USB interface is getting created and also ppp is established . After sending few packets perfectly the packets are getting dropped.thats why ppp interface is down and never getup. This scenario is ocurring everytime.
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I got reason behind it. Actually Due to USB HUB device ,it was difficult to read the data on read register of Host controller.USB HUB was having long wire.So i just used short wired HUB.

Md Muazzam
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