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AM3352 Using 3G Module

Other Parts Discussed in Thread: AM3352

Hi:

I'm using AM3352 with 3G module,it can dial to connect the network,and it can ping www.ti.com.cn,jus list this:

[root@my3352 peers]# ping www.ti.com.cn
PING www.ti.com.cn (182.118.82.199): 56 data bytes
64 bytes from 182.118.82.199: seq=0 ttl=54 time=288.092 ms
64 bytes from 182.118.82.199: seq=1 ttl=54 time=296.467 ms
64 bytes from 182.118.82.199: seq=2 ttl=54 time=285.501 ms
64 bytes from 182.118.82.199: seq=3 ttl=54 time=294.563 ms
64 bytes from 182.118.82.199: seq=4 ttl=54 time=264.032 ms
64 bytes from 182.118.82.199: seq=5 ttl=54 time=272.843 ms

But ,when it ping www.ti.com.cn, I enter CTRL +C in the keyboard to stop the ping program,my 

3G connection terminated,and the ppp0 device dismissed.

64 bytes from 182.118.82.199: seq=1 ttl=54 time=296.467 ms
64 bytes from 182.118.82.199: seq=2 ttl=54 time=285.501 ms
64 bytes from 182.118.82.199: seq=3 ttl=54 time=294.563 ms
64 bytes from 182.118.82.199: seq=4 ttl=54 time=264.032 ms
64 bytes from 182.118.82.199: seq=5 ttl=54 time=272.843 ms
Terminating on signal 2
Connect time 0.6 minutes.
Sent 563 bytes, received 720 bytes.
sent [LCP TermReq id=0x2 "User request"]

--- www.ti.com.cn ping statistics ---
6 packets transmitted, 6 packets received, 0% packet loss
round-trip min/avg/max = 264.032/283.583/296.467 ms

rcvd [LCP TermAck id=0x2]
Connection terminated.

Is it something wrong with my dial script? Please give me some advise,Thank you very much.