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The alarm indicators on the EFI of a slave subrack are off because no alarm cascade cable connects the slave subrack and another subrack

Publication Date:  2012-07-25 Views:  40 Downloads:  0
Issue Description
 A new OptiX OSN 6800 NE consists of one master subrack and three slave subracks. The four subracks are housed in two cabinets. The master subrack and slave subrack 1 share one cabinet. Slave subrack 2 and slave subrack 3 share the other cabinet. During commissioning, the four indicators at the top of the cabinet that houses slave subrack 2 and slave subrack 3 are off. In addition, on slave subrack 2 and slave subrack 3, the alarm indicators on the EFI are off. The boards on the two subracks, however, report many alarms. The four indicators at the top of the cabinet that houses the master subrack and slave subrack 1 are on. In addition, on the master subrack and slave subrack 1, the alarm indicators on the EFI are on. 
Alarm Information
Null
Handling Process
 1. On the cabinet housing the master subrack, check the cabinet indicator cables and inter-subrack indicator/alarm cascade cables. The LAMP2 interface on the master subrack is connected to the cabinet indicators. The LAMP1 interface on the master subrack is connected to the LAMP2 interface on slave subrack 0.
2. On the cabinet housing slave subrack 2 and slave subrack 3, check the cabinet indicator cables and inter-subrack indicator/alarm cascade cables. The LAMP1 interface on slave subrack 2 is connected to the LAMP2 interface on slave subrack 3.
3. Therefore, the problem is that no cascade cable connects the LAMP1 interface on slave subrack 1 and the LAMP2 interface on slave subrack 2. Use a crossover cable to connect the two interfaces. On slave subrack 2 and slave subrack 3, the alarm indicators on the EFI are on. The fault is rectified. 
 
Root Cause

 1. On a cabinet, the alarm driving signals on the LAMP1 or LAMP2 interface of the EFI control the cabinet indicators. Therefore, analyze why the alarm indicators on the EFI are off before you analyze why the cabinet indicators are off.
2. The alarm indicators on the EFI of a slave subrack are under the control of the master subrack. Therefore, the problem may lie in the indicator/alarm concatenation between the master and slave subracks. The subracks with the problem are in one cabinet. Therefore, engineers doubt that there is no indicator/alarm cascade cable between the two cabinets. 
 

Suggestions
 1. The alarm indicators on the EFI of a slave subrack are under the control of the master subrack. Therefore, the alarm indicators on the EFI of each slave subrack are on only when the slave subrack is properly connected to the master subrack through an inter-subrack indicator/alarm cascade cable.
2. Before leaving the factory, a cabinet is equipped with the cabinet indicator cables and inter-subrack indicator/alarm cascade cables. The cables between cabinets must be routed in the field. It is recommended that the related information be emphasized in the Hardware Installation Guide.
3. On a subrack, the LAMP1 and LAMP2 interfaces are different from the ALMO1 and ALMO2 interfaces. The ALMO1 and ALMO2 interfaces serve as alarm output and cascading interfaces. The interfaces normally send the subrack alarms to the monitoring equipment (such as the power distribution cabinet). The LAMP1 and LAMP2 interfaces, however, drive the running indicators on the cabinet housing the subrack and the alarm indicators on the EFI. You can regard the interfaces as indicator cascade interfaces.
4. An ETSI 300-mm OptiX OSN 6800 cabinet contains up to four subracks. Assume that a system arranges four subracks in two cabinets like in this example. Exercise caution when you expand the capacity of the system. When you add a slave subrack to the cabinet to which the master subrack belongs, change the inter-subrack indicator/alarm cascade cables. In other words, incorporate the new slave subrack in the system. 
 

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