Unitrans ZXSM-10G SDH transmission system
Unitrans ZXSM-10G is a S-64 / OC-192 level multi-functional broadband node device launched by ZTE. It can provide high-speed and large-capacity information transmission to meet the needs of current and future trunk network, local network and metropolitan area network. Unitrans ZXSM-10G and Unitrans ZXWM-32 40 × 10G DWDM can provide up to 400G bandwidth to meet the bandwidth requirements of network development. It is an ideal device for building broadband transmission networks.
Unitrans ZXSM-10G system adopts advanced technology and design ideas, inherits ZTE's technology accumulation in the field of SDH, and combines the diversification of network services and changes in network structure to give SDH equipment a new technical connotation: Unitrans ZXSM-10G system is a It is a new type of node equipment integrating ADM, DXC, IP / A and DWDM.
1. Broadband service transmission capability
Two compatible designs
Unitrans ZXSM-10G is compatible with ETSI and ANSI multiplexing mapping structures, and adopts the multiplexing mapping structure (ETSI) of VC-4 to AU-4 subset in ITU-T G.709 or VC-3 to AU-3 sub Set multiplexing mapping structure (ANSI), compatible with SDH and SONET standards.
Powerful cross-connect capability
Unitrans ZXSM-10G system single subrack can provide 512 × 512 equivalent VC-4 crossover capability. For the cross-connect board, the various service interfaces are equivalent, so non-blocking full cross-connection of services between different interfaces can be achieved. The granularity of the cross-connection is VC-4 or AU-3, STS-1. The large-capacity cross-connect matrix makes Unitrans ZXSM-10G have strong business scheduling and bandwidth management capabilities, and has the function of digital cross-connect equipment DXC.
Large-capacity service access capability
Unitrans ZXSM-10G system provides rich service interfaces: S-64, S-16, S-4, S-1 optical interfaces and S-1, E4 electrical interfaces, GE, 10M / 100M Ethernet, and can provide high integration Service interface board to meet the needs of large-capacity service access.
Second, multi-service support capabilities
With the development of network service data, the types of services are also diversified. Traditional SDH equipment only provides a way to multiplex and map various PDH level signals or other signals into the SN frame structure, which makes the application of the equipment lack flexibility. The Unitrans ZXSM-10G system supports AU-level cascading applications, and can transmit non-PDH standard-level signals through the cascading application method, enabling the system to adapt to a wider range of service rates, satisfying the transmission of IP, A and other data services and introducing new services Demand.
IP OVER SDH / Ethernet OVER SDH function
Unitrans ZXSM-10G system adopts IP OVER SDH / Ethernet OVER SDH technology, can provide 10M / 100M Ethernet, GE interface, and supports cascading applications, suitable for the access and transmission of IP, A and other data services.
The rich auxiliary interface equipment uses the overhead bytes in the SOH to provide additional data interfaces, and can provide flexible overhead path up and down methods. The auxiliary interface is provided by the system's official board, which can provide users with additional low-speed business applications.
3. Perfect network application and network protection capabilities
Perfect protection function
The Unitrans ZXSM-10G system adopts a redundant design on the hardware, and the system uses a dual-bus structure system, which greatly improves the reliability and stability of the system; the cross-board and clock board 1 + 1 hot backup, and uses a distributed power supply mode, The power distribution system is two independent systems that can be replaced at will.
Unitrans ZXSM-10G system supports multiple network protection applications: link multiplex section protection (1 + 1/1: N), two-fiber unidirectional channel protection ring, two-fiber bidirectional multiplex section shared protection ring, four-fiber bidirectional multiplex Use segment sharing protection ring, dual node interworking function (DNI), subnet connection protection (SNCP), logical subnet protection, etc.
With the development of SDH technology, the speed of the network is getting higher and higher, and the number of multiplexed VCs is also increasing. In practical applications, the topology of the SDH network is complicated and each VC channel carries The services are different, and different services have different security requirements for the network, which brings difficulties to the protection and management of network services. The Unitrans ZXSM-10G system provides logical subnet protection, which can adapt to complex network structures, enhance network security, and increase bandwidth utilization.
The logical subnet is a method of dividing the network based on the logical topology and logical capacity of the network. The physical network is divided into multiple logical subnets. The service protection and management of each logical subnet can be independently performed without interference. The logical sub-rings can adopt different protection methods, which improves the flexibility of network protection. Using logical subnet protection has the following advantages:
1) Multiple protection methods can be run on the same physical network, which enhances the flexibility of network protection
2) Reasonable use of bandwidth resources improves bandwidth utilization
The Unitrans ZXSM-10G system has rich service interfaces and huge service capacity, which can form complex nodes. At the same time, due to the advanced design of the system, a single physical device can be logically divided, and the complex devices can be divided into multiple according to network requirements. Logical devices (such as split into multiple ADM, REG and other logical devices), the logical devices can be independent of each other, or can be connected and scheduled through the cross network of physical devices, so that the system has better adaptability to the network , To meet the needs of complex network applications.
