The technological development of optical networks provides a reliable basis for the transformation of operators at the technical level. The application of WDM and ASON in trunk networks solves the problem of large-capacity trunk scheduling; the multi-service technology of local networks provides operators with network-wide solutions.
The transformation of domestic operators includes many aspects, from the monopoly of the telecommunications to the multi-operator competition, from the traditional voice service to the broadband-based triple play, and the technology gradually transforms to the next generation network. To provide users with better network and services. Quality, service, and cost are some of the key words that operators pay special attention to. Building an economic, robust, and converged network is emerging in more and more fields. Broadband, packetization, convergence, intelligence, multi-service, openness, mobility, security, and manageability have become the direction pursued by operators.
From the perspective of optical network construction, various technologies are constantly updated, providing more choices for operators' network construction. Whether it is mobile network broadband or access network marginalization, it is both a pressure and a challenge for the basic transmission network.
1. Large-capacity trunk line network First of all, in terms of line technology, China's large-capacity WDM system has reached the international top level. Fiber-fired communication 160×10Gb/s DWDM system and ultra-long-range ULH system research results, distributed Raman amplification technology, nonlinear effect suppression technology, precise dispersion management technology, super forward error correction SFEC technology, dynamic gain equalization technology A series of key technologies such as NRZ, CS-RZ code, etc. have made breakthroughs. The Xi'an-Xining section of Telecom is the only one of the over 1000 km of non-electric relay projects in China. The equipment is stable and reliable. FiberHome Communications 80×40G represents the highest level of domestic WDM technology, with a single channel rate of 42.8G and a total capacity of 3.2Tb/s. The channel spacing is 100GHz, and the optical wavelength configuration conforms to ITU-T recommendations and national standards. The telecom project in Shanghai to Hangzhou has opened a practical 40G channel in 2005. The distributed Raman amplification technology, accurate dispersion compensation, and forward error correction technology have demonstrated the absolute charm of fiber technology.
From the point of view of node technology, China's 40G SDH successfully realized the 560km non-electrical regeneration error-free transmission of STM-256 optical transmission system on G.652 and G.655 optical fiber, and solved the dispersion and nonlinearity of the system. The key problem is that the system's large-capacity, high-speed backplane design ensures stable operation of the system. The system also demonstrates the absolute leading position of Fiberhome Communications in the SDH field. The development of ultra-large capacity ASON node equipment provides a technical basis for the networking of complex networks, and is particularly suitable for application in carrier backbone networks. FiberHome's FonsWeaver series ASON equipment adopts the industry-leading single-bit cross-matrix technology Bite-Slice, which is a completely hardware-based crossover technology. It has fast crossover time and strict non-blocking. It can realize large-capacity crossover through a small number of chips. Achieve 1.28 Tbit/s capacity technology.
China Telecom's provincial trunk data bandwidth is at least 20 times that of voice bandwidth. In recent years, the network annual compound growth rate is around 200%, Internet business continues to grow at a high speed of 80%, and trunk P2P flows to over 40%. The above data indicates the continuous demand of the network for trunk capacity.
2. The broadband-integrated local network is still the focus of the local optical transport network construction. However, the basic network is not a simple transmission, but a variety of new technologies are integrated to provide differentiated services for new services. .
The SDH-based multi-service delivery platform MSTP combines TDM, IP and ATM, and remains the operator's first choice. First, support for voice services is a must, whether it is fixed-line voice, PHS, or GSM/CDMA for mobile networks. With the development of the fixed network and the development of NGN, MSTP is required to provide services for accessing the media gateways AG and IAD. The demand for Ethernet is gradually increasing, and QOS is proposed in terms of end-to-end bandwidth guarantee and delay requirements. New needs. At the same time, the use of ATM core in 3G technology has created MSTP as the new darling of the transmission network, and has the technology choice for the transition to the next version.
The MSTP embedded with MPLS (Multi-Protocol Label Switching Technology) in Fiberhome Communications uses multiple protection schemes such as port protection, line protection, and node protection to optimize the processing of large customer access, NGN network, and 3G network, and provides high-reliability QoS guarantee. For example, EPL, EVPL, EPLan, and EVPLan can be provided in the network to provide end-to-end services for large customer access. RPR (Resilient Packet Ring) technology is a successful technology in the protection of Ethernet ring networks. However, the limitations of its application in the ring are not suitable for operators' variable network topology. The combination of the two complements each other and obtains the carrier's Recognition.
