Table 7-8: Failure Types - Ericsson Marconi OMS 1200 Product Description

Serial
1 Excessive Bit Error Ratio (BER) - bit error ratio >1x10-3 (Enable/Disable) - Default:
Enabled
2 Section Trace Mismatch - You have the option of either enabling or disabling this
criterion - Default: Enabled
3 Signal Degrade - You are able to configure the signal degrade calculation to be
based either on equivalent BER or USE or degraded seconds calculations. You also
have the option of enabling or disabling signal degrade - Defaults: signal degrade
enabled/criteria USE.
Failures of types shown in Table 7-8 cause a Signal Fail (SF) flag or Signal Degrade
(SD) flag as applicable to be inserted into the traffic interface to the core unit.
Disabling the above criteria (2) Table 7-8 also disables the associated alarms. The
enable/disable functions lie within the section/path maintenance configuration
applications of the SMA, not the protection configuration applications.
A failure of type (3) Table 7-8 causes a Signal Degrade (SD) flag to be inserted into
the interface to the core unit. Resetting of a condition causes the resetting of the
appropriate flag.
Enabling/disabling criteria for setting the SD Flag can either be handled within the
protection configuration applications, or within the section/path maintenance
configuration applications of the SMA (events and traffic connection management).
You are able to configure degraded path performance fault reporting on a per-section
basis. The configurations include the following:
•
•
•
•
The defaults are fault reporting enabled for USE alarm reporting.
Which ever attributes are configured for fault reporting, the same are used as the
Enable/Disable configurations for setting the SD signalling flag, and vice-versa.
•
•
•
221 02-ZAP 701 25/1 Rev C 2006-08-04
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Table 7-8: Failure Types

Fault Report Disabled
Fault Report based on equivalent BER calculations - Path Signal Degrade
alarms reported
Fault Report based on Unacceptable Short-Term Error performance
calculations - Path USE alarms reported
Fault Report based on Degraded Error performance calculations - Path
Signal Degrade alarms reported.
The Signal Degrade fault type works on BIP bit equivalent binary error ratio
calculations (for example, ratio 10e-6). The USE fault type works on the
crossing of a threshold of consecutive severely errored seconds. These are
calculated for each multiplex section by the protected pair SDH interface
units.
Degraded path performance can be based on USE or Consecutive
Degraded Seconds (CDEGS). Separate configurable thresholds are
provided for SES (performance monitoring) and DEGS (events handling).
You can configure the signal degrade fault type to work on BIP BERs, or
CDEGS.
Technical Product Description
Failure Types
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