发送AT指令配置模块参数都正常，联网2分钟就会自动断网，反馈+ZUSLOT: 0,0 ，提示卡状态不识别，网络就会自动断掉。
+ZMSRI
OK
OK
+ZICCID: 898602C00114F0030005
OK
+ZPBIC: 1,0
+ZPBIC: 1,1
+CFUN: 0
OK
OK
+CREG: 2
+CGREG: 2
+ZUSLOT: 0,0
+ZUINIT: 30,1,"898602C00114F0030005",0,"FFFFFFFFFFFFFFFF","FFFFFFFFFFFFFFFF"
OK
+ZUSTAT: 1
+ZURDY: 1,30
+ZPBIC: 1,0
+ZPBIC: 1,1
+CFUN: 1
OK
+CGDCONT: 1,"IP","","0.0.0.0",0,0,0,0
+CGDCONT: 2,"IP","","0.0.0.0",0,0,0,0
OK
+CGEV: ME PDN ACT 1
+CEREG: 1
^MODE: 17,255
+CREG: 0
+CSQ: 127,99
OK
+ZBAND: 3,38
OK
+CGEV: ME PDN ACT 2
+ZGIPDNS: 1,2,"IP","10.44.255.94","0.0.0.0","221.130.33.60","221.130.33.52"
OK
+ZCONSTAT: 1,2
+ZUSLOT: 0,0
+CREG: 2
^MODE: 0
+CGEV: ME PDN DEACT 1
+CGEV: ME PDN DEACT 2
+ZCONSTAT: 0,2
------解决方案--------------------
换一下端口，或者重做网头，最好就是直接连电脑上ping一下看看是不是交换机的问题，一般的是线路问题