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SFP3MRHDSDI-RX Datasheet(PDF) 2 Page - MRV Communications, Inc. |
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SFP3MRHDSDI-RX Datasheet(HTML) 2 Page - MRV Communications, Inc. |
2 / 5 page Datasheet Digital video signaling includes a data scrambling algorithm for SDI and HD-SDI that is not easily transported over a standard optical transport system. This algorithm can produce a signal pattern that causes an error in standard optical systems. With a certain pattern in the video data, the scrambling algorithm can generate a pathological signal containing a series of up to 19 bits of the same polarity. These pathological patterns are not transportable over optical transport systems that employ “off the shelf” optical components. These components are generally designed to use an AC-balanced signal with a duty cycle of approximately 50%. That allows the optical transceiver to properly modulate the laser control loop (transmit side) and lock (PLL circuitry) its receiver. Until now, the industry has addressed this problem by providing optical components specifically designed for use with the pathological signaling of digital video: typically DC-coupled optical transceivers. This approach requires customized transceivers for each combination of distance, wavelength, and fiber type (multi-mode or single-mode) used. Specialized solutions must also be built for WDM applications. Such designs are purely proprietary, and therefore tend to be expensive. Unfortunately, DC-coupled transceivers generally have up to 8 dB lower receive sensitivity than AC-coupled components, and they cannot be amplified in a DWDM application. This sensitivity loss reduces link range by as much as 35 kilometers. In contrast to the situation with digital video specialty components, the optical Multi-Source Agreement (MSA) has led to a ready supply of inexpensive optical interfaces for most applications. However, the specific digital video solutions cannot use this huge selection of standard and affordable optical components. The general-purpose type of optical transport platform (multi-rate/multi-protocol transponder or repeater) simply cannot handle digital video. Video Extension Over Fiber Film Studio Post Production Facility Digital Video over Coax (0-350 m) Digital Video over Coax (0-350 m) Fiber Optic SDI Link 0-120+ km Data Direction Data Direction SDI SFP Data Direction FO SFP FO SFP The optical SFP transceiver on the other side of the fiber link receives the SDI data signal. The EM316DMR3G-3R (Dual Multi- rate Transponder) passes the SDI signal to the SFP-CXASI-TX, and delivers it to the end point video device. The SFP-CXASI-RX, here mounted in a Fiber Driver EM316DMR3G-3R, receives a unidirectional SDI signal from a connected video device. The SDI signal is then transmitted over fiber via a standard SFP optical transceiver. 2 |
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