Metro transport networks need to be transformed to support the rapid development of IP-based services such as TriplePlay services, 3G services, and Ethernet services for business applications. An emerging T-MPLS technology will become a service bearer platform for converged networks, capable of supporting all types of services (such as Ethernet, IP/MPLS, FR, ATM, TDM, etc.), and can support both ordinary users (wired/wireless) and Business development of business users.
In a new network with a large local network, operators tend to adopt MSTP networking with smooth upgrade to ASON. Large-capacity cross-devices, multi-light directions, multi-service slots, and mature data service processing capabilities are favored.
3. Open access layer network With the continuous enrichment of optical cable resources of various operators, the optical network gradually extends to the edge of the access network, taking advantage of the long distance and high bandwidth of optical fiber transmission. In the access system of the large customer, the low-cost small-sized MSTP device gradually replaces the early simple PDH application. The application of the branch PDH remotely on the IBAS device can be used for service scheduling and unified network management. The edge MSTP requires the STM-1/4 networking capability to be provided upwards, and provides a rich service interface downwards, such as the commonly used E1 interface, Ethernet interface, V.35 interface, SHDSL interface, etc., and has centralized PDH function and The CWDM function can solve the problem of insufficient edge cable resources.
Broadband multi-service access combines the current leading ADSL access with multiple access methods, and the MSAN application allows operators to shine. MSAN provides service access based on ADSL, LAN, V5, and VOIP, and has H.248/MGCP protocol processing capability, which is well integrated into the NGN network.
Although ADSL still dominates broadband access, FTTH commercials started in 2005, such as a heat wave, which is rapidly spreading across the country. GEPON is the first commercial enterprise in more than 20 cities across the country. It is a residential building, a high-end residential area, and a commercial center. There is rural information technology to provide broadband service access. FiberHome Communications uses GEPON equipment to realize triple play, which combines voice, high-bandwidth data, IPTV/CATV, and adopts advanced multi-LLID for user network Qos. Its integrated solution has realized the dream of optical network for many years. .
The application of new technologies provides a reliable guarantee for the transformation of operators. Facing the tide of informationization and the trend of information services, building broadband optical networks and reducing operators' CAPEX and OPEX will bring sustained and stable benefits.
The transformation of domestic operators includes many aspects, from the monopoly of the telecommunications to the multi-operator competition, from the traditional voice service to the broadband-based triple play, and the technology gradually transforms to the next generation network. To provide users with better network and services. Quality, service, and cost are some of the key words that operators pay special attention to. Building an economic, robust, and converged network is emerging in more and more fields. Broadband, packetization, convergence, intelligence, multi-service, openness, mobility, security, and manageability have become the direction pursued by operators.
From the perspective of optical network construction, various technologies are constantly updated, providing more choices for operators' network construction. Whether it is mobile network broadband or access network marginalization, it is both a pressure and a challenge for the basic transmission network.
1. Large-capacity trunk line network First of all, in terms of line technology, China's large-capacity WDM system has reached the international top level. Fiber-fired communication 160×10Gb/s DWDM system and ultra-long-range ULH system research results, distributed Raman amplification technology, nonlinear effect suppression technology, precise dispersion management technology, super forward error correction SFEC technology, dynamic gain equalization technology A series of key technologies such as NRZ, CS-RZ code, etc. have made breakthroughs. The Xi'an-Xining section of Telecom is the only one of the over 1000 km of non-electric relay projects in China. The equipment is stable and reliable. FiberHome Communications 80×40G represents the highest level of domestic WDM technology, with a single channel rate of 42.8G and a total capacity of 3.2Tb/s. The channel spacing is 100GHz, and the optical wavelength configuration conforms to ITU-T recommendations and national standards. The telecom project in Shanghai to Hangzhou has opened a practical 40G channel in 2005. The distributed Raman amplification technology, accurate dispersion compensation, and forward error correction technology have demonstrated the absolute charm of fiber technology.
