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el berto
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Posts: 202
Joined: Wed Sep 26, 2007 10:53 am

How correctly init a 3G modem?

Mon Sep 15, 2014 6:24 pm

Hi, I need to make a script about 2G/3G switchig.


Here AT commands to set 2G/3G mode (for HUAWEI USB modem):
Auto : AT^SYSCFG=2,0,3FFFFFFF,2,4
2G only : AT^SYSCFG=13,1,3FFFFFFF,2,4
3G only : AT^SYSCFG=14,2,3FFFFFFF,2,4
2G preferred : AT^SYSCFG=2,1,3FFFFFFF,2,4
3G preferred : AT^SYSCFG=2,2,3FFFFFFF,2,4

First I set modem-init string to:
AT^SYSCFG=2,1,3FFFFFFF,2,4
and modem not working.
Then I started to enable modem (with init string) and reboot after few seconds.
Nothing to do.

Only working sequence is:
- disable ppp client
- set manually init string through serial-terminal
- shutdown RB750U
- unplug power
- restart system
- enable ppp-client

So, what's the trouble?
15:17:53 async,ppp,info 3G: initializing... 
15:17:53 async,ppp,info 3G: reseting link... 
15:17:54 async,debug usb1:0: sent ATH 
15:17:54 async,debug usb1:0: rcvd OK 
15:17:54 async,ppp,info 3G: initializing modem... 
15:17:55 async,ppp,info 3G: dialing out... 
15:17:55 async,debug usb1:0: sent AT+CGDCONT=1,"IP","ibox.tim.it" 
15:17:55 async,debug usb1:0: rcvd OK 
15:17:55 async,debug usb1:0: sent ATDT*99***1# 
15:17:55 async,debug usb1:0: rcvd NO CARRIER 
15:17:55 async,debug usb1:0: no carrier, redialing 
15:17:55 async,debug usb1:0: sent ATDT*99***1# 
15:17:55 async,debug usb1:0: modem hung up 
15:17:55 async,ppp,info 3G: terminating... - modem hunged up 
15:17:55 async,ppp,debug 3G: LCP lowerdown 
15:17:55 async,ppp,debug 3G: LCP down event in initial state 
15:17:55 async,ppp,info 3G: disconnected 
15:17:55 async,ppp,info 3G: initializing... 
15:17:55 async,ppp,info 3G: reseting link... 
15:17:56 async,debug usb1:0: sent ATH 
15:17:56 async,debug usb1:0: rcvd OK 
15:17:56 async,ppp,info 3G: initializing modem... 
15:17:57 async,ppp,info 3G: dialing out... 
15:17:57 async,debug usb1:0: sent AT+CGDCONT=1,"IP","ibox.tim.it" 
15:17:57 async,debug usb1:0: rcvd OK 
15:17:57 async,debug usb1:0: sent ATDT*99***1# 
15:17:57 async,debug usb1:0: rcvd NO CARRIER 
15:17:57 async,debug usb1:0: no carrier, redialing 
15:17:57 async,debug usb1:0: sent ATDT*99***1# 
15:17:57 async,debug usb1:0: modem hung up 
15:17:57 async,ppp,info 3G: terminating... - modem hunged up 
15:17:57 async,ppp,debug 3G: LCP lowerdown 
15:17:57 async,ppp,debug 3G: LCP down event in initial state 
15:17:57 async,ppp,info 3G: disconnected 
15:17:58 async,ppp,info 3G: initializing... 
15:17:58 async,ppp,info 3G: reseting link... 
15:17:59 async,debug usb1:0: sent ATH 
15:17:59 async,debug usb1:0: rcvd OK 
15:17:59 async,ppp,info 3G: initializing modem... 
15:18:00 async,ppp,info 3G: dialing out... 
15:18:00 async,debug usb1:0: sent AT+CGDCONT=1,"IP","ibox.tim.it" 
15:18:00 async,debug usb1:0: rcvd OK 
15:18:00 async,debug usb1:0: sent ATDT*99***1# 
15:18:00 async,debug usb1:0: rcvd NO CARRIER 
15:18:00 async,debug usb1:0: no carrier, redialing 
15:18:00 async,debug usb1:0: sent ATDT*99***1# 
15:18:00 async,debug usb1:0: modem hung up 
15:18:00 async,ppp,info 3G: terminating... - modem hunged up 
15:18:00 async,ppp,debug 3G: LCP lowerdown 
15:18:00 async,ppp,debug 3G: LCP down event in initial state 
15:18:00 async,ppp,info 3G: disconnected 
15:18:01 async,ppp,info 3G: initializing... 
15:18:01 async,ppp,info 3G: reseting link... 
15:18:02 async,debug usb1:0: sent ATH 
15:18:02 async,debug usb1:0: rcvd OK 
15:18:02 async,ppp,info 3G: initializing modem... 
15:18:03 async,ppp,info 3G: dialing out... 
15:18:03 async,debug usb1:0: sent AT+CGDCONT=1,"IP","ibox.tim.it" 
15:18:03 async,debug usb1:0: rcvd OK 
15:18:03 async,debug usb1:0: sent ATDT*99***1# 
15:18:03 async,debug usb1:0: rcvd NO CARRIER 
15:18:03 async,debug usb1:0: no carrier, redialing 
15:18:03 async,debug usb1:0: sent ATDT*99***1# 
15:18:03 async,debug usb1:0: modem hung up 
15:18:03 async,ppp,info 3G: terminating... - modem hunged up 
15:18:03 async,ppp,debug 3G: LCP lowerdown 
15:18:03 async,ppp,debug 3G: LCP down event in initial state 
15:18:03 async,ppp,info 3G: disconnected

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