Testing Process
The test set measures how long the event remains present after it is first recognized and will continue to measure the total
service disruption time in the event of multiple disruptions.
Before starting, ensure that no errors or alarms are present on the transmission system because this will impact the
measurement.
In the past, Automatic Protection Switching (APS) was used to measure physical service cuts, especially in optical links.
Service disruption measurements are meant to measure the total time the service is not available to customers, which is
not limited by the optical path cut. Therefore, it configures to include the time the whole system takes to recover.
Service Disruption can still be used to measure APS time, if the trigger selected is LOS only. This will just measure the
physical protection switch time.
Setup
1. Set
Enable
to ON to activate SDT testing.
2. Set a limit time and gate time. Limit and Gate Time counters begin at the onset of the first valid event.
Limit Time:
Specifies pass/fail criteria for SDT events. This represents the acceptable amount of time for the
customer to experience a service disruption. Events greater than the limit time are considered a fail. Configurable
from 20 to 1000 ms.
Gate Time:
Specifies the length of error free signal time used to determine the end of service disruptions.
Configurable from 20 to 10000 ms. The Gate Time is not included in the service disruption time calculation.
3. Select the type of errors/alarms from the
SONET
,
PDH
,
BERT
,
OTN
tabs that will trigger the SDT test.
4. Press the
Start
button to begin testing.
SDT SONET
Multiple Service Disruptions
RXT-3900 e-Manual D07-00-111P Rev A00
Содержание RXT3900
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