From Hu, 2011
In a Automatic Switched Network 3 types of connections are possible, they vary in terms of the lasting time of the connection, and they are:
Permanent connection –usually a static connection that last for months or years. It is setup manually or by management system.
Switched connection: established on demand though routing and signaling capabilities of the control plane. Requires a user-network signaling interface. Are setup within seconds, enabling bandwidth on demand. Promotes optimization of resource utilization and traffic engineering mechanisms.
Soft permanent connection: two permanent connections are specified at the edge of the network, a switched connection is setup within the network. Soft permanent connections are triggered by management plane, but are setup within the network by the control plane. They may support TE, dynamic re-establishment of failed connections and time varying bandwidths.
Hu, W.; Sun, W.; Jin, Y.; Guo, W.; He, H. & Yi, L. (2011), 'Sub-Wavelength Switching for Future Internet'' 13th International Conference on Transparent Optical Networks (ICTON), 2011'
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