Overhead transparent transmission function
The Unitrans ZXSM-10G system supports the transparent transmission function of overhead. The service and overhead of low-speed signals can be transparently transmitted in S-64 frames. When 4 S-16 systems are transmitted through the Unitrans ZXSM-10G system, the overhead transparent transmission function is applied, and 4 sets of S-16 signals can be independently and transparently transmitted in the Unitrans ZXSM-10G system, so that the Unitrans ZXSM-10G system can be realized Similar effect with WDM system.
Adopting the overhead transparent transmission function can greatly improve the flexibility of network construction and solve the situation of shortage of optical fiber resources. For example, in the network construction, the original S-16 network and the newly-built S-64 network can share the optical fiber resources of the intersection of the two rings. The overhead transparent transmission function is used to transparently transmit the S-16 signal of the original network. The network is still independent, and its business configuration and protection methods do not need to be changed.
The overhead transparent transmission function can ensure the unity of network management and the continuity of network management information, and realize the unified management of remote subnets.
4. Adaptability of metropolitan area networks
There are many types of services in the metropolitan area network, including broadband services such as high-speed data services, image services and multimedia services. There is a great demand for network bandwidth. At the same time, in the construction of the metropolitan area network, there is also the contradiction of insufficient fiber resources. Network bandwidth demand is a major issue in the construction of metropolitan area networks.
Unitrans ZXSM-10G system provides a 40 × 10G built-in metropolitan area network DWDM system, which can provide up to 400G network bandwidth, while effectively solving the problem of optical fiber resources. The service interface of the Unitrans ZXSM-10G system can provide a color optical interface that meets G. 692, which is directly used in conjunction with the built-in DWDM system to reduce network costs. Unitrans ZXSM-10G can be applied at the core layer of the metropolitan area network and is the mainstream equipment for the construction of the metropolitan area network.
The metropolitan area network DWDM system allows network operators to provide transparent wavelength-based services. In this way, users can flexibly transmit signals in any format without being limited to the structure and format of SDH, and can flexibly and quickly support services of various rates and signal formats. The metropolitan area network DWDM system also has wavelength scalability, and new wavelengths can be added at any time without affecting the original operating wavelength. In this way, the system can quickly provide new services by simply adding wavelengths, greatly enhancing the market competitiveness of operators.
5. Perfect timing synchronization processing capability
The system can select multiple timing sources: external clock, SN service interface, and internal clock as the timing reference of the device. The timing system can work in three working modes: synchronous lock mode, hold mode and free oscillation mode.
The system supports synchronous priority switching and automatic switching based on the SSM algorithm. In a complex transmission network, automatic switching based on the SSM algorithm can optimize the timing synchronization distribution of the network, reduce the difficulty of synchronization planning, avoid timing loops, and ensure that the network synchronization is in Best state.
6. Adaptability to existing fiber optic networks
Most existing optical fiber networks use G.652 optical fiber, and the problem of dispersion compensation needs to be solved when transmitting 10Gb / s services on standard G.652 optical fiber. The Unitrans ZXSM-10G system uses advanced dispersion management and out-of-band FEC technology to ensure the system's adaptability to the existing G.652 fiber network.
Dispersion management technology
The Unitrans ZXSM-10G system uses pre-chirp technology and a dispersion compensation unit (DCU) to perform dispersion compensation. The combination of the two methods can provide different amounts of compensation to meet the needs of different transmission distances.
Out-of-band FEC technology
Due to the high transmission rate of the S-64 system, in order to ensure a low bit error rate, the receiver requires high optical power, so the transmission distance of the system is reduced accordingly. The Unitrans ZXSM-10G system uses out-of-band forward error correction technology (out-of-band FEC) to improve the error performance of the system. Since the extra-band FEC is outside the SDH frame signal, the number of additional bits is not limited, and its error correction The ability is greatly enhanced, which can increase the system's signal-to-noise ratio by 6 to 8 dB and increase the system transmission distance by 20% to 40%.
7. Perfect network management capabilities
Unitrans ZXSM series products all adopt Unitrans ZXSM-IMS integrated network management system. Unitrans ZXSM-IMS adopts N design concept to provide management of network element layer, network element management layer and network management layer, with system, performance, configuration, fault and security With perfect management functions, it has a friendly full Chinese man-machine interface and simple operation.
The Unitrans ZXSM-IMS system provides reliable backup functions. A subnet can be connected to multiple network management systems, which not only realizes segmentation and sub-regional management, but also greatly enhances the reliability of the network management system.
Unitrans ZXSM-IMS system can provide f, Qx and standard Q3 interfaces for network management system access. It can realize automatic service configuration and network-level circuit scheduling, which is convenient for users to use and manage.
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