IPS will disconnect all 1xEV-DO device that is online continue 3 hours, reconnect by win7's dial-up internet. The disconnect/reconnect takes about 5s.

Could you explain the detail of vardiff?

I set diff at 1024 in machine software, but mining_proxy also shows diff 1880. Mining in btcguild, mining_proxy will show 1024, of couse, I set pool worker diff at 1024. So, xia-class can mine fully in btcguild. But I still like slush pool more.