Posts tagged: pon

Next-Generation PON will Support at Least 40 Gbps Downstream

By admin, July 18, 2012 8:50 pm

What the next generation of fiber-to-the-premises networks will look like is becoming clear, now that members of the Full Service Access Network (FSAN) have reached an agreement on what they’re calling NG-PON2.

The agreement is not actually a standard, but instead outlines the direction that standards efforts will take, explained FSAN Chair Martin Carroll, who is also a distinguished member of the technical staff at Verizon?(News – Alert).

As FSAN considered the next generation of FTTP, various members proposed a wide range of approaches, including some that were “more elaborate and on the bleeding edge” and some that were “more current and readily available,” Carroll said.

Members ultimately settled on what they’re calling time and wavelength division multiplexing (TWDM) because the group believes that approach will meet target bandwidth and other requirements and can be developed relatively quickly. Standards could be ratified by as early as 2013 and products could be deployable by 2015, FSAN says.

Like today’s FTTP networks based on GPON, TWDM will rely on time division multiplexing but in addition will “use multiple wavelengths to stack TDM streams,” said Carroll.

The minimum bandwidth goal for an individual NG-PON2 is 40 Gbps downstream and 10 Gbps upstream, with total bandwidth shared among multiple subscribers. Noting that the current highest-speed PON, XG-PON, operates at 10 Gbps downstream, Carroll said the minimum target bandwidth levels should be easily reachable by using four wavelengths.

He added that systems with downstream bandwidth as great as 160 Gbps could be part of the standard, but he believes the 40 Gbps system will be considerably more cost effective.

The 40 Gbps requirement was driven by the per-customer bandwidth goal of 1 Gbps and apparently envisions each PON continuing to serve about 32 customers as with typical PONs deployed today. But bandwidth will not have to be allocated equally between all of the customers served from a single PON. Carroll believes network operators are likely to give residential customers service at rates below 1 Gbps, while business customer data rates will start around 1 Gbps.

Operators envision a wide range of use cases for NG-PON2, including support for mobile backhaul and potentially as a replacement for Sonet and SDH-based data services. Because NG-PON2 will use a point-to-multipoint approach, Carroll expects it to be more cost effective than point-to-point alternatives.

I asked Carroll whether the people creating the NG-PON2 standard would consider home run wiring – an approach that is gaining in popularity because some operators believe it is more future-proof than PON. Carroll said the emphasis is on PON, but he noted that the group also wants to have some wavelengths available for using WDM technology in more of a point-to-point configuration.

“It would be a PON architecture on the fiber side, but when you look at what the signal itself does, it would be more of a point-to-point allocation of the wavelength,” he said.

FSAN initially was primarily a North American organization dominated by the former RBOCs, but over the last decade it has become a much more global organization – and that reality has driven some of the requirements for NG-PON2. Carroll noted, for example, that NG-PON2 must co-exist not only with GPON, which has been widely deployed by Verizon, but also with XG-PON. The latter requirement was driven largely by China Telecom and China Unicom?(News – Alert), Carroll said.

FSAN expects to work through the International Telecommunications Union in creating the NG-PON2 standard – another example of the global nature of the technology. online casino .


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Edited by Braden Becker

Market Demand for 10G EPON Equipment Is Weak

By admin, November 17, 2011 11:43 pm

According to market research firm OvumĀ (News – Alert), despite the availability of components and equipments, market demand for the 10 Gbit per second Ethernet Passive Optical Network standard, also known as 10G EPON, outside of China will remain low until 2013. In a new report, the independent telecoms analyst states that while components companies have been under pressure by equipment vendors and service providers to develop 10G EPON components, the momentum has slowed down.

In a statement, Julie Kunstler, Ovum analyst and author of the report, commented, “The pressure worked and multiple vendors have commercial-ready 10G EPON components and testing has been carried out by service providers… However, while several provinces in China have begun deployments, 10G EPON equipment deployments will remain negligible until late 2012 in China, and 2013 for other global regions,” added Kunstler. “Demand for XG-PON will also remain low, although the readiness of XG-PON components and equipment is lagging that of 10G EPON,” continued Kunstler.

As per the Ovum report, demand for 10G EPON and XG-PON has slackened for several reasons. casino online . Firstly, China’s service providers are favoring the deployment of fiber-to-the-home (FTTH) versus fiber-to-the building (FTTB) due to the operational costs of FTTB and competition around bandwidth.

Meanwhile, although the use of 10G PON for wireless backhaul traffic remains a strong market driver, commercial deployments are still few and far between. casino online . In addition, the costs of PON OLT and ONU/ONT equipment, for both GPON and EPON, have dropped significantly, widening the cost gap between 10G PON and 1G EPON and 2.5G GPON, says Kunstler.

While Kunstler concedes that price is a hindrance, she does not believe it will remain a long-term problem. Consequently, Kunstler commented, “The costs of 10G PON optics and equipment will decline rapidly once purchase orders are signed and deployments begin. A bigger problem is the lack of applications for 10G PON.”

“The plan for upgrading 1G EPON FTTB MDU equipment to 10G EPON equipment was simple and straightforward, involving the same service provider and subscribers on an existing FTTx (fiber-to-the-x) network. While this application still exists, the volume of replacements will decline as some FTTB-based MDUs are moved to the FTTH, concludes the analyst.

Ashok Bindra is a veteran writer and editor with more than 25 years of editorial experience covering RF/wireless technologies, semiconductors and power electronics. To read more of his articles, please visit his columnist page.

Edited by Rich Steeves