Next Generation SDH/SONET: Evolution or Revolution

Performance Comparison of Traditional SDH and NG-SDH Networks for IP Traffic Transportation
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    T 9.1 Sonet Overview and evolution

    Comment Plenty of vendors have brought out next-generation Sonet chips in the past few months, paving the way for data traffic to be carried more efficiently over existing carrier infrastructure. Some of these chips also claim to support SDH, the transport protocol used in telecom networks everywhere outside North America.

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    But everyone's dirty little secret is that, in fact, they can't support next-generation SDH as effectively as they can support next-generation Sonet. That is, until yesterday, when startup West Bay Semiconductor Inc.

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    It will also be an invaluable resource for postgraduate students on network communications courses. Return to the Next Generation Communications Homepage. Web page addresses and e-mail addresses turn into links automatically. Email or Customer ID. Fig 1. Text format Comments Plain text. Therefore, the introduction of "dynamic switching" into traditional transport networks is a historic breakthrough in the long-term conceptualization of transport networks as well as an important revolution in transport network technology.

    The startup claims it has the only chip that brings the full benefit of the virtual concatenation technique -- a key element of next-gen Sonet -- to SDH. There are two issues: encapsulation protocols and granularity. Time to dig into the details. Encapsulation For starters, there's the issue of the best way to encapsulate packets for transportation over an SDH network.

    The Yanks have pretty much decided to do this using a protocol called generic framing protocol or GFP. Unfortunately, life isn't so simple outside America. LAPS is also on the rise in Europe. Even if it's not a requirement, supporting the "local" standard helps network equipment manufacturers feel more at ease, he adds. Nasdaq: TXCC. The other issue is: Granularity In the Sonet world, virtual concatenation involves glomming together the smallest channels -- STS1s For more on this issue, see: Tutorial on Grooming Switches.

    As a result, vitual concatenation provides a less efficient solution for SDH than it does for Sonet. West Bay says it overcomes this problem by building a chip that can see down to the VC3 level. West Bay's chip can deal with these complexities without worrying about the bizarre math that adds up three and gets four. Voice traffic has been eclipsed by data traffic due to changes in how end users choose to communicate with their cellular phones. Usage of broadband Internet access via mobile devices and wireless PC cards has driven mobile operators to look to new packet-based radio technologies such as 3G upgrades and new 4G LTE and WiMAX to improve the access speeds and reach of mobile broadband data services.

    For example, in the U. Consequently, with all of these RANs enabled for higher-speed data services, i. Support for end-user download speeds have grown from Kbps-1Mbps 2. In other words, these new mobile broadband technologies effectively meet or exceed standard fixed wired DSL or cable modem speeds and now are accessible from a mobile device.

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    Who might be deploying these new mobile broadband 4G LTE networks? These include: Verizon U. So how will these new higher speed backhaul connections be deployed? As much of the traffic becomes data- and video-focused content along with some voice, packet-based carrier Ethernet technologies offer the best bet for economical transport for these connections. Recent data from Infonetics, Jan. Further, as mobile traffic becomes increasingly packetized, new timing and synchronization techniques, will need to be employed to ensure clock synchronization can be accommodated for frequency accuracy, phase between base stations, and so time of day stamps can be employed at each base station.

    GPS clocking via satellite is also popular particularly in Japan as another method for providing appropriate timing and clock synchronization. Moreover, the size and form factor of the multi-service aggregation devices need to be extremely compact and hardened for deployments in remote cell sites. Eventually as next-generation radio equipment comes to market much of the multi-service aggregation technology will likely be integrated directly into the radio devices themselves.

    Last but certainly not least, new Ethernet mobile backhaul solutions will incorporate real-time SLA and performance-monitoring capabilities ensuring flow-based Quality of Service or QoS can be equitably accommodated at the tower itself. Operators are being pushed into the unenviable role of allowing all traffic types to pass without selectively policing or dropping customer traffic due to recent Net Neutrality regulations.

    Wireless backhaul really is not a revolutionary thought, but simply an evolution and mandated economical necessity for the existing predominantly voice centric cellular networks to migrate to the next phase of data-centric wireless mobile broadband networking. With nearly About the Author.