The below table lists other parameters
Parameters Description
Errored Block (EB)
A block having one or more errors. This
is determined by the comparing the
outcome of the BIP check done before and
after transmission. (see note below this
table)
SES declaration threshold
This is the maximum of ES, beyond which
it is declared a SES. This is an
ITU-standard and is defaulted as the
maximum number of admissible EB over
one second. For all network elements, EB
defaults to 30% of the maximum number
of blocks.
Unavailable Period (UAP)
Interval of at least 10 seconds where the
error rate is above the SES threshold. The
UAP starts at the first second of a 10
seconds (or more) stretch SES. It stops at
the first second of a 10 seconds (or more)
duration in which there is no longer any
SES occurring.
Important! The number of blocks per second depends on the signal itself. A VC-12
has 2000 blocks/s while an STM-N does have 8000 blocks/s. The SES threshold
(30%) is calculated from these figures.
SDH parameters thresholds
Thresholds can be described as maximum acceptable number of errors, as provisioned
by the user and in accordance with maintenance philosophy. The values allocated for
those various thresholds are kept on the ITM CIT.
The thresholding functionality is applicable for unidirectional monitoring only. A
prerequisite for the system to apply those thresholds and alert maintenance personal
that they have been crossed, is to enable the thresholding functionality. Once the
thresholding functionality is enabled, the specific values for the thresholds can be input
on the ITM CIT. If no specific values are entered, the system reverts to using default
values.
The ITM CIT defaults to disabled and can be turned on or off. The thresholding
method is an explicit reset method, that is the threshold values must be input in the
system.
Performance monitoring
Available PM data
....................................................................................................................................................................................................................................
365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
10-29
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