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FAQ – Compare the OLP protection switching on the OptiX NG-WDM equipment and the OLP protection switching on the traditional OptiX WDM equipment

Publication Date:  2012-07-25 Views:  59 Downloads:  0
Issue Description
Compare the OLP protection switching on the OptiX NG-WDM equipment and the OLP protection switching on the traditional OptiX WDM equipment. 
Alarm Information
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Handling Process

1. On the traditional OptiX WDM equipment, the OLP receives two optical signals on the two optical interfaces. The OLP detects the optical powers of the two optical signals. If the difference between the optical powers is equal to or greater than 3 dB but less than 5 dB, the OLP reports the optical power difference degrade alarm. If the difference between the optical powers is greater than 5 dB, the OLP reports the optical power difference threshold-crossing alarm. The OLP switches to the optical signal of better quality.
Switching conditions: 
      Optical power difference threshold-crossing alarm .
      LOS on the working or protection channel .
2. On the OptiX NG-WDM equipment, the OLP allows you to set the initial difference between the working and protection channels. In this way, the optical power difference during engineering design can be eliminated. The OLP also allows you to set the threshold of the difference between the working and protection channels. The default difference threshold is 5 dB. In addition, the OLP allows you to set the LOS threshold. The default LOS threshold is �35 dB.
The switching conditions are associated with the working and protection optical powers. At present, there are the following two switching conditions: 
      LOS on the working or protection channel. In the case of such an alarm, the OLP switches the services to the channel without LOS. 
      Optical power difference threshold-crossing alarm. In the case of such an alarm, the OLP switches the services to the channel with higher performance.
The difference here refers to a relative value. For example, assume that the optical power difference threshold is 5 dB. Assume that the initial optical power on the working channel is 1 dBm and that the initial optical power on the protection channel is 2 dBm. Then set the initial difference to �1 dB (= optical power on the working channel � optical power on the protection channel). When the optical power on the working channel becomes �3 dBm, the difference between the working and protection channels becomes 4 dB (= |�3 � 2| � 1). The difference 4 dB is less than the difference threshold 5 dB. Therefore, the OLP performs no switching. If the difference becomes 5 dB or greater, the OLP reports the optical power difference threshold-crossing (POWER_DIFF_OVER) alarm and performs switching.
NOTE
On the OptiX NG-WDM equipment, the OLP reports no alarm when the difference between the two optical powers is equal to or greater than 3 dB but less than 5 dB.
Switching conditions: 
      Optical power difference threshold-crossing (POWER_DIFF_OVER) alarm .
      LOS on the working or protection channel .
NOTE :
The OLP detects only optical power. Therefore, the OLP performs switching based on only the optical power comparison instead of B1OVER and LOF. 
 

Root Cause
Null
Suggestions
 These are protection features. Understanding the features helps you to locate a possible OLP protection fault. 

END