At present, in terms of optical fiber access network technology, narrowband access is gradually being replaced by broadband access, and eventually fiber home is achieved. The broadband optical fiber of the access network becomes inevitable, and PON technology will become the technical hotspot of the broadband access network in the future because of its multi-service, low investment and easy maintenance.
What is a fiber access network?
The optical fiber access network refers to an access network in which the transmission medium is an optical fiber. Optical fiber access networks can be technically divided into two categories: active optical networks (AON, Active Optical Network) and passive optical networks (PON, Passive Optical Network).
Active optical network can be divided into AON based on SDH and AON based on PDH;
Passive optical networks can be divided into narrowband PON and broadband PON.
What role does the access network play in network construction?
The information network is composed of a core backbone network, a metropolitan area network, an access network, and a customer premises network. The access network is on the bridge of the metropolitan area network / backbone network.
At present, science and technology are advancing by leaps and bounds, and a large number of electronic files are constantly being produced. With the economic globalization and the acceleration of social informatization, the Internet has been widely popularized, data services have grown violently, and the types of telecommunications services have continued to expand. Kind of business. The narrowband access network has become a bottleneck restricting the development of the network to broadband. The access network market has a large capacity, and new technologies are constantly emerging to meet the needs of users. The access network is the focus and key to the development of national information infrastructure. Network access technology has become the focus and investment hotspot of research institutions, communication vendors, telecommunications companies and operating departments.
Advantages of PON
1. Can provide transparent broadband and low-cost transmission capabilities.
2. Compared with the active optical network, its installation, commissioning and maintenance operation costs are low, and the system is more reliable and stable, so the access network is applying a large number of PON systems.
3. Because PON adopts the point-to-multipoint access mode, the infrastructure cost of laying optical fiber between the central office and users is borne by the users, which can increase the return on investment in network construction. Compared with the method of configuring end-to-end optical fiber for each user, the volume of PON equipment that improves services for the same number of customers is smaller and takes up less space in the central office.
4. PON supports both traditional services (traditional telephone service POTS, analog TV) and broadband services (IP voice transmission, IPTV, broadband Internet access, etc.).
5.PON supports all residential users (using POTS, analog TV and data services) and many commercial users (using T1 / E1 and Ethernet services) to share an access network (including the physical layer and protocol layer) without having to use different access Access to the network provides services for them, thus reducing the number of scattered access networks.