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Synchronous Optical Networking
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SONET (standing for Synchronous Optical Networking) is a standard for communicating digital information over optical fibre. It was developed to replace the PDH system for transporting large amounts of telephone and data traffic.
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From the late 1980s to as recently as 1996, Synchronous Optical Networking (SONET) and Synchronous Digital Hierarchy (SDH) were the hot discussion topics, being billed as the backbone technology standards of all future telecommunications. By 1997, wavelength division multiplexing (WDM) suddenly became the item of greater interest, as managers and technical gurus realized that multiple wavelengths could increase capacity of existing installed fiber to 100 Gbit/s and beyond, without the problems that time division multiplexing (TDM) presented at greater speeds.
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MultiService Provisioning Platforms (MSPP) are the largest optical equipment segment tracked by IDC and it continues to steal share from legacy SONET/SDH multiplexers. MSPPs post a staggering 36% growth with a market value worth US$1.2 billion in 2006, accounting for more than 50% of total optical networking equipment deployment. The revenue of MSPPs will increase at a compound annual growth rate (CAGR) of 10.2% from 2006 to 2011 to reach US$1.8 billion, according to IDC's latest report Asia/Pacific Semiannual Optical Networking Equipment Tracker with 2006-2011 Forecast.
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The need for optical standards led to the creation of the synchronous optical network (SONET). SONET standardized line rates, coding schemes, bit-rate hierarchies, and operations and maintenance functionality. SONET ... defined the types of network elements required, network architectures that vendors could implement, and the functionality that each node must perform. Network providers could now use different vendor's optical equipment with the confidence of at least basic interoperability.
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Haliplex claims that it is the only vendor designing and manufacturing optical networking (ON) solutions in the Southern Hemisphere. The company currently offers two leading edge communications products to the market. The HPX-600 ON multiplexer and the HPX-300 channel bank multiplexer. The HPX-300 lends itself to the channel market due to its entry price point (approximately $5,000) and reduced complexity compared to the HPX-600.
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Perhaps the most robust protection architecture for optical networks is the optical ring. Optical rings operate identically to their electrical ring equivalents, with the same architectures and alternatives available. Although they require more fiber than other restoration schemes, optical rings provide the highest level of availability. By partitioning wavelengths into groups, network planners can switch certain wavelengths in the optical layer while still performing switching for existing systems in the SONET layer. The partitioning allows a smooth evolution to optical rings.
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Synchronous Optical Networking