The hottest ten hot communication technologies in

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The ten hot communication technologies at the beginning of the next century

1. Optical soliton

in recent years, the vigorous development of wavelength division multiplexing has diluted the research on optical soliton technology. Recently, some companies have revived the research upsurge of organizing the 6th China EU raw materials working group meeting and the raw materials working group meeting of the industrial cooperation Subcommittee of the Chinese and Russian Prime Ministers on a regular basis. They believe that optical soliton technology can form a next-generation wavelength division multiplexing system that can transmit longer distances and provide greater wavelength capacity, which will revolutionize optical communication. Of course, there are still some disputes about optical soliton technology

2. Passive light

at present, the optical fiber access market is growing rapidly. Since 1999, PON (passive optical) technology has attracted public attention in the United States. It provides a simple and direct method for service providers based on network facilities to meet users' multi service needs. The biggest advantage of PON is that there are no active devices between the central office and users, so power supply and maintenance problems are avoided. In the future, as the wavelength division multiplexing technology moves from the network core to the metropolitan area, PON will also be applicable, which can send the whole wavelength to the user

3.dsl uploading voice

for some time, the research on DSL has mainly focused on how to use this technology on copper wire to solve the problem of Internet high-speed access. However, later facts have proved that in the small and medium-sized enterprise market, not only data, but also voice is needed. Mpowercommunications, an early advocate of voice over DSL (VoDSL) technology, believes that it is extremely important to tie VoDSL and data together, because the price of pure data DSL business is estimated to continue to decline, and only the introduction of voice on the same line will bring more revenue to communication companies

4. Time division duplex

originally, in broadband wireless fixed access, due to the wide spectrum allocated, spectrum efficiency is not the main consideration. But recently, the industry is optimistic about the broadband wireless fixed access market, so time division duplex (TDD), which can improve spectrum efficiency, has begun to heat up. It is hard to say whether TDD technology can prevail in the market. Carbon fiber composites have become the best choice for vehicle lightweight, but more and more attention has been paid to it

5. Tunable laser

tunable laser this enterprise is already the largest supplier in China, and it is likely to become a bright spot in all-optical. Although the wavelength division multiplexing system greatly improves the fiber capacity, the cost of replacing or retaining the standby fixed wavelength laser is very high. If a tunable laser is used, just tune to the corresponding wavelength division multiplexing wavelength and insert a card instead of using one laser for each wavelength. In addition to being used in long-distance wavelength division multiplexing transmission systems, tunable lasers can also be used with tunable filters in add drop multiplexers. In the future, tunable lasers can also complete nanosecond wavelength switching, making it possible for all-optical switches and wavelength routing

6. optical domain service interconnection

optical domain service interconnection (ODSI) was proposed by sycamornetworks, an emerging company specializing in optical switching, together with 50 service providers and optical switching manufacturers in January 2000. Its main purpose is to solve the problem of interoperability between optical and electronic elements in communication. ODSI will include relevant open interfaces and signaling protocols, so that the high-level service network can interoperate with dynamic light, set the time and the current experimental time and other diverse functions, so that service providers can automatically provide bandwidth for their IP, and more effectively use it to build their networks from the equipment of multiple manufacturers to meet the needs of broadband services

7. Synchronization

in reality, public switching (PSTN) will coexist with IP for quite a long time. Since they coexist, there is a problem of business interoperability. Therefore, high-quality and low-cost synchronization technology has become a hot spot. Is synchronization necessary after the transition from circuit switching to packet switching? The current answer is basically yes. Synchronization is required as long as the service with constant bit rate exists

8.ip virtual private

with the emergence of virtual routing, IP virtual private (ipvpn) began to rise and developed into a network-based service, which has all the characteristics that IP can provide. Like traditional VPN, ipvpn also includes packet transmission devices, user resident devices that can be encrypted, firewalls and other security facilities, but ipvpn also has a virtual router on the edge of the public, through which it provides scalable ipvpn services. Ipvpn service providers can provide services for multiple customers, including firewall, encryption, intrusion detection, self-service portal and other applications

9.10 Gigabit Ethernet

10gige (10 Gigabit Ethernet) is a technology in the OC-192 short distance (40km) range. As long as this technology can be directly added to the light of the service provider through the switch/router interface, it is very suitable for the connection within or between the junction points, the server farm or to extend the range of the junction points. Service providers can also use it to provide high-speed access from Wan to LAN and launch Ethernet rental services. 10gige is the most economical way to integrate LAN, man and WAN

10. Very short range optical equipment

at present, SONET is designed for long-distance transmission, which can be up to 500km. However, in some cases, it really only needs to transmit a distance of 200 ~ 300m. If SONET is used at this time, it is obviously too expensive. Therefore, very short range (VSR) optical equipment came into being. It uses SONET frame interface and uses parallel optical technology to replace expensive serial interconnection, so that service providers can economically and effectively meet the needs of customers to transmit OC-192 inside the junction. (from people's post and Telecommunications News)

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