In the following figure, three different regions are noticeable. The grey shaded indicate
the BBE.
The SES Declaration Threshold is set to 30%, which result in 600 errored blocks, as
the maximum tolerable level of BBE for that type of signal. Since a VC–4 signal has
8000 frames per second and a VC-12 has 2000 frames per second, the 30% threshold
for a VC-12 signal is lower than for a VC-4 and corresponds to 30%X2000 or 600
BBE.
In the following figure, three different regions are noticeable.
• REGION I: In the first (I) region the SES Declaration Threshold is not reached and
therefore only ESs are detected. Since there is no SES in this region, there is no
AUS either.
• REGION II: In the second (II) region the SES Declaration Threshold is exceeded
and several SESs are detected. An SES is also counted as an ES so the total period
is also counted as ES. The SES is declared at the beginning of the stretch where
the threshold is passed for longer than 10 seconds in a row.
• In the third (III) region the amount of SES lasts for more than ten consecutive
seconds, so UAS is detected. However an UAS is not detected as ES or SES.
Measurement periods
Measurement Parameters data is accumulated over a period of time which is referred to
as the measurement period. There are two possible measurement periods:
• 15 minutes
• 24 hours
Performance monitoring
Available PM data
....................................................................................................................................................................................................................................
365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
10-33
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