The main difference between ASON and traditional OTN is that an independent control plane is introduced to give intelligence to traditional optical networks. ASON has three connection modes: permanent connection, soft permanent connection and switched connection. The first two modes do not require strict user network interface, while the latter must have a clear user network interface, namely UNI, which is an important symbol for realizing switched connection. It can also be said that it is the introduction of UNI that makes ASON fully intelligent and truly automated.
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