Measuring Service Disruption Time - HP 37717C User Manual

Making Measurements

Measuring Service Disruption Time

Measuring Service Disruption Time
Description: Protection switching ensures that data integrity is maintained and
revenue protected when equipment failure occurs. The speed of operation
of the protection switch can be measured.
This measurement is available in instruments with option UKJ,
Structured PDH fitted or at STM-4c if option 130 or 131 is fitted, or if
option 110 DSn SPDH is fitted.
The sequence of events involved in measuring the switching time is:
• Pattern Synchronization (no errors) is achieved.
• The protection switch is invoked - Pattern Synchronization is lost.
• The standby line is in place - Pattern Synchronization is regained.
The time interval between pattern sync loss and pattern sync gain is a
measure of the disruption of service due to protection switching.
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