evdo 3g上网

jylhy

我有一块evdo 3g模块，用ppp拨号，第一次ppp-on成功，能上网，但ppp-off后，再进行拨号ppp-on,打印如下
send (AT^M)
expect (OK)
然后就出现乱码，最后失败，如下
# ./ppp-on
# timeout set to 15 seconds
abort on (NO CARRIER)
abort on (ERROR)
abort on (NO DIALTONE)
abort on (BUSY)
abort on (NO ANSWER)
send (AT^M)
expect (OK)
~^?}#@!}!}!} }=}!}$}%(}"}&} } } } }#}%B#}%}%}&'}="G}'}"}(}"mN~~^?}#@!}!}"} }=}!}$}
%(}"}&} } } } }#}%B#}%}%}&'}="G}'}"}(}"^}4~~^?}#@!}!}#} }=}!}$}%(}"}&} } } } }#}%
B#}%}%}&'}="G}'}"}(}"@Z~~^?}#@!}!}$} }=}!}$}%(}"}&} } } } }#}%B#}%}%}&'}="G}'}"}(
alarm
Failed
Connect script failed


我的配置

chat-connect内容如下：

ABORT "BUSY"
ABORT "NO CARRIER"
ABORT "NO DIALTONE"
ABORT "ERROR"  
ABORT "NO ANSWER"
TIMEOUT 15
"" AT
OK \rATZ
OK-AT-OK ATD#777
CONNECT \d\c


chat-disconnect内容如下：

ABORT "ERROR"
ABORT "NO DIALTONE"
SAY "\NSending break to the modem\n"
""\k"
""+++ATH"  
SAY "\nGood bay\n"

各位大侠帮忙看看会是什么问题造成的，不胜感激