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FAQ-Functions and Replacement Method of the SCC in a Slave Subrack

Publication Date:  2012-07-25 Views:  38 Downloads:  0
Issue Description
Q:
What are the functions of the SCC in a slave subrack on the OptiX OSN 6800? What should be noted when the SCC is replaced? 
 
Alarm Information
Null
Handling Process
A:
When the SCC in a slave subrack is faulty, the following cases may occur:
1. The AUX board of the slave subrack works normally and does not report an alarm. After hard reset is performed on the AUX board, it reports the BD_STATUS alarm.
2. All service boards of the slave subrack report the COMMUN_FAIL alarm. Each board reports twice with the parameters of 0x00 and 0x01 and 0x00 and 0x02.
3. All boards that do not have the software, in the slave subrack report the BD_STATUS alarm.
4. When the SCC is faulty, all boards report the BD_STATUS alarm if the AUX board is reset. 
 
Root Cause
The functions of the SCC in a slave subrack are as follows:
1. 1. Communicating with boards that do not have the software to control the working states of these boards
2. Receiving overhead signals from service boards through the 485A or 485B bus and processing these overhead signals
3. Processing the overhead signals transmitted from the master subrack and then transmitting the processed overhead signals to service boards
4. Checking whether the boards in a slave subrack are in position and reporting the check result to the SCC in the main subrack
5. Providing two RS485 buses for transmitting urgent data
6. Providing working power for the SCC, providing 3.3 V centralized power backup for the entire OptiX OSN 6800, and providing power backup for a board whose maximum power consumption is lower than 60 W (providing power backup for only one board at the same time) 
 
Suggestions
Pay attention to the following points when the SCC in a slave subrack is replaced:
1. The data transmission operation is not related.
2. Short the jumpers of the battery, that is, pin 2 and pin 3 are connected.
3. If the SCC in the slave subrack is not configured with 1+1 protection, the ESC and OSC communication modes are invalid. 
 

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