From the point of view of node technology, China's 40G SDH successfully realized the 560km non-electrical regeneration error-free transmission of STM-256 optical transmission system on G.652 and G.655 optical fiber, and solved the dispersion and nonlinearity of the system. The key problem is that the system's large-capacity, high-speed backplane design ensures stable operation of the system. The system also demonstrates the absolute leading position of Fiberhome Communications in the SDH field. The development of ultra-large capacity ASON node equipment provides a technical basis for the networking of complex networks, and is particularly suitable for application in carrier backbone networks. FiberHome's FonsWeaver series ASON equipment adopts the industry-leading single-bit cross-matrix technology Bite-Slice, which is a completely hardware-based crossover technology. It has fast crossover time and strict non-blocking. It can realize large-capacity crossover through a small number of chips. Achieve 1.28 Tbit/s capacity technology.
China Telecom's provincial trunk data bandwidth is at least 20 times that of voice bandwidth. In recent years, the network annual compound growth rate is around 200%, Internet business continues to grow at a high speed of 80%, and trunk P2P flows to over 40%. The above data indicates the continuous demand of the network for trunk capacity.
2. The broadband-integrated local network is still the focus of the local optical transport network construction. However, the basic network is not a simple transmission, but a variety of new technologies are integrated to provide differentiated services for new services. .
The SDH-based multi-service delivery platform MSTP combines TDM, IP and ATM, and remains the operator's first choice. First, support for voice services is a must, whether it is fixed-line voice, PHS, or GSM/CDMA for mobile networks. With the development of the fixed network and the development of NGN, MSTP is required to provide services for accessing the media gateways AG and IAD. The demand for Ethernet is gradually increasing, and QOS is proposed in terms of end-to-end bandwidth guarantee and delay requirements. New needs. At the same time, the use of ATM core in 3G technology has created MSTP as the new darling of the transmission network, and has the technology choice for the transition to the next version.
The MSTP embedded with MPLS (Multi-Protocol Label Switching Technology) in Fiberhome Communications uses multiple protection schemes such as port protection, line protection, and node protection to optimize the processing of large customer access, NGN network, and 3G network, and provides high-reliability QoS guarantee. For example, EPL, EVPL, EPLan, and EVPLan can be provided in the network to provide end-to-end services for large customer access. RPR (Resilient Packet Ring) technology is a successful technology in the protection of Ethernet ring networks. However, the limitations of its application in the ring are not suitable for operators' variable network topology. The combination of the two complements each other and obtains the carrier's Recognition.
Metro transport networks need to be transformed to support the rapid development of IP-based services such as TriplePlay services, 3G services, and Ethernet services for business applications. An emerging T-MPLS technology will become a service bearer platform for converged networks, capable of supporting all types of services (such as Ethernet, IP/MPLS, FR, ATM, TDM, etc.), and can support both ordinary users (wired/wireless) and Business development of business users.
In a new network with a large local network, operators tend to adopt MSTP networking with smooth upgrade to ASON. Large-capacity cross-devices, multi-light directions, multi-service slots, and mature data service processing capabilities are favored.
3. Open access layer network With the continuous enrichment of optical cable resources of various operators, the optical network gradually extends to the edge of the access network, taking advantage of the long distance and high bandwidth of optical fiber transmission. In the access system of the large customer, the low-cost small-sized MSTP device gradually replaces the early simple PDH application. The application of the branch PDH remotely on the IBAS device can be used for service scheduling and unified network management. The edge MSTP requires the STM-1/4 networking capability to be provided upwards, and provides a rich service interface downwards, such as the commonly used E1 interface, Ethernet interface, V.35 interface, SHDSL interface, etc., and has centralized PDH function and The CWDM function can solve the problem of insufficient edge cable resources.
Broadband multi-service access combines the current leading ADSL access with multiple access methods, and the MSAN application allows operators to shine. MSAN provides service access based on ADSL, LAN, V5, and VOIP, and has H.248/MGCP protocol processing capability, which is well integrated into the NGN network.
Although ADSL still dominates broadband access, FTTH commercials started in 2005, such as a heat wave, which is rapidly spreading across the country. GEPON is the first commercial enterprise in more than 20 cities across the country. It is a residential building, a high-end residential area, and a commercial center. There is rural information technology to provide broadband service access. FiberHome Communications uses GEPON equipment to realize triple play, which combines voice, high-bandwidth data, IPTV/CATV, and adopts advanced multi-LLID for user network Qos. Its integrated solution has realized the dream of optical network for many years. .
The application of new technologies provides a reliable guarantee for the transformation of operators. Facing the tide of informationization and the trend of information services, building broadband optical networks and reducing operators' CAPEX and OPEX will bring sustained and stable benefits.
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