On 02/gen/10, at 18:16, p q wrote:
Passive systems are always more expensive not because of the
technology because of their features . in reality , building an
Active system is much much harder than a passive system . reason is
the Close nature of GSM society , difficulaties to have access to L1
layer of MS and BTS without paying millions and dollars and signing
NDA . there are currently only 2 different GSM active system on the
market . but there are a couple of Passive systems available . all
only sell to government . to buy , you need a letter of introduction
from your embassy in the target country that confirms you work for
the government . of course these things always get smuggled out of
government for illegal usages but generally they are controlled and
trackable
On the control only 'for government use' .
I googled a bit, i asked to several companies and got quotation in 2
days with delivery in some 'well known offshore place' in middle east.
Without any recommendation or verification about the 'kind of usage'
and 'who i am'.
Quote from offer i got in mail:
"Passive GSM Monitoring system will handle A5.0 & A5.2 encryption
scheme only and will NOT decipher A5.1.
· 2 Duplex channels: US$ 280,000.00
Semi Active GSM Monitoring System, ,is capable to decipher A5.0, A5.1
and A5.2
· 4 Duplex Channels +1 Paging Channel (Single Band- 900 MHz
or 1800Mhz) : US$ 625,000.00
• Payment Terms: 100% Advance Remittance upon signing of
contract.
• Delivery Schedule: 3-4 weeks after receipt of Confirmed
Purchase order and Export License.
• Training: The price is inclusive of training expenses.
Stratign will NOT charge extra for the training, travel and
accommodation costs for our two technical engineers shall be borne by
the customer. The training shall be provided for seven days to a group
of up to 5 personnel.
In case of extended training, the customer will be charged US$450 per
engineer per day.
Should you require any further details to conclude the order please
feel free to contact me. "
Fabio
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