Abbreviation Part - II
| VHF | Very High Frequency |
| UHF | Ultra High Frequency |
| AM | Amplitude Modulation |
| FM | Frequency Modulation |
| ELF | Extremely Low Frequency |
| EHF | Extremely High Frequency |
| RADR | Radio Detection and Ranging |
| ISM | Industrial , Scientific and Medical |
| PCU | Packet Control Unit |
| MSC | Mobile Switch Center |
| VLR | Visitor Location Register |
| PSTN | Public Switched Telephone Network |
| HLR | Home Location Register |
| AUC | Authentication Center |
| EIR | Equipment Identity Register |
| GPRS | General Packed Radio Service |
| EDGE | Enhanced Data rate for GSM Evolution |
| SGSN | Serving GPRS Support Node |
| GGSN | Gateway GPRS Support Node |
| BSC | Base Station Controller |
| TE | Terminal Equipment |
| SIM | Subscriber Identity Module |
| BTS | Base Transceiver Station |
| LOS | Line Of Sight |
| NLOS | Non Line Of Sight |
| EM | Electro Magnetic wave |
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