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Mohammad Hosein mhtajik at gmail.commost of the test systems are not built to be used for on-air operations .
the ones that offer such features must be used in Shield rooms where no
signal gets in or out . these rooms are expensive but usually tech
universities have some rental hours for their shield and antenna rooms . its
expensive as well , otherwise you are probably going to have some conflict
with local regulatory sooner or later
regards
On Thu, May 19, 2011 at 9:04 PM, Gianni Tedesco <gianni at scaramanga.co.uk>wrote:
> On Fri, 2011-05-13 at 15:00 +0430, Mohammad Hosein wrote:
> > you could use most GSM test systems for such purpose . on ebay you
> > might find very cheap ones
> > regards
>
> I managed to track down a Racal 6103. It should arrive in next couple of
> days.
>
> As a followup question then, I guess that these are intended for wired
> rf connection or at least they transmit at very low power, and tell the
> phone to do the same.
>
> However, one would feel a lot better using a channel unused by other
> cells in my location. I've been using cell_log to put together a list of
> active ARFCN's that my handset receives broadcasts from. Script for
> parsing cell_log logs is attached.
>
> Am I to conclude that if cell_log hasn't dumped:
>
> [sysinfo]
> arfcn 99
>
> for example, after running for a reasonably long period of time (say
> 24hrs) that operating test equipment on channel 99 should be safe?
>
> Gianni
>
> --
>
> #!/usr/bin/python
>
> def getline(f):
> while True:
> l = f.readline()
> if not l:
> raise StopIteration
> l = l.rstrip('\r\n')
> if not l:
> continue
> yield l
> def bsic(v):
> (a,b) = v.split(',')
> return (int(a),int(b))
>
> def hexdump(v):
> ret = bytearray()
> for x in v.split():
> ret.append(int(x, 16))
> return ret
>
> class Parser:
> pass
>
> class Power(Parser):
> def line(self, s):
> return
>
> class mcc:
> tbl = {0x234: 'UK and Northern Ireland'}
> def __init__(self, num):
> x = ((num & 0xf00) >> 8,
> (num & 0xf000) >> 12,
> (num & 0xf))
> self.val = (x[0] << 8) | x[1] << 4 | x[2]
> def __int__(self):
> return self.val
> def __str__(self):
> return self.tbl.get(self.val, '%.3x'%self.val)
>
> class mnc:
> tbl = {0x15: 'Vodafone',
> 0x30: 'T-Mobile',
> 0x10: 'O2',
> 0x33: 'Orange',
> }
> def __init__(self, num):
> x = ((num & 0xf0) >> 4,
> (num & 0xf))
> self.val = (x[1] << 4) | x[0]
> def __int__(self):
> return self.val
> def __str__(self):
> return self.tbl.get(self.val, '%.2x'%self.val)
>
> class SystemInfo:
> pass
>
> class SystemInfo3(SystemInfo):
> def __init__(self, b):
> if isinstance(b, str):
> b = hexdump(b)
> assert(b[0] > 9) # len
> assert(b[1] == 0x06) # discr
> assert(b[2] == 0x1b) # sysinfo3
> self.cell = (b[3] << 8) | b[4]
> self.mcc = mcc((b[5] << 8) | b[6])
> self.mnc = mnc(b[7])
> self.lac = (b[8] << 8) | b[9]
> def __str__(self):
> return 'Cell(%s, %s)'%(self.mcc,self.mnc)
>
> class SystemInfo4(SystemInfo):
> def __init__(self, b):
> if isinstance(b, str):
> b = hexdump(b)
> assert(b[0] > 7) # len
> assert(b[1] == 0x06) # discr
> assert(b[2] == 0x1c) # sysinfo4
> self.cell = None
> self.mcc = mcc((b[3] << 8) | b[4])
> self.mnc = mnc(b[5])
> self.lac = (b[6] << 8) | b[7]
> def __str__(self):
> return 'Cell(%s, %s)'%(self.mcc,self.mnc)
>
> class Sysinfo(Parser):
> _keys = {'arfcn':int,
> 'time':int,
> 'rxlev':int,
> 'bsic':bsic,
> 'si1':hexdump,
> 'si2':hexdump,
> 'si2bis':hexdump,
> 'si2ter':hexdump,
> 'si3':SystemInfo3,
> 'si4':SystemInfo4,
> 'ta':int}
> def line(self, s):
> (k,v) = s.split(None, 1)
> if self._keys.has_key(k):
> setattr(self, k, self._keys[k](v))
> else:
> print k, v
> return
>
> class RFMap:
> arfcns = {}
> cells = {}
> def commit(self, obj):
> if isinstance(obj, Sysinfo):
> self.arfcns.setdefault(obj.arfcn, {})
> self.arfcns[obj.arfcn][str(obj.si3.mnc)] = None
> self.arfcns[obj.arfcn][str(obj.si4.mnc)] = None
>
> self.cells.setdefault(obj.si3.cell, {})
> self.cells[obj.si3.cell][str(obj.si3.mnc)] = None
> elif isinstance(obj, Power):
> return
> assert(isinstance(obj, Parser))
>
> def rf_map(f):
> smap = {'[power]':Power, '[sysinfo]':Sysinfo}
> obj = None
> m = RFMap()
>
> for x in getline(f):
> if x[0] == '[':
> if obj is not None:
> m.commit(obj)
> obj = smap[x]()
> continue
> if obj is None:
> raise ValueError, 'Bad state'
> obj.line(x)
>
> if obj is not None:
> m.commit(obj)
>
> print 'Active ARFCNs:'
> x = m.arfcns.keys()
> x.sort()
> for i in x:
> print ' %4d:'%i, ','.join(m.arfcns[i])
> print
>
> print 'Active Cells:'
> x = m.cells.keys()
> x.sort()
> for i in x:
> print ' 0x%.4x'%i, ','.join(m.cells[i])
> print
>
> def main(argv):
> if len(argv) > 1:
> infile = open(argv[1])
> else:
> from sys import stdin
> infile = stdin
>
> rf_map(infile)
> return 0
>
> if __name__ == '__main__':
> from sys import argv
> raise SystemExit, main(argv)
>
>
>
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