Function and feature of OSN1500 AUX

1. manage interface : provide OAN/F&f interface ,support x.25 protocol. Provide 10M/100M NMS interface .
2 clock interface : provide 2 BITS input interfaces and 2 output interfaces ,resistance 120
3. alarm switch interface : provide 3 alarm input and 1 alamr output interface
4. internal communication: implemetation communication between boards
5. power backup and check : observer 2 seperate -48V power ,also monitor over-voltage (-72v) and low -voltage (-38.4)

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