Logical Architecture of An ASON
The logical architecture of an ASON can be divided into 3 planes:
- Transport Plane
- Control Plane
- Management Plane
The Transport Plane contains a number of switches (optical or otherwise) responsible for transporting user data via connections. These switches are connected to each other via PI (Physical Interface).
The Control Plane is responsible for the actual resource and connection management within an ASN network. It consists of a series of OCC (Optical Connection Controllers), interconnected via NNIs (Network to Network Interfaces). These OCCs have the following functions:
- Network topology discovery (resource discovery)
- Signaling, routing, address assignment
- Connection set-up/tear-down
- Connection protection/restoration
- Traffic engineering
- Wavelength assignment
The Management Plane is responsible for managing the Control plane. Its responsibilities include Configuration Management of the Control Plane Resources, Routing Areas, Transport resource in Control Plane and Policy. It also provides Fault Management, Performance Management, Accounting and Security Management functions. The Management Plane contains the Network Management Entity which is connected to an OCC in Control Plane via the NMI-A ( Network Management Interface for ASON Control Plane) and to one of the switches via NMI-T ( Network Management Interface for the Transport Network).
The traffic from user connected to an ASON network contains data for both Transport and Control Plane. The user is connected to Transport plane via a PI (Physical Interface), while it communicates with the Control plane via a UNI ( User Network Interface).
Read more about this topic: Automatically Switched Optical Network
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