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Marcel Klein marcel at koeln.ccc.deDieter Spaar wrote:
> I am rather sure this is an issue with the BS-11 clock. It requires a
> very accurate and stable clock for GSM (in my tests with just one
> phone a BTS clock detuned by about 1 ppm causes the phone to no longer
> see both test network and official network). There are most certainly
> differences between the phones too in regards to how much inaccuracy
> they tolerate.
>
> You can make a test to see if it is a problem with the clock: take a SIM
> card from a phone which is registered (location updated has been done)
> to the BS-11 network and put it in a phone which did not find the
> BS-11 network. Now the phone should be able to see the BS-11 network
> when powered on because it immediately listens on the ARFCN of the
> BS-11 and does not register (and synchronize its clock) to an
> official network first. However it most certainly will no longer
> find the official networks.
Yep you are right. Tried that just now.
Hm wouldn't it be possible to sync our clock with the official networks
(without an extra ISDN-line)? Somebody told me that there are several
ways to sync the clock. Here we discussed the ISDN way, but somebody
told me that it should also be possible to set the clock over GPS and/or
other networks in our area.
kenny_