Gpon Technology In The Chinese Carrier Market Application
Article by jekky
GPON technology is based on the ITU-TG.984.x standard integrated the latest generation of broadband passive optical access standard, high-bandwidth, high efficiency and large coverage, rich user interface and many other advantages, by most operators seen as the broadband access network business, integrated technology transformation of the ideal. In this paper, the application of practical technology products GPON, GPON technology proposed in the Chinese market, the basic application mode. 1, GPON Technology of PON technology originated in 1995 ATMPON evolving technical standards, PON is the English \ “Passive Optical Network \” acronym. And GPON (Gigabit-CapablePON) first organized by the FSAN made in September 2002, ITU-T on this basis in March 2003 completed the ITU-T G.984.1 and G.984.2 for the development, in February 2004 and June completed the standardization of G.984.3. Ultimately formed a family of GPON standards. GPON technology equipment based on the basic structure and the existing PON similar, but also by the central office of the OLT (optical line terminal), the client’s ONT / ONU (optical network terminal or a called optical network unit), before connecting two kinds of equipment from single-mode fiber (SM fiber) and passive splitter (Splitter) consisting of ODN (Optical Distribution Network) and the network management system components. Basic structure shown in Figure 1. Figure 1 GPON equipment, the basic network structure Compared with other PON standards, GPON standard provides an unprecedented high bandwidth, downlink rates of up to 2.5Gbit / s, the non-symmetrical features can adapt to the broadband data services market. QoS guarantee to provide full service, while carrying ATM cell and (or) GEM frame, have a good level of provision of services to support the QoS guarantee and full service access capabilities. Bearing GEM frame, TDM services can be mapped to the GEM frame, using the standard 8kHz (125 s) to directly support the TDM frame business. As a carrier-grade technology standards, GPON also provides the access network level protection mechanisms and the integrity of the OAM functions. As the ITU-T proposed a flexible broadband access technology, it is compared with the existing PON systems very different from the PON technology. In the GPON standard, clearly defined type of business in need of support, including data services (Ethernet services, including IP services and MPEG video streams), PSTN service (POTS, ISDN services), dedicated lines (T1, E1, DS3, E3, and ATM services) and video (digital video). GPON Multi-service mapped to ATM cell or GEM frames to transmit, for various business types can provide the appropriate QoS. GPON technology enables operators should be based on their market potential and regulatory environment specific, targeted delivery of its customers need to provide specific services. Present, GPON technology, equipment is relatively complex. GPON QoS guarantees carrying a multi-service OAM capability and strong technical advantage is to a large extent, the complexity and cost of equipment, in return, making the higher cost of related equipment. With GPON technology development and large-scale application, GPON equipment costs will decrease accordingly. 2, based on GPON technology products Is developing products based on GPON technology more manufacturers, including major domestic telecom equipment manufacturers, but due to high technical threshold, there is no corresponding supporting GPON ASIC vendor, only their own development of the various manufacturers their GPON chip, so the industry is not mature commercial products over GPON. FlexLight Network Co., Ltd. is an Israeli company specializing in the development of GPON systems, they are now all over Europe and the United States carriers to provide the access network based on GPON technology systems. They are also the only company in China to provide Chinese operators have commercial GPON systems manufacturers. FlexLight’s Optimate GPON system to hold GEM frame, for operators to provide high quality TDM and data services, based on C / S full graphical interface for the user’s access network to provide ease of administration. 3, the current GPON products, market positioning and application of models GPON technology is a broadband optical access technology, positioning their products must be access network. Industry with a popular jargon, GPON is a realization of FTTx technologies. As a new technology, the network structure of the access network, GPON in the end what should play a role? Access network is a network-level concept, which is located the end of the entire communications network, telecommunications network that is closest to the business end-user access layer. The optical fiber access network can own network users, business type and other factors, broken down into the trunk layer, wiring layer and the lead layer three-tier structure. GPON equipment market position and the operator is actually present in the access network level, the specific process of the optical fiber. Currently, operators in the access layer of optical fibers are the same basic strategy, from the feeder section of the access network level, wiring section lead to the final paragraph of paragraph by paragraph, the progressive realization of optical fiber, the ultimate goal of the FTTH (fiber to the home ). Currently, operators have basically all the feeder section and most of the wiring section of the fiber-optic technology, while the lead paragraph of the fiber of the pace of the process seems relatively heavy and slow. This among many reasons, mainly due to the following points: (1) major operator customers rich copper resources, assets, heavy precipitation, use of copper wire carrying the current broadband access technologies (xDSL) equipment and technical specifications mature, low cost, the current bandwidth to meet the vast majority of home users and small and medium enterprises as part of the application requirements, and also to further expand its bandwidth capacity (currently mature VDSL technology has practical applications can access rate up to 10M and above); (2) supporting the engineering and technical specifications mature, supporting the construction of technically complex and costly; (3) There is no real need for home users, based on high-bandwidth data applications, FTTH high bandwidth to use them; (4) the cost of the device itself is relatively high, limiting the promotion of FTTH technology. As a dedicated access network technology, GPON FTTH is the best technology to achieve. The technical specifications required to achieve the ultimate goal is for all end-user access. To this end, the specification provides a series of family-oriented end user interface, such as ordinary audio

