How To Connect Internet with Modem HSDPA Aircard At&T Sierra Wireless (Linux Ubuntu, Version 7,1)

I'm beginner in Linux Ubuntu,
Please help me, I want to connect to Internet with Modem Sierra At&T Hsdpa 875U,
Thank You Before

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This particular model also had a single Ethernet based LAN interface.So most consumers using this as an AP would have had to point the Ethernet..connection towards the Internet. In most cases the LAN interface is a trusted management interface so I believe that would leave it wide open to snmp and telnet attacks from the internet.
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