Difference between revisions of "GSM"

From Tmplab
(AT commands)
(FAQ)
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* You may ask what happend if your have no available network around you (or if you're jammed ?)  
 
* You may ask what happend if your have no available network around you (or if you're jammed ?)  
Probably CSQ = O and RSSI
+
MODE Command will probably display no service 0 and no submode 0 : ^MODE:0,0
 +
A service state change indication can also be displayed : ^SRVST:0
  
 
* Are all networks around me legit ?
 
* Are all networks around me legit ?
 
You may look at your GPS position, lookup for known networks at opencellid.org and compare.
 
You may look at your GPS position, lookup for known networks at opencellid.org and compare.

Revision as of 22:36, 16 May 2015

Work in Progress

This page is meant to understand how GSM network works by experiencing it. This wiki uses an USB 3G modem. Yet another help.

Setup

  • Use a Huawei 1750
  • Serial port connection. It should bring 3 things in /dev, like ttyUSB0, ttyUSB1 and ttyUSB2 in Linux. Use it 8n1 9600 bauds, DTR/RTS ON on startup
  • Terminal software

Linux : use picocom : picocom --echo /dev/ttyUSB2

OS X: i.e coolterm. Use tty.HUAWEIMobile-Pcui among the 3 serial ports tty.HUAWEIMobile-Diag, tty.HUAWEIMobile-Modem, tty.HUAWEIMobile-Pcui

AT commands

  • To enter a pin code (i.e 0000). If a pin authentication is required if needed to use other commands like network interactions.

AT+CPIN=0000


  • AT+COPS? display the connected network, name and some infos

+COPS: 0,0,"F SFR",2


  • AT+COPS=? Displays all available networks

+COPS: (3,"F-Bouygues Telec","BYTEL","20820",2),(3,"Orange F","Orange","20801",2),(2,"F SFR","SFR","20810",2),(3,"","","20815",2),,(0,1,2,3,4),(0,1,2)


  • AT+CREG displays other informations on the connected network.

AT+CREG=2 Asks for advanced informations

+CREG: 5, 460055, 8BF06F

4655 = 18005 = Location area number

8BF06F = 7516441 = network cell ID


  • AT+CSQ Displays the radio quality

+CSQ: 10,99

FAQ

  • You may ask what happend if your have no available network around you (or if you're jammed ?)

MODE Command will probably display no service 0 and no submode 0 : ^MODE:0,0 A service state change indication can also be displayed : ^SRVST:0

  • Are all networks around me legit ?

You may look at your GPS position, lookup for known networks at opencellid.org and compare.