Prospects For Gpon Technology
1, GPON technology features GPON for the FSAN (Full Service Access Network) and since the late 90’s the latest development of broadband PON standards, the ITU formally recognized in 2004 as ITU-TG.984 standard. GPON system consists of the core node or sink node is located in the central office OLT equipment room and at the customer premises equipment side of the ONT common form, a central office OLT ONT equipment control multiple devices. Two kinds of devices to connect fiber optic network by the single-mode fiber and passive optical splitter component.
OLT provides the network for the access network side and the interface between the MAN (TDM and Ethernet), optical distribution network through the connection with the ONT. PON system as a core function of the device and the central node, OLT has centralized bandwidth allocation, control of the ONT, real-time monitoring, operation and maintenance management functions of the GPON system. ONT side for the access network to provide the user interface, providing voice, data, video streaming and ODN multi-service access, centralized control by the OLT.
The way in technology, GPON is the PS-PON (power splitter PON) a, in the PS-PON, the downstream signal power at each branch point will be allocated, so can all ONU broadcasting, by each ONU / ONT is responsible for collection from the signal to extract its payload. The tree in such PON network, all ONU / ONT in the uplink signal splitter device through the main feeder section fiber multiplexing and OLT receiver for demultiplexing. ONT uses TDMA (Time Division Multiple Access) way to get OLT receiver resources.
Relative to the terms of the existing access network, GPON technology features are:
* High bandwidth and high transmission efficiency, downlink rates of up to 2.488 Gbit / s, the behavior of 1.244Gbit / s, operators can meet the future needs of the business access bandwidth, using GEM package approach, integrated transmission efficiency of 93%.
* Single fiber access, use of a single fiber to meet the ONT needs of the user’s access, you can save a lot of feeder operators in the access layer of fiber resources segment.
* Can support the access distance farther (more than 20km). FTTB systems for the development of their GPON OLT to the ONT can reach the furthest distance of 60km over access.
* As a carrier-grade technology standards, interoperability of equipment requirements in detail, the various business types can provide the appropriate QoS guarantee, GPON also provides the access network level protection mechanisms and full OAM capabilities, optical automatic switching time is less than 50ms.
* Located outside the optical distribution network, only the physical characteristics of a very stable medium and passive optical splitter, there is no active device, making the network with high reliability.
* In the access network level to provide a unified access platform, saving operators the cost of maintenance and handling failure.
2, applications and market forecasts As the major operators worldwide subscriber line loop transformation trend of growing convergence of views that subscriber line loop will be gradually replaced by the optical fiber, so the major carriers are currently under different applications and cost demand, while the deployment of FTTC, FTTB and FTTH systems, with the ultimate goal is to complete the full optical access network of the replacement.
Relative to the PTP system to PON technologies represented PTMP more from the start by the telecom operators of all ages. This is because people have long recognized the cost of FTTx applications will be the main obstacle, PON technology can make good use of fiber capacity of lowering costs, all the users and CO (central office) for more economic to connect without having to use remote terminal, ONT devices can share a number of CO in the optical interface.
Should be said that the most GPON technology enables applications where their skills is FTTH, but so far, for the transmission of telephone services, the use of PON technology for FTTH system is still unable to achieve “wire on the other,” the cost of requirements. But with the end business integration requirements and supporting technology development GPON, GPON FTTH large-scale applications in the future any more than before to be brighter and more FTTH technology.
Major North American and European operators have raised totally for GPON equipment, the user needs and requirements around 2008 into a large-scale deployment phase. Before that, GPON product applications more concentrated in the access layer of high-end applications, such as FTTO, FTTB comprehensive application of large customers and FTTB + LAN, FTTB + DSLAM applications, this application is relatively resource for the Fiber tensions emerging carriers are quite attractive. For example, in South America, Southeast Asia and India’s emerging telecom operators, their desire to quickly build for the future with low cost triple-play applications, access networks, using GPON technology to make them relatively easy to achieve this goal.
Forecast according to authorities, based on GPONFTTB applications ONU ports starting from 2007 will be more than 1000% per year rate of increase, the end of 2008 the world will have more than 440,000 GPONONU port applications. The application of the ONU based GPONFTTH number of ports will also be entered in 2007, explosive growth of around 200 million lines, but to rise a further doubling by 2008, more than 400 million lines of scale.
From around the world to see, PONFTTH application size is about 10 times the size of FTTB applications, but only FTTB profits more than 4 times, this can be seen GPON FTTB applications is also an important component access applications part. GPON applications from the area of view, first began a large-scale deployment of GPON in the area will be in North America, where there is a good basis for BPON, GPON from the ITU’s has a good and positive understanding of the second half of 2007 in Europe and Asia-Pacific region will also enter large-scale deployment phase, but not in size, and North America. Asia-Pacific region scale deployment by 2008 depends largely on Japan and South Korea before the deployment of EPON systems are successful, they will be like many agencies predicted a return to GPON, and after 2008, GPON deployment in the Asia-Pacific scale will depend largely on China and India, the deployment of emerging markets such as the size.
3, GPON’s cost projections
0LT the cost will be under the control of the ONU OLT to be shared equally, from the current actual deployment of PON systems point of view, each OLTPON the average number of export control ONT is not more than 23, therefore, reduce the cost of OLT and ONT are equally important. Costing in the PON, the general use of equal shares to each ONU (F
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