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G2B: 1-way 1and 2-way2Communication between the transmitter (PCU) and the receiver (CU)Communication can be:- in one direction only (one-way or simplex)- in two directions (two-way or duplex)- EU (433 MHz) and NAFTA (900 MHz) transmission frequencies- Automatic frequency hopping on 50 of the 67 channels available324/06/2011