Difference between revisions of "GSM"

From Tmplab
(FAQ)
Line 1: Line 1:
 
Work in Progress
 
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.
+
Yet another help to understand how GSM network works by experiencing it. This wiki uses an USB 3G modem.  
  
 
= Setup =
 
= Setup =
Line 15: Line 15:
 
= AT commands =
 
= AT commands =
  
 +
* Get sure it's working type ATI
 +
 +
Manufacturer: huawei
 +
Model: E1750
 +
Revision: 11.XXXXXXXX
 +
IMEI: XXXXXXXXXXXXXXXXX
 +
+GCAP: +CGSM,+DS,+ES
  
 
* To enter a pin code (i.e 0000). If a pin authentication is required if needed to use other commands like network interactions.
 
* To enter a pin code (i.e 0000). If a pin authentication is required if needed to use other commands like network interactions.

Revision as of 23:10, 16 May 2015

Work in Progress

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

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

  • Get sure it's working type ATI

Manufacturer: huawei Model: E1750 Revision: 11.XXXXXXXX IMEI: XXXXXXXXXXXXXXXXX +GCAP: +CGSM,+DS,+ES

  • 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
COPS may answer 0 : +COPS: 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.


Links