J3U Video 3 of 3 – Transcription
In a previous video, we reviewed some of the high-level features of the Optical Zonu J3U chassis. In this video, we are going to concentrate on a few of the newer modules. Those are the signal diversity, or the redundancy modules, both optical and RF. The RF redundancy modules may be either 50 Ohm or 75 Ohm. There are various configurations of these redundancy modules. The basic building blocks of all these modules, at a very basic level, are 1:2 splitters. Those may be either optical or RF. In the diagrams here, green is RF and blue is optical. In addition to the splitters, we also have optical and RF 2:1 switches, switching one of two inputs to one output. Again, for both optical and RF, Optical Zonu has 2:2 switches which have two states; straight through or crossover of two inputs to two outputs. Larger building blocks may be constructed from several of these. One is the OTB, and another is the ORB. We will show how these are used in a couple of basic redundancy architectures. Redundancy can be built into the system on both the optical and the RF level. I have shown a couple of examples here. In the simplest example we are implementing a redundant fiber. Neither the fiber optic transmitter nor the fiber optic receiver is protected in this case, we are just offering a diversity of paths using simple optical switches. This is 1:1 redundancy in the fiber. We could also (although it is not shown on this diagram) have an additional transmitter to receiver fiber optic link, and switch between the two in the RF domain. In addition to 1:1 redundancy, Optical Zonu also provides a combination of modules for doing N+1 redundancy. This could be represented by four primary fiber links and one redundant fiber link that will replace a failed link. There may be eight primary fiber links and one redundant that will replace a failed link. For the case shown here, a simple N+1 (where N = 2) architecture is illustrated. This consists of two primary fiber optic links (transmitter to receiver) and a spare transmitter to receiver link. In this case, either of the primary transmitters can fail and the one spare transmitter will take its place. Likewise on the receiver side, if one of the primary receivers fail, the spare receiver will take the place of the failed receiver. If I follow the drawing here very quickly, if no transmitter or receiver fails, the RF signals pass straight through transmitter to receiver. If this primary transmitter were to fail, then the second primary transmitter would pass straight through, however the spare transmitter would switch like this, to this input, and replace the failed transmitter. Likewise, if this primary transmitter were to fail, the second primary transmitter would pass straight through to its receiver, however this 2:2 switch would switch states and the spare transmitter would replace the failed transmitter. A similar example could be shown for the case of a failed primary receiver. That is a basic overview of the building blocks of the RF and optical redundancy modules of the Optical Zonu J3U chassis. For more information, visit our website at www.opticalzonu.com. Thank you for watching.