Specifications

4-24
Operating Features and Specifications
Pattern Synchronization
NOTE The Synchronization threshold does not affect the error pattern
synchronization attempt but will affect the instrument's “SyncLs”
status.
While Burst Gating is selected the only available Gating repeat mode
is manual untimed.
If the received data is errored during the synchronization attempt all
measured error counts are invalid.
The received clock must be continuous when burst gating is enabled.
Pattern Synchronization
Synchronization Modes
Synchronization to the incoming pattern can be performed automatically or manually. In
manual mode, the START SYNC softkey forces the error detector to attempt
synchronization with the received pattern.
Sync Gain Loss Criteria
The criteria for gaining or losing synchronization is the error ratio in a 1 ms interval.
Selectable error-ratio thresholds of 1E−1to1E−8 are provided. Refer to Appendix B
Operating Notes for advice on setting sync thresholds.
Synchronization Times
• PRBS patterns - <0.2s
• STM64 frame at 10 GHz - <2.8s
• <10 kbit pattern, >1 GHz - <1s
Audible Output
The instrument has an audible output which varies with error rate. The effect of changing
error rate is:
• Isolated errors - output produces a 100 ms tone.
• Other error rates - 5% change in error rate produces an audible change.