Agilent Technologies N4906B Serial BERT User Manual page 122

Setting up the Error Detector
122
Ending too late: If the Gate In signal is deactivated too late, the last
received bits will not be part of the burst. Thus, the BER will increase.
If the BER is higher than the Burst Sync Threshold, the burst will be
considered a bad burst.
End too late
Data Input
Gate Input
Pattern Synchronization – Procedures
To synchronize the incoming pattern to the expected pattern:
1 Press Pattern Sync in the ED Setup menu.
2 Select the synchronization mode (Normal or Burst sync mode).
3 If you selected Normal synchronization mode, choose whether you
want Automatic or Manual synchronization.
4 Specify the Sync Threshold at which the pattern will be recognized
at synchronized.
5 In Manual synchronization mode use the Sync Now button to start
the pattern synchronization. This is recommended whenever you
did changes to the pattern setup, the voltage levels or the hardware
connections (for example, altered cable lengths).
6 Press OK to confirm your settings.
Agilent N4906B Serial BERT, User's Guide, October 2005
CDR Settling Time
Synchronization Time
Burst
Bit Count Time
Pattern Synchronization