Gpon is the best way to transition to full ip/ethernet network

There have been many reports of IP voice transmission (VoIP), network TV (IPTV) and video-on-demand on the Internet, as well as reports of other businesses being or are about to be launched by Network service providers. There has been little debate about the market demand for these services or the possibility of providing these services. The growing clout of emerging broadband carriers like Vonage has illustrated early market demand and market acceptance for these businesses.

Recently some large operators have begun to tentatively launch video and television services on IP networks. Business operators want to increase revenue and profits through these new businesses and reduce customer churn.

Although the era of ip-based business and all-IP networks is coming, there are still questions about which network, especially the access infrastructure, is most appropriate. XDSL, passive optical Network (PON) and end-to-end optical networks all have their own supporters and opponents. In this paper, the characteristics of different pon are discussed, and the comparison shows that only the gigabit passive optical Network (GPON) can provide the path of the network evolution and the bandwidth needed to transfer the new business in the current market technology.

Advantages of PON structure

Compared with the traditional network structure, PON has the following advantages:

Since PON is called passive, it does not require the installation of traditional active devices between central bureaus and user stations. These active devices typically require a power drive, which can result in more initial construction costs (i.e. more network construction fees, capex) and additional outdoor maintenance costs (i.e. more network operating maintenance fees, OPEX).

Pon often also means sharing costs with multiple users. The infrastructure cost of laying optical fiber between the Central Bureau and the users is shared by the users, which can improve the return of investment in network construction. The security and bandwidth sharing mechanism inherent in the PON protocol can ensure the safety and transparency of the user's shared line.

At the Central Bureau, a high-speed fibre interface can serve multiple users at the same time, delivering fibre based business for them. As a result, the PON device that provides business for the same number of customers is smaller and occupies less space in the Central Bureau compared to the method of configuring End-to-end fiber for each user.

Pon also supports traditional services (common legacy telephony (POTS), Analog TV) and broadband services (IP voice transmission, IP digital TV, network TV, etc.).

PON supports all residential users (using POTS, analog TV and data Services) and many business users (using T1/E1 and Ethernet services) share a single access network (including physical and protocol layers) without having to service them separately using different access networks, thus reducing the number of decentralized access networks.

These advantages of PON have enabled it to be used as a major technology in access networks in the past three years, mainly in Asia and the United States, especially in Japan's NTT and local bell operators (RBOC).

Various PON

Although PON technology has emerged in the the mid 1890s, its standards have only matured in recent years and have been commercially available.

The initial criteria were developed for Apon (also known as Bpon), which is characterized by the adoption of an ATM architecture approved by the International Telecommunication Union (ITU) in the mid 1890s. Apon uses ATM encapsulation to deliver voice and data, and all businesses use ATM for transmission via PON.

In recent years, IEEE has introduced a standard based on Ethernet technology, which is usually called epon. All of the business in Epon is routed over Ethernet.

The latest standard is Gpon, also approved by the ITU. Gpon directly supports the transmission of Time Division Multiplexing (TDM) and Ethernet services in the original format or through an ATM package, while also providing bandwidth support to the next generation of business that the business operators are offering.