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evdo-wizard
EVDO Heavy User
Joined: 21 Apr 2007
Posts: 125
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 Posted: Sun Sep 02, 2007 11:48 am Post subject: Linux support for Signal strength, etc. |
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Right now in Linux we cant do most of the things that can be done on a Windows machine with a connection manager. I'm trying to get these features available in Linux, not only because I run linux on my PC as my main and only OS, but because Linux is also on my 3G router.
I was browsing the Sierra Wireless website today and I found this:
from: http://www.sierrawireless.com/faq/ShowFAQ.aspx?ID=601
| Quote: | Using AT Commands – CDMA Devices
AT commands should be issued to endpoint 2 (/dev/ttyUSB0) on CDMA devices and cannot be used during a connection (Heatherington escape method is not supported). Usage of the proprietary control and status protocol (CNS) on /dev/ttyUSB1 is not yet supported on Linux.
The RSSI (signal quality) can be obtained issuing the command with any terminal application:
(e.g. Minicom)
at+rssi?
A range from -60 dbm to -90 dBm can be considered adequate.
at!pcinfo
The command reports if the modem is online. In case the modem is in LPM (low power mode)-the Radio part is off. To turn the radio On, issue the AT command
at!pcstate=1
The same command will report the modem “Online”. For AirCards, you will notice the LED in the card will turn on.
Using AT Commands – GSM/UMTS Devices
Systems using the MC8775 and later MiniCards should issue AT commands/queries to endpoint 5 (/dev/ttyUSB2) and can be used while a data connection is established on endpoint 2 (/dev/ttyUSB0). In order to establish the connection the dial command, ATDT, should still be issued to endpoint 2 (/dev/ttyUSB0).
All other devices (all AirCards and preceding MiniCards) should issue AT commands/queries to endpoint 2, /dev/ttyUSB0. However if a ppp connection is established on endpoint 2 then, like the CDMA devices, AT commands can not be used.
Usage of the proprietary control and status protocol (CNS) on /dev/ttyUSB1 is not yet supported on Linux.
The RSSI (signal quality) can be obtained issuing the command with any terminal application:
(e.g. Minicom)
at+csq
The first number indicates the signal strength above -109 dBm (in 2 dBm increments). A value of 7 or higher (-95 dBm) can be considered adequate.
at!gstatus?
It provides you which service does you have in your area. The command reports if the modem is online. In case the modem is in LPM (low power mode)-the Radio part is off. To turn the radio on issue the AT command
at+cfun=1
The same command will report the modem “Online”. For AirCards, you will notice the LED in the card will turn On.
The AT command reference is posted here: |
This is some of the best information that I've been able to find for Linux as of yet. I know that people have been using at+csq but apparently there is also a at+rssi? command which is said to work on evdo cards. Another command that I noticed was at!gstatus? which "provides you which service does you have in your area." This is listed under the gsm/umts cards, but the command might work for our cdma evdo cards.
Also this is very interesting:
| Quote: | All other devices (all AirCards and preceding MiniCards) should issue AT commands/queries to endpoint 2, /dev/ttyUSB0. However if a ppp connection is established on endpoint 2 then, like the CDMA devices, AT commands can not be used.
Usage of the proprietary control and status protocol (CNS) on /dev/ttyUSB1 is not yet supported on Linux. |
I'm hoping that maybe this information can help lead to full 3g card support in linux. |
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plor
EVDO Newbie
Joined: 09 Oct 2007
Posts: 5
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| Posted: Tue Oct 09, 2007 1:56 pm Post subject: |
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| I would be very interested to see support for this come about. Especially being able to find signal strength while connected to the network. Let me know if there is anything I can do to help. |
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