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Description on battery of SCC board of OSN device

Publication Date:  2012-07-24 Views:  38 Downloads:  0
Issue Description
 
In the GSCC deployment guide of OSN7500, the battery jumper J5 is described as follows:
The jumper is connected to pin 2-3: The battery is enabled. When the SCC board power supply fails, the battery can provide power supply to the database and the real-time clock to prevent loss of data and time. It is network operation setting.
The jumper is connected to pin 2-3: The database and the real-time clock discharge electricity and are cleared to zero. This jumper is used at the time of discharging. 
Note: Pin assignment of J5 jumper:
Pin 1 is ground pin; pin 2 is a pin which supplies power to real-time clock and storage chip; and pin 3 is the positive pole of the battery.
If the jumper cap is connected to pin 23, the battery is enabled (namely, the battery supplies power to the real-time clock and SDRAM). This prevents loss of important data after the board on the existing network is removed.
If the jumper cap is connected to pin 12, the battery is disabled. Once powered on, the board will supply power to the real-time clock and the SDRAM component automatically. However, after the board is removed or loses power supply, the data in such component will be lost.        
Alarm Information
 
If the battery is exhausted or the jumper is connected incorrectly (e.g., the jumper is connected to pin 12), the POWER_FAIL alarm will be reported, and the parameter is 05.
For example:
57360 24POWER_FAILMJstart 2007-08-16 13:37:59None 
0x05 0xff 0xff 0xff 0xff 
67365 25POWER_FAILMJstart 2007-08-16 13:57:56None
 0x05 0xff 0xff 0xff 0xff        
Handling Process
 
First, check whether the jumper is correct. If the jumper is connected to pin 2 or 3 during the deployment and the “powerfail” alarm occurs, it indicates the battery runs out, and the board needs to be replaced.
If the component is stored in the warehouse for a long time, it is recommended that the J5 jumper should be connected to pin 1 or 2.        
Root Cause
 
1. What are functions of the battery?
Answer: When the board loses power supply, the battery will supply power to the NVRAM and the clock to prevent data loss. Namely, after the device loses power supply, the data in the drdb can be saved.
2. What is the normal life of the SCC board battery? Is the battery consumed during normal power-on of the board?
Answer: After the board is powered on, the battery will be cut off automatically. The battery will work only if the power supply of the board fails. The continuous working life of the battery is one year as a minimum.
3. The spare parts of the SCC board are stored in the warehouse, and the battery is used as power supply for the NVRAM. How long will the battery work before failure?
Answer: The continuous working life of the battery is one year as a minimum.
4. While the battery jumper exists on the SCC board, can we cut off the supply of the battery? For the SCC board stored in the warehouse, should we cut off the supply of the battery?
Answer: While the battery jumper exists on the SCC board, we can cut off the supply of the battery. If the spare parts are stored in the warehouse for a long time, it is recommended that the jumper should be connected to pin 12 in order to cut off the battery supply.
5. What are strategies for replacing a failed battery?
Answer: If the battery fails, after the board loses power supply, the data in the NVRAM (drdb) will be lost, and the real-time clock will return to the initial value.
In the process of powering on the board, the normal service will not be affected, and the software will report the undervoltage battery alarm. The failed battery should be replaced by a new one in time, and should be disposed of properly.
If any battery failure is discovered during the deployment or on the maintenance site, please replace the board.
6. If the jumper is connected to pin 2 or 3, the battery will not supply power to the board. Generally, this setting should apply if the component is stored in warehouse.
7. The setting of the jumper cap will not make the SCC board of the newly deployed OSN device report the “powerfail” alarm.
8. The normal battery life is approx. 10 years. After expiry of the battery life, the board has to be replaced.       
Suggestions
None      

END