Meaning of last digit of "%CSQ: 99, 99, 0"

[William Kenworthy]

On Sun, 2009-01-25 at 12:20 +0200, Timo Juhani Lindfors wrote:
> William Kenworthy <billk at iinet.net.au> writes:
> > Does anyone have an idea what the meaning of the last digit is?
> >
> > (watch screen wrap :)
> > Feb  1 09:11:42 om-gta02 user.notice root: AtChat :  N : "%CSQ:  99, 99,
> > 0"
> >
> > The first 99 is signal strength (99=unknown), second is BER
> > (99=undetectable) but all the guides Ive looked at dont mention the
> > third - so far I have seen, 0, 1 and 2 there.
> 
> 8.5  Signal quality +CSQ
> 
>                     Table 36: +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.
> 

Yes, thats the first two which I already gave, but whats the third (the
zero on the end, which may also be a 1 or 2)?

BillK