The principal advantages of fiber optic cable as compared to copper cable are well known and include almost perfect electromagnetic isolation, light weight, compact size, excellent transmission security and substantially better bandwidth/distance performance.
Fiber optic technology has led to a new generation of private and industrial networks providing much larger bandwidths, high reliability and increased maximum geographical coverage.
OTN or “Open Transport Network”, is a transmission system specifically conceived for the needs encountered in industrial environments. OTN is based on the latest fiber optic technology to fulfill the requirements of said environments.
An industrial network is characterized by heterogeneous communication requirements.
You will find all types of communication, such as voice, data, video, audio, etc.
Moreover, the critical nature of all applications in case of incidents imposes requirements regarding back-bone reliability and resilience, whereas the economic constraints imply a low network operating cost. The industrial environmental conditions also dictate the equipment’s level of robustness. Finally, the industrial domain prefers systems that are easy to install and easy to use, while being able to operate and develop over 10-15-year life cycles.
As such, OTN can fulfill all these requirements for such environments.
1.1 What is OTN?
OTN is exactly what its name implies:
Open It can handle nearly all existing physical interfaces via its interface cards.
Transport It carries different types of information (such as voice, data, digital video and LAN) completely transparently throughout the network.
Network It is based on fiber optic technology in a future-proof network infrastructure, over virtually unlimited distances.
OTN is the ideal solution for mixed environments that are found in many stretched networks in e.g. the transportation environment of metros, railways, light rail, motor-way systems, mines and airports, along oil, gas or water pipelines, in electricity distribution networks and in the petrochemical and chemical industries.
OTN, the Secure Investment
In this so called “Information Age”, communications infrastructures have to cope with rapidly changing requirements (e.g. increasing video applications).
OTN grows smoothly with these new requirements and services. Its easy migration capability from one environment to another by simply adding interface cards, makes it a system that can be used for years to come.
Different bandwidth requirements are met by the respec-tive members of the family, i.e. the 150 Mb/s, 600 Mb/s, 2.5 Gb/s and 10 Gb/s versions, with smooth upgrading capabilities from one version to another.
The OTN system features many advantages when com-pared to dedicated networks for voice, data, LAN and video transmission, or compared to the traditional digital transmission systems in use today:
OTN System Adaptations
OTN comes with an extensive suite of interface cards. New industry standard and specific interfaces are developed as specific needs arise or standards gain momentum. OTN is the ideal platform for such developments.
1.2 OTN Features
Maximum Network Availability
System unavailability is restricted to a minimum, as the ring automatically recovers in error situations, also in the case of dual errors. This reconfiguration time is so short, that e.g. a telephone call is not interrupted while the ring is reconfiguring. During network expansion, adaptation or repair, the network remains operational thanks to:
Direct Access to the Network and Guaranteed Bandwidth
OTN guarantees direct access to the network at any time avoiding long access times and enabling real time applications. Each application has its own virtual connection because the transmission capacity on the backbone is allocated in a semi-permanent way, which means that the allocated bandwidth is always available for that application, independently of the other applications running on the network. OTN provides the optimum mix of fixed bandwidth (constant bit rate) for real-time traffic and packet based Ethernet traffic.
OTN guarantees reliable communication in office as well as in industrial and transport surroundings. OTN uses optical fibers as transmission medium, offering a number of advantages over conventional copper wire conductors.
Diversity of Interface Cards
OTN provides a wide range of interface cards and can therefore be used for diverse applications. This diversity of interface cards eliminates the need for additional transmission equipment, such as protocol converters and conversion equipment.
OTN features interface cards for:
Geographical Extensiveness of the Network
The OTN network allows spanning very large distances (up to 1000 km (622 miles) or more).
Fast Error Detection and Simple Network Recovery
Any ring operation and interface card errors are reported centrally, and in part also locally.