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Call drops in GSM network can be caused by the following:
i) Equipment: GSM radios/Combiners can be a cause of this, solution to this is replacement of the unit. A Mobile Station(phone) can also be a cause.
ii) VSWR (voltage wave standing ratio): VSWR caused by poor connections on feeders, water penetration, fault on antenna etc
iii) Transmission problem: If transmission is not perfect, high B.E.R (Bit error ratio) or other factors causing inaccuracy of transmission.
iv) Interference: when there's frequency interfere (either co-channel or adjacent interference).
v) Hand-over: if hand-over between two sectors is not well defined.
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