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Please help me clarify with GSM monitoring system (active style and semi-active). I cannot differentiate these 2 types of monitoring systems. If anyone can tell me exactly how they operate? Thank you in advance.

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closed as off topic by AviD Aug 14 '12 at 7:08

Questions on Information Security Stack Exchange are expected to relate to Information security within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here. If this question can be reworded to fit the rules in the help center, please edit the question.

Hi @gem, welcome to Information Security. This doesn't seem to be a security question, as we would expect from questions on this site... please see the FAQ. If you do have a security-related question here, please edit it to clarify, and then ping me or another mod to reopen it. –  AviD Aug 14 '12 at 7:09

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