Is it possible to measure the signal strength?

[ashok_kumar]

Hi friends,

                I had connected the USB modem into Fortigate 40C and configured now its working fine.When am checking the internet speed Its variable output showing.Is it possible to measure the signal strength ? Same like laptop or PC? please advise me

[emnoc]

Are you talking about 3/4G modem? if yes, you can issue a at command similar to  AT+CSQ? or AT+CSQ  ( depending on model )

eg for a typical usb-3g modem

diag sys modem cmd AT+CSQ

If this is not a 3G/4G modem issues, than re -explain what your trying to do?

note: you can't send AT commands if the modem is connected. The two modes or the modem is "command" and "data" mode. On the former mode allows for AT commands execution

[ashok_kumar]

Yes dear friend am using typical 3G modem and want to check the signal strength

[emnoc]

Than try that command from the fortigate and see if you get the level reading.

Also if you need to reposition the usb-modem, it found that extending it with a  usb-extension cable or  use a fortiExtender can help.

What I found;  that placing the modem in the  back facing usb-slot, sometime hampers and restrict the modem receive signal strength. A simple & cheap, 2ft  usb-2-usb extension cable  allow you a slight degree or arranging  the modem position.

In other cases, you will need to  use a fortiextender  or purchase a usb-modem with a external sma like antenae input & use a GSM antennae with a high gain.

I was very lucky, that in all of my  12 remote sites with 3g usb-modem backhual only two had poor RSSI level, &  in the -88-90dBm  range. Most of the other locations runs around -65 to -77dBm  24-26asu YMMV

With lower RSSI , you will experience poor packet lost which will impede  realtime sensitive applications or udp   applications

I hope this was  helpful.