Comprehensive Comparison Between Wireless Access Network Technology and MMDS Access Technology

The wireless access network technology is quite common. So I studied the comprehensive comparison between the Wireless Access Network Technology and the MMDS access technology. I would like to share it with you here and hope it will be useful to you. An important factor in whether APON can be widely used is the price issue. At present, the first generation of actual APON products have limited service supply capability and high costs. The market prospect of the first generation is uncertain due to the global failure of ATM, but its technological advantages are obvious.

In particular, considering the operation and maintenance costs, the PON system is deployed in highly competitive regions in new regions or regions that need to replace the old copper system, or FTTB is a far-sighted choice. Whether or not the price-performance ratio can be improved to an acceptable level in the market in the next few years is the key to the survival and development of APON technology. Compared with other access technologies, such as copper twisted pair wires, coaxial cables, cat-5e cables, and wireless cables, the optical fiber access technology has a great available bandwidth and has great potential for development, in this regard, wireless access network technology cannot be compared. The optical fiber access network also features good transmission quality, long transmission distance, strong anti-interference ability, high network reliability, and saving pipeline resources. In addition, SDH and APON devices have a high degree of standardization, which helps reduce production and operation and maintenance costs.

Of course, compared with other access technologies, fiber-optic access networks also have some disadvantages. The biggest problem is the high cost. In particular, the closer the Optical Node is to the user, the higher the access device cost shared by each user. In addition, compared with the wireless access network technology, fiber-optic access networks also require pipeline resources. This is why many emerging carriers are optimistic about fiber access technology, but have to choose wireless access technology.

According to the position of the optical network unit, the optical fiber access method can be divided into the following types: FTTR optical fiber to the remote contact); FTTB optical fiber to the building); FTTC optical fiber to the roadside); FTTZ optical fiber to the residential area ); FTTH optical fiber to the user ). Optical Network units provide functions such as optical/electrical conversion, user information separation and re-connection, as well as feeding and signaling conversion to user terminals. When the user terminal is a analog terminal, a digital-to-analog converter and a digital-to-analog converter are available between the optical network unit and the user terminal.

Broadband Wireless Access Network Technology

With the development of telecom technology and the rapid popularization of the Internet, the communication business volume, especially the data communication volume, has greatly increased. The bandwidth of the backbone network is relatively adequate due to the large amount of usage of optical potential, and the main bottle diameter that limits bandwidth needs is in the access segment. Optical access network is a long-term solution for broadband access development. However, this method still has the disadvantages of High Engineering Cost and slow construction speed. For some network operators, local network resources are not available. In this case, to enter and occupy the access market, using the broadband wireless access network technology is a more appropriate entry point. Currently, there are four types of broadband wireless access network technologies: MMDS, LMDS, satellite communication access technology, and invisible Optical Fiber wireless systems.

MMDS Access Technology

MMDS (Multichannel Microwave Distribution System) Multi-Channel Microwave Distribution System has become an important part of the cable TV System. MMDS is designed to transmit TV programs, and the simulation of MMDS can only transmit 8 sets of programs, with the emergence of digital image/sound technology and social needs for high-speed data, analog MMDS is transitioning to digital MMDS. Thanks to 31 frequency points, digital MMDS in the United States can deliver hundreds of television programs and sound broadcast programs compressed by MPEG-2. It can also add one-way or two-way high-speed Internet services.

The MMDS frequency is 2.5 ~ 2.7 MHz. Its advantages are: rain attenuation is negligible; devices are mature; equipment costs are low. Its bandwidth is limited and only 200 MHz is insufficient. Many communication companies use LMDS Technology as a two-way wireless access network technology for data, voice and video. However, since the cost of MMDS is much lower than that of LMDS, and the technology is more mature, communication companies are willing to start with MMDS. They are using digital MMDS to carry out wireless bi- data services, primarily bidirectional wireless high-speed Internet services.

Recently, the digital MMDS system has been successfully built and put into use in some major cities in China. It not only transmits multiple TV programs, but also transmits high-speed data, which has become a pioneer in China's digital MMDS applications. Digital MMDS should not simply transfer more TV programs, but should give full play to the functions of the digital system, while transmitting high-speed data and carrying out value-added services. High-speed data services can promote regional economic development and bring greater economic benefits to MMDS operators. Because the income of data business is much higher than that of TV business.