China Telecom announced that "the last TDM program-controlled switching end office will be powered off," and "the ROADM network in the middle and lower reaches of the Yangtze River" was officially put into use. China Telecom has become the world's largest all-optical network, leading China to a new era of all-optical high-speed.
“Agree to power off!†On December 21, 2017, with the order of the scene, China Telecom’s last TDM program-controlled switching end office was powered off, marking China Telecom as the world’s largest all-optical network and all-IP network. The operator has opened a new era of China's all-optical high-speed. Li Xiangning, deputy director of the Communication Administration Bureau of the Ministry of Industry and Information, Wei Leping, executive deputy director of the Science and Technology Committee of the Ministry of Industry and Information Technology, Chen Quzhong, director of the Shanghai Communications Administration, Sun Xiaohong, general manager of the China Telecom Network Operation and Maintenance Division, and Ma Yimin, general manager of China Telecom Shanghai Corporation, and other guests Attend the ceremony of retiring the TDM program-controlled switching equipment.
"TDM program-controlled switches are a microcosm of the rapid development of the communications industry. The last exchange point in our network has a milestone significance." Sun Xiaohong said. The overall decommissioning of TDM switches marks that China Telecom has completed a large leap from circuit switching to full IP switching, accelerating the intelligent reconfiguration of networks, and opening a new journey for all-optical network operations.
The TDM switch is an instant-division multiplexing mode, also known as a program-controlled telephone switch, which uses time division multiplexing technology and large-scale integrated circuits. Time division multiplexing is a digital multiplexing technique, which refers to a technique of transmitting a plurality of digitized data, voice and video signals on the same communication medium through cross-bit pulses in different channels or time slots. The telephone network is based on TDM technology, so its network or device is often referred to as a TDM network or device. The services provided by the TDM equipment include basic voice services, namely, call service, call transfer, caller ID and other supplementary services, and provide intelligent services such as 400 and 800 together with the intelligent network.
At the beginning of the reform and opening up, the national public telephone network capacity was only 4.35 million, and the telephone users were only 2.14 million. The telephone penetration rate was only 0.38%, less than one tenth of the world average. In the application of telephone switching technology, China Telecom broke the international practice and boldly introduced and promoted the use of program-controlled switches using TDM technology that was just commercialized at the time.
On December 24, 1980, the Fujian Post and Telecommunications Administration and Japan's Fujitsu Co., Ltd. officially signed the introduction of the "F150 Program-controlled Telephone Switch Contract" to introduce 10,000 door exchanges and 600 lines for long-distance exchange for the Fuzhou Telecom Bureau. On November 27, 1982, China's first program-controlled telephone exchange F150 was launched in Fuzhou. China Communications has embarked on a journey of high starting point and big leap. Communication construction continuously meets the needs of national economic and social development. The scale network capacity, technology level and service level of the communication network have entered the world's advanced ranks. The telecom industry has changed from the "bottleneck" of national economic development in the early stage of reform and opening up to support economic development and industrial upgrading. engine".
More than 30 years ago, the TDM program-controlled switch was the most advanced communication device in the world at that time. However, with the rapid development of the communication industry technology, IMS and softswitch equipment based on IP technology have matured and deployed on the scale of the network, with the replacement of TDM switching equipment. ability. At the same time, a large number of TDM switches have been running on the network for more than 20 years, and the equipment aging failure rate is high, and it is impossible to provide users with multimedia services such as video calls. In addition, TDM switches consume a lot of energy and are not in line with the green development concept.
TDM retreat
At the ceremony, China Telecom adopted the latest cloud-based (VoLTE) network for remote control, and the whole process of powering off the network by TDM program-controlled switching equipment through HD video. According to reports, China Telecom is promoting the simplified optimization of the network architecture, and the basic voice services will all be carried by the IMS network, which is also the world's most advanced core network standard architecture.
In 2016, China Telecom released the CTNET2025 network architecture white paper, fully launched the network intelligent reconfiguration, introduced the world's leading SDN/NFV technology, and built through the basic cloud resource layer, software network function layer and collaborative orchestration layer architecture. A new network that is simple, agile, open, and intensive. China Telecom's network reconfiguration is expected to be fully completed by 2025. Through intelligent reconfiguration, the next-generation network will be able to achieve the following goals: one is to greatly enhance network capabilities and performance, and create a powerful next-generation information infrastructure; the second is to promote cost reduction and efficiency through business and technological innovation. Fees, benefiting the country and the people; the third is to create an open new ecology, support the "double innovation" new engine, provide users with a wealth of network business; Fourth, technology innovation leads, support the Chinese enterprises to "go global."
In order to further improve the network capabilities, meet the needs of users in the intelligent era, and promote energy conservation and emission reduction, China Telecom accelerated the upgrade of the communication infrastructure network. In 2014, it launched a large-scale user-side office retreat. After 4 years, 4,575 end offices were completed. The program-controlled switch exits and migrates 110 million users. This is also the world's largest TDM switching network user migration, which is a pioneering work in the history of the communications industry.
The overall decommissioning of program-controlled switches is also an important measure for China Telecom to fulfill its social responsibilities, actively eliminate backward production capacity, vigorously promote energy conservation and emission reduction, and achieve green development. It is estimated that the TDM program-controlled switching equipment has a total power saving of 1.682 billion kWh in the past four years, equivalent to 1.377 billion kilograms of carbon dioxide emission reduction.
Open a new era of all-optical high-speedOn December 14, China Telecom's “ROADMED Network in the Middle and Lower Reaches of the Yangtze River†was officially put into use. This is the first commercial ROADM network in the Chinese market. The network scale and technology level are among the highest in the world, marking China Telecom's move to the all-optical network. A big step has been taken. The ROADM network realizes rapid service delivery, automatic scheduling and recovery of the transmission network at the optical level. It has the ability to resist multiple “broken fiber†recovery, which makes the optical network evolve from the traditional non-networked point-to-point link to optical networking. A major technological change in the field of transmission.
China Telecom users have also upgraded from traditional copper access to fiber access, enabling a fiber-optic home, while enjoying services such as voice, high-speed broadband, and IPTV HDTV. All-optical network and all-IP networking operations also lay the foundation for promoting new applications in the intelligent era such as Gigabit broadband, 4k HD video and Internet of Things.
Since 2011, China Telecom has continued to promote the construction of “Broadband Chinaâ€. Up to now, it has built the world's largest fiber-optic broadband network, 312 million optical fiber-to-the-home (FTTH) optical ports, serving 150 million broadband users, and the overall network scale and users. Several rank first in the industry.
The "network power" strategy puts forward new requirements for the development of the information and communication industry, and also gives China Telecom a new mission in the new era. China Telecom said that it will meet the people's longing for a better life, continue to promote the network reconstruction CTNET2025, and build a world-leading mobile, broadband, Internet of Things, land, sea and air integration boutique network to achieve high-speed, integrated, secure cloud Network and business services; promote digital economy and social development, let consumers enjoy the new life of intelligent information.
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