Re: 3G Signal CSQ
That's 1/2 a lie, they support RSSI, which is the value they return from AT+CSQ. RSSI is an arbitrary unit that's assumed to be linear in scale (unlike dBm). CSQ is defined to be 0 - 31, and internally in NM that's normalized to a 0...100 scale. Technically GetSignalQuality*does* return RSSI, but may not be reported in the modem's native RSSI scale. On some devices (Ericsson MBM) the scale is 0...5 even. If you're looking for a much deeper RSSI, like radio diagnostic data, then that's actually impossible to get for most devices Very thanks for your help. Aleksander already said me (in spanish). But with my modem seems to be a bug with "echo", solved in next versions of NM (fedora 16 still have old version). Specifically, the logs show that even if we try to disable the echo, the modem doesn't do it, so the replies to AT+CSQ and every other command come with the echo: modem-manager[2430]: [1332115236.128042] [mm-at-serial-port.c:298] debug_log(): (ttyACM1): --> 'AT+CSQ' modem-manager[2430]: [1332115236.134616] [mm-at-serial-port.c:298] debug_log(): (ttyACM1):<-- 'AT+CSQ' modem-manager[2430]: [1332115236.136292] [mm-at-serial-port.c:298] debug_log(): (ttyACM1):<-- '+CSQ: 24,0OK' Newer MM 0.5.2 comes with the built-in echo removal thingy, which should help to fix this issue. -- Aleksander ___ networkmanager-list mailing list networkmanager-list@gnome.org http://mail.gnome.org/mailman/listinfo/networkmanager-list
Re: 3G Signal CSQ
El 22/03/12 17:31, Dan Williams escribió: That's 1/2 a lie, they support RSSI, which is the value they return from AT+CSQ. RSSI is an arbitrary unit that's assumed to be linear in scale (unlike dBm). CSQ is defined to be 0 - 31, and internally in NM that's normalized to a 0...100 scale. Technically GetSignalQuality*does* return RSSI, but may not be reported in the modem's native RSSI scale. On some devices (Ericsson MBM) the scale is 0...5 even. If you're looking for a much deeper RSSI, like radio diagnostic data, then that's actually impossible to get for most devices Very thanks for your help. Aleksander already said me (in spanish). But with my modem seems to be a bug with "echo", solved in next versions of NM (fedora 16 still have old version). But, like a driver,..., I only need the speed, not, how speed it is calculated. I think that I can use RSSI (0-31) with: -113 - (RSSI x 2) dBm. Regards, ___ networkmanager-list mailing list networkmanager-list@gnome.org http://mail.gnome.org/mailman/listinfo/networkmanager-list
Re: 3G Signal CSQ
On Thu, 2012-03-22 at 11:14 -0500, Dan Williams wrote: > On Sun, 2012-03-18 at 16:51 +0100, Aleksander Morgado wrote: > > Hoola, > > > > > I see that NM request signal quality from 3G modem. I need dbm or > > > similar. Any command line option while modem it is locked by NM. > > > I need obtain dbm or result of at+csq > > > > > > > You can query the signal quality retrieved by NM/MM directly using the > > DBus interface and the 'dbus-send' command line utility (assuming your > > modem is at index 0 here): > > > > dbus-send --system --dest=org.freedesktop.ModemManager --print-reply > > /org/freedesktop/ModemManager/Modems/0 > > org.freedesktop.ModemManager.Modem.Gsm.Network.GetSignalQuality > > > > That won't give you neither the raw dBm value nor the rssi, though. It > > will give you a computed percentage value [0,100] representing the > > signal quality. > > Right; most modems don't support reporting dBm or RSSI, including almost That's 1/2 a lie, they support RSSI, which is the value they return from AT+CSQ. RSSI is an arbitrary unit that's assumed to be linear in scale (unlike dBm). CSQ is defined to be 0 - 31, and internally in NM that's normalized to a 0...100 scale. Technically GetSignalQuality *does* return RSSI, but may not be reported in the modem's native RSSI scale. On some devices (Ericsson MBM) the scale is 0...5 even. If you're looking for a much deeper RSSI, like radio diagnostic data, then that's actually impossible to get for most devices. Dan > all that only support AT commands. Proprietary interfaces like CnS, > QMI, WMC, or DIAG etc may support reporting dBm though. However, > remember that dBm is really only useful for 2G and 4G technologies. For > 3G, whether EVDO or UMTS, the unit you're really looking for is EC/IO > (energy-per-chip over interference) which is how signal quality is > calculated for [W]CDMA-based air interfaces. > > Dan > > ___ > networkmanager-list mailing list > networkmanager-list@gnome.org > http://mail.gnome.org/mailman/listinfo/networkmanager-list ___ networkmanager-list mailing list networkmanager-list@gnome.org http://mail.gnome.org/mailman/listinfo/networkmanager-list
Re: 3G Signal CSQ
On Sun, 2012-03-18 at 16:51 +0100, Aleksander Morgado wrote: > Hoola, > > > I see that NM request signal quality from 3G modem. I need dbm or > > similar. Any command line option while modem it is locked by NM. > > I need obtain dbm or result of at+csq > > > > You can query the signal quality retrieved by NM/MM directly using the > DBus interface and the 'dbus-send' command line utility (assuming your > modem is at index 0 here): > > dbus-send --system --dest=org.freedesktop.ModemManager --print-reply > /org/freedesktop/ModemManager/Modems/0 > org.freedesktop.ModemManager.Modem.Gsm.Network.GetSignalQuality > > That won't give you neither the raw dBm value nor the rssi, though. It > will give you a computed percentage value [0,100] representing the > signal quality. Right; most modems don't support reporting dBm or RSSI, including almost all that only support AT commands. Proprietary interfaces like CnS, QMI, WMC, or DIAG etc may support reporting dBm though. However, remember that dBm is really only useful for 2G and 4G technologies. For 3G, whether EVDO or UMTS, the unit you're really looking for is EC/IO (energy-per-chip over interference) which is how signal quality is calculated for [W]CDMA-based air interfaces. Dan ___ networkmanager-list mailing list networkmanager-list@gnome.org http://mail.gnome.org/mailman/listinfo/networkmanager-list
Re: 3G Signal CSQ
Hoola, I see that NM request signal quality from 3G modem. I need dbm or similar. Any command line option while modem it is locked by NM. I need obtain dbm or result of at+csq You can query the signal quality retrieved by NM/MM directly using the DBus interface and the 'dbus-send' command line utility (assuming your modem is at index 0 here): dbus-send --system --dest=org.freedesktop.ModemManager --print-reply /org/freedesktop/ModemManager/Modems/0 org.freedesktop.ModemManager.Modem.Gsm.Network.GetSignalQuality That won't give you neither the raw dBm value nor the rssi, though. It will give you a computed percentage value [0,100] representing the signal quality. Cheers, -- Aleksander ___ networkmanager-list mailing list networkmanager-list@gnome.org http://mail.gnome.org/mailman/listinfo/networkmanager-list
