All clear now, that's exactly what I was after! Thank you very much.
P.S. Would it be OK for me to take on to fix this, i.e. to come up with a meaningful way of describing the signal quality? On 18 April 2010 05:00, Thanasis <[email protected]> wrote: > Hi, > > Thanks for bringing this up. During the years, I've always thought of > changing this stupid conversion (a relic of the past) but it always > slipped my mind... > > I am copying from GSM 07.07(-200): > > 8.5 Signal quality +CSQ > Table 52: +CSQ action command syntax > Command > Possible response(s) > +CSQ > +CSQ: <rssi>,<ber> > +CME ERROR: <err> > +CSQ=? > +CSQ: (list of supported <rssi>s),(list of supported <ber>s) > Description > Execution command returns received signal strength indication <rssi> > and channel bit error rate <ber> from the ME. Refer subclause 9.2 for > possible <err> values. > Test command returns values supported by the TA as compound values. > Defined values > <rssi>: > 0 ?113 dBm or less > 1 ?111 dBm > 2...30 ?109... ?53 dBm > 31 ?51 dBm or greater > 99 not known or not detectable > <ber> (in percent): > 0...7 as RXQUAL values in the table in GSM 05.08 [20] subclause 8.2.4 > 99 not known or not detectable > Implementation > Optional. > > I am afraid I cannot answer your last question... > > On Apr 17, 10:13 am, npetrovic <[email protected]> wrote: > > Hi all, > > > > I have some questions/clarifications re getting the signal level from > > the modem. > > > > I'm using a Huawei modem via USB. > > > > In getSignalLevel (ModemGateway.java) we have: > > > > response = getATHandler().getSignalLevel(); > > > > Following the trail in the code this leads to (ATHandler.java): > > > > getModemDriver().write("AT+CSQ\r"); > > return (getModemDriver().getResponse()); > > > > which effectively does the job (for my modem anyway). > > > > The string that we get back is something like "+CSQ: 14,99OK" > > > > getSignalLevel in ModemGateway.java converts it to an int given by > > (for the above case): 14 * 100 / 31 = 45 (%). > > > > My questions are: > > > > * What does the return string really mean (i.e. is it "signal is 14 > > out of 99)? > > * Why do we multiply by 100/31 ? > > * How do I get the signal strength in dBm, which is what I am really > > after? > > * In any case, what is the signal value that we get: before > > demodulation, or after? If it is after, which standard was > > demodulated. > > > > Thanks! > > > > -- > > You received this message because you are subscribed to the Google Groups > "SMSLib User Group" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > [email protected]<smslib%[email protected]> > . > > For more options, visit this group athttp:// > groups.google.com/group/smslib?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "SMSLib User Group" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<smslib%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/smslib?hl=en. > > -- You received this message because you are subscribed to the Google Groups "SMSLib User Group" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/smslib?hl=en.
