MIL-STD-1553 uses twisted shielded wiring for the network. Each 1553 network will have two main busses, A and B. The information transmitted on each bus is identical, so if one of the buses fails the other bus can maintain communication between nodes. Each network requires one Bus Controller (BC) that will act as the master on the bus. The Bus Controller has sole control of bus transmission. A 1553 network can have multiple BCs, but only one may be active at a time. Other nodes on the bus are called Remote Terminals (RT). These can be any other electronic components, but they will only transmit on the bus when the receive a command from the BC to do so. A 1553 network can support up to 31 remote terminals, each having up to 31 sub-addresses. The bus can also have a Bus Monitor (BM) that passively reads bus traffic. They are not permitted to transmit on the bus, and are primarily used in testing.
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