Category 5 Broadband Wireless Access Network Devices

The Application of broadband wireless access networks is gradually popularized. Do you know which broadband wireless access network devices are available? This article will detail the types of broadband wireless access network devices. We hope that you will have a comprehensive understanding of this.

There are three standards in the world for Broadband Wireless Access Networks: IEEE Standard, ATM Forum standard, and European ETSI standard. The European ETSI Broadband Wireless Access Network Team has studied and investigated the use of wireless access networks, it is concluded that the data transmission rates vary depending on different purposes. For example, on-demand TV demand requires 1.5 Mbit/s to 6 Mbit/s, and on-site browsing requires 2 Mbit/s, 10 Mbit/s and 25 Mbit/s for LAN interconnection. Therefore, there are currently roughly five types of broadband access network devices ｡

Broadband Wireless Access Network Equipment category 1:

It is a device that provides 2 Mbit/s rate, such as Ericsson's Airline system. Microwave Single-point multi-access system can also provide 2 Mbit/s rate ｡

Broadband Wireless Access Network Devices:

Uses the local Multi-Point Distribution System LMDS. LMDS was first developed by Cellularvisim, many companies, such as Ericsson, Nortel Networks, Alcatel, Bosch, Lucent, Hewlett-Packard, and Hughes, provide LMDS. The LMDS system consists of base stations, user devices, and network management systems. and the user end are both composed of outdoor units (microwave transceiver and antenna) it is composed of an indoor unit (modem) that is connected through an air interface. LMDS operates in a single-point multiplexing mode, similar to microwave one-point multiplexing, but different from traditional microwave one-point multiplexing, LMDS can work in the form of a cellular network ｡

The operating frequency of LMDS is 24 GHz, 28 GHz, 31 GHz, 38 GHz, and 40 GHz. In the United States, the frequency of LMDS is 27.5GHz ~ 28.35GHz and 29.1GHz ~ 29.5 GHz; in Europe, LMDS is in the trial of GHz ~ 42.5GHz. LMDS does not support mobile services and supports fixed voice, data, image services, ATM, TCP/IP, MPEG2, and other standards, the access speed can reach N × 64kbit/s to 2 Mbit/s, or even up to 155 Mbit/s, and the bandwidth in the working band must be at least MHz. LMDS is a new technology, the Application of LMDS in Internet and high-speed data communication should be paid attention to by people in the industry ｡

Broadband Wireless Access Network Device Category 3:

It is a wireless LAN and wireless ATM. WLAN and wireless ATM have two standards, namely, the IEEE Standard and the wireless ATM Forum standard. In, a wireless ATM (WirelessATM) was proposed at ITU (99vU) concept. In June 1996, the ATM Forum (ATM Forum) formally established a wireless ATM working group responsible for the standardization of wireless ATM and system planning) the research has been carried out in Europe and the United States. Germany, Sweden, Italy and other European countries have invested heavily. The German National Information Research Center has proposed a scheme, it aims to overlay TCP/IP on the wireless ATM layer to provide Wired/wireless broadband Internet services, and has achieved research results. The United States has also proposed a wireless ATM experiment scheme. Wireless ATM is a new broadband wireless technology, its basic technology is wireless access and Mobile ATM. Currently, wireless access networks using wireless ATM have not yet been seen, but the development trend is gratifying ｡

Broadband Wireless Access Network Devices Category 4:

It is a standard formulated by ETSI of the European Telecommunications Standards Association. ETSI proposed the first hipera1standard in 1992. Currently, ETSI has announced new standards according to the ACTS plan, the new standard provides an access rate of over 25 Mbit/s, including multiple broadband wireless access projects. The access rate varies with the operating frequency, the speed can reach 155 Mbit/s at 60 GHz ｡

Category 5 broadband wireless access network devices:

Optical Wireless Communication is a new concept. In our mind, only optical wired communication (optical fiber communication) is used ), optical Fiber Communication transmits infrared signals in optical fiber. Infrared signals can be transmitted in Wired (optical fiber), so they can also be transmitted in Wireless (atmospheric) environments, propagation in the atmosphere becomes the OpticalWirelesscommunication, the infrared light source (light emitting tube and laser tube) in optical fiber communication) it can also be used for optical wireless communication. The photoelectric detection tube for Optical Wireless Communication receivers can be PIN or APD. The optical wireless system can be used for point-to-point communication, and can also form an optical wireless LAN (OWLAN) the optical wireless system has carried out multiple tests abroad, including the test with a transmission distance of 40 meters and a data transmission rate of 1 Gbit/s, broadband Wireless Access will add a new one ｡