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Shared medium network architectures

Some of the best-known types of shared medium architectures are CSMA/CA, CSMA/CD and token (ring, bus) passing architectures. These architectures operate in layers 1 and 2 of the OSI reference model. The basic entity that is transferred across the medium is called a frame.

Both CSMA and token passing architectures maintain information sequence integrity and prevent information duplication. In both networks, the delay and jitter depends to a significant degree on the load on the medium. This is clearly a problem for VoIP networking. In CSMA architectures the jitter cannot be controlled at all. In token passing architectures the jitter can be limited by ensuring that all stations get fair access to the medium


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