emphasis
6.0000 Gbps Operation, Long
Cables,
Low De-Emphasis
6.0000 Gbps Operation, Short
Cables, High De-Emphasis
6.0000 Gbps Operation, Long
Cables,
High De-Emphasis
Low De-Emphasis < 3dB
Medium De-Emphasis = 3dB
High De-Emphasis > 3dB
70
None Low Medium







Xgig Tuning and Equalization
High
Frequency components not high enough to
need equalization in normal use.
Frequency components not high enough to
need equalization in normal use.
Frequency components close to the source
may need medium equalization as the
channel will attenuate high frequencies.

Frequency components far from the source
may need high equalization as the channel will
significantly attenuate high frequencies.
Frequency components close to the source
may need low equalization as low
de-emphasis and cable may cause the
channel to mildly attenuate high frequencies.
Frequency components far from the source
may need medium equalization as the low
de-emphasis and long cable may cause the
channel to moderately attenuate high
frequencies.
Frequency components close to the source
may not need equalization as high
de-emphasis and short cable may normalize
the signal.
Frequency components far from the source
may need low equalization as high
de-emphasis and long cable may cause the
channel to mildly attenuate high frequencies.
Short cable = 0.5m to less than 2.0m
Long cable = 2.0m to 3.0m
Notes
Xgig Analyzer User's Guide