OTN Systems – Open Transport Network Systems

ll applications, be it data, LAN, voice or video, can be directly connected to the wide range of interface cards which are available for the modular OTN nodes. The OTN interface cards convert the different analog or digital application interfaces to a digital format and pass it on to the node’s common control card (BORA) via the node’s backplane. The common control card will then insert the application data into a predefined Time Slot on the fibre optic backbone. At the destination node(s), the data is taken from the backbone and converted back to the appropriate digital or analog format.

The allocation of application data to dedicated time slots on the backbone is done by the OTN Management System (OMS). The OMS has an easy to use Graphical User Interface (GUI), and is used to configure and monitor the complete OTN network. However, since the nodes contain all configuration data, the OTN network can be operational without the presence of the OMS.

The use of optical fibre and laser technology, ensures that connections can be made over very long distances (e.g. more than 140 km (87 mile) between 2 nodes, network size >2000 km (1243 mile) with excellent transmission quality. To improve the reliability of the fibre optic backbone, a redundant fibre optic ring topology is used. This allows the OTN network to restore itself automatically in case of an optical fibre cable break. Multiple of these redundant OTN rings can be coupled to provide the optimal network topology.

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