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ry Co ive Del Ask the experts >> over the transmission distance and a great deal of scattering of the light. Think of the light emanating from the headlight of a car and the resulting light that is cast 30 meters down the road. Over time, single mode fibre became available with a core size that was only 1/10th the core size of multimode fibre. This allowed laser sources to be used with a very coherent single mode of light and resulted with light being transported over the fibre with very low attenuation and dispersion. As a result, an extremely large amount of information could be transported over great distances creating a medium with virtually infinite bandwidth over distances commonplace in the broadcast environment. For this reason the broadcast community will invariably use single mode fibre when given the choice. Ironically, the single mode fibre is actually less expensive then multimode fiber types. So, why would multimode fiber be used at all given a choice? Mainly due to influences from the IT community that do not have the same signal integrity issues that are in broadcast signals and have more stringent cost considerations for the interface devices between their IT equipment and the fibre. What advice can you offer broadcasters and video professionals who want to make the switch from copper to fiber in their facility? Think about fibre from the very start of the project design. Design with a clean sheet of paper to take advantage of the unique characteristics and products that fibre has compared to copper. Too many times a designer will create a copper based system and then use fibre here and there simply to substitute for the long cable runs that are too great for copper. This is shortsighted and fails to take advantage of fibre for bandwidth, aggregation of baseband signals, low signal distortion and point to multipoint distribution. ASK OUR EXPERTS 36 | TV-BAY MAGAZINE Keep in mind future system expansion too. The cable infrastructure you install will probably be needed for many years into the future. While copper might be adequate for today’s signal needs, will it be adequate for what this industry has in mind for the future? The cost of a cable infrastructure and its installation can be a major expense component of any project. You want to be able to leverage that investment far into the future. The second thing I would offer is to start small with fibre. If you are new to fibre you undoubtedly have some concerns and little, if any, experience. That’s OK, we all have to start somewhere. So, install a simple point-to-point link for SDI and run a non-critical signal through it. See how it holds over time and under various operating conditions. Compare it to coax for economy and performance. Over time you’ll get confidence and the experience to expand to larger and more complex installations. What new products are you highlighting at your booth this year? Can you tell me about their key features? We continue to create products under our Fiberlink® brand that aggregates the transmission of multiple baseband signals over one fibre with just one product. This is the best way to offer value to the customer and exploit the unique properties of fibre technology. Our Fiberlink 8200 ODA (Optical Distribution Amplifier) is unique in the industry for optical distributing 3G/HD/ SD-SDI over fibre from either a copper of fibre input. The ODA has up to four (4) independently buffered and laser driven outputs. Both single mode and multimode fibre is supported and the units may be looped or cascaded to create a wide array of point-to- multipoint distribution topologies. The Fiberlink 3380 Series embeds 4 channels of analog audio into a 3G/ HD/SD-SDI signal, then transports it over fibre. The Fiberlink 3381 does POST YOUR QUESTION ONLINE: Search ‘tvbay’ Tel. +44 (0)1635 237 237 Email. questions@tv-bay.com the de-embedding from the fibre optic input. The product is fully SMPTE compliant. These are the perfect compliments to our 3360 Series for embedding and de-embedding AES/ EBU audio in a fibre optic system. The Fiberlink 3370 is a perfect example of how several different baseband signals can be aggregated into to one box and transported over one inexpensive fibre core. In this product, 3G/HD/SD-SDI, 10/100 Base-T Ethernet and two RS data channels are transparently transmitted without any compression. It’s perfect for PTZ SDI cameras. Our new Copperlink™ product line will have two new additions. The 2380 is a standalone 4-channel analog audio embedder and the 2381 is a 4-channel analog audio de-embedder. Both support 3G/HD/SD-SDI signals and user selectable Group assignment. The NY-based Communications Specialties, Inc. (CSI) is the manufacturer of a variety of products for the distribution, conversion or transmission of television and computer video signals, including fiber optic transmission systems, scan converters and video scalers. The company’s widely used FiberlinkÒ line includes the venerable 3350- Series, which was one of the first fiber optic links to transmit 3G-SDI over one single mode or multimode fiber in the same unit. Since then, numerous Fiberlink products have been introduced, with several new additions on display at NAB 2012. The Fiberlink family provides support for nearly every signal format being used in professional video today. In 2011, CSI launched CopperlinkÔ, a series of copper based 3G/HD/SD-SDI distribution and conversion products that directly complement their Fiberlink counterparts. The line was launched with the introduction of the 2302 1x2 3G/HD/SD-SDI distribution amplifier, the 2304 1x4 3G/HD/SD-SDI distribution amplifier and the 2353 3G/ HD/SD-SDI to HDMI converter. More information on Communications Specialties can be found at: www. commspecial.com