The limitations of traditional access methods
ADSL and five lines is the two traditional access network. Overall, the technical limitations of these two traditional access methods can not be future-oriented. ADSL is a transitional broadband access technology developed based on the existing copper network of the telecom operators. uplink and downlink bandwidth of ADSL is asymmetry, downstream bandwidth in the range of 2 km, could only amount to 2 trillion, and there is a sharp decline with the increase of transmission distance, unable to meet the needs of high bandwidth and long distance information transmission. ADSL technology uses the bandwidth of copper wire, thus channeling between the electrical signals around the problem seriously affect the ADSL outlet rate (currently only reach 20%), that is to say, when more than 20% of users want to use bandwidth ADSL will be difficult to meet.
Five-line access mode is a simple LAN networking. It need to continue per 100 m, so it necessary to set the switch node and each floor in each storied building units, the network security, stability, reliability is difficult to be guaranteed. Network nodes, a direct result of high maintenance costs, poor operability to the system. Five lines network is difficult to become the operator of carrier-grade access network building programs, can not ultimately meet future transmission of high bandwidth and high reliability of the streaming media business. From the demand point of view, the business needs are expanding as digital TV, video on demand (VOD), IPTV, video phone, the 3-D interactive online games, distance education, telemedicine, remote monitoring, community and family intelligent management’s further development and promotion, and other streaming media business users more inclined to higher and more stable and reliable connection speed, it is necessary to use the new access network technology, and gradually replace the existing copper access.
Ultra-High Bandwidth: fiber itself has infinite bandwidth resources. FTTH will be extended to the backbone network bandwidth to the last mile, solving a copper wire transmission bandwidth bottlenecks (FTTH bandwidth is 100 times of the actual bandwidth such as ADSL Internet) ,which can be meet the current and future business needs.
Full-service access: data, voice and cable TV image signal can be a smooth fiber transmission of FTTH service access capabilities, you can achieve the triple play of TV, Internet and telephone. One-time construction, be able to meet a variety of value-added services continue to load, saving investment, to avoid redundant construction.
Stable and reliable, effective operation: FTTH able to meet the need of long-distance transmission (50 km), a significant reduction in FTTH active devices and network nodes, with a single medium fiber offers a variety of business services, simplifying network structure, easy maintenance and management, and consumers would not accept fell off the network and other consequences caused by the network instability of bandwidth, bandwidth, security, strong manageability.
Safe radiation: FTTH using optical fiber as a delivery vector, do not have to worry about electromagnetic radiation to cause environment pollution and the confidentiality of the transmission, anti-lightning, and it is a green access.
Long life: the life cycle of the optical access network is more than 35 years, experts generally believe that the field of communications: the future of access networks will be dominated by the optical access network.
The open-access platform to protect the user option: FTTH access network mode, to establish a fair and open network platform, open to all operators, letting the end-users have a right to choose the provider, the quality of the service can be improved (see Figure 1). FTTH take a synchronous design and construction in the construction. To take equality, openness and sharing mode in the operations, and therefore fundamentally eliminate the operators’ duplicated investment in cabling in the residential district. to provide favorable conditions for the residential area weak pipeline’s unity planning, construction and management and the neat appearance of the community.
FTTH Access Network on G/EPON Technology
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