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Development Background
For many years, traditional TMD (Time Division Multiplex) switching technology is one of the core technologies in multi-service bearer networks. However, with the rapid development of the technology in the communication industry, the core network (IMS) and bearer network based on IP technology have matured and deployed on the scale of the network, and have the ability to replace traditional TDM equipment. At the same time, a large number of TDM equipments have been running on the network for more than 20 years, the equipment has an aging failure rate, and the operation and maintenance is inconvenient. Operators have been seeking a suitable TDM network.
At present, the networks of major operators are transforming from traditional circuit-switched networks to next-generation networks based on IP technologies. Private network users lease operators' transmission circuits, and more IP circuits are provided to enable various types of single-service types. Vertical networks continue to converge and evolve toward horizontal tiered networks that carry multiple types of services.
However, when the private network user is preparing to multiplex the service into the IP circuit, the IP circuit is difficult to predict and control the delay and delay jitter, and it is difficult to meet the requirements of the audio and video data transmission with high timing requirements.
New generation IP bearer network
In response to the above background, our company has put forward a set of applications and solutions for a new generation of multi-service IP bearer network based on IP link, E1/2M link, optical fiber or wireless 4G to meet the requirements of unified access, aggregation, exchange, transmission and management of 64K narrowband services and broadband data services, applicable to the current development trend of IP transmission networks and future wireless 4G/5G layout to solve airports, maritime, power, energy, User access and transmission requirements for private networks such as railways and highways.
This solution provides a new generation multi-service access and transmission platform integrating service access, scheduling and intelligent transmission for the application needs of private network users in various industries, which combines the excellent transmission performance of SDH technology and the PSN network. Efficient performance, adding multi-level redundancy protection technology and intelligent network management technology, through the use of dual-star system bus, provides a great space for I/O service access layer, in addition to providing various traditions,the narrowband service interface and modern broadband service interface, and a comprehensive solution for the smooth upgrade capability of future business needs.
The built-in high-capacity cross-matrix and high-throughput packet switching processing module make the distribution and scheduling of services in the network extremely convenient. The application of large-scale SOPC (system on a chip) technology makes the platform self-updating and upgrading. This not only protects the user's existing investment, but also continuously introduces new technologies, so that the platform always maintains technological advancement.
The platform has the following main features:
1. It consists of the system chassis, power board, main control board and I/O service board.
2. Optional 2 main control boards provide dual-master 1+1 protection.
3. Optional 2 power supply boards, 1+1 protection for dual power supply boards, 1+1 protection for dual power supply, DC-48V or AC220V power supply boards.
4. Optional IP link (supports optical IP or electrical IP), E1/2M link, fiber link, wireless 4G link, optional dual-link automatic protection switching, access to the same or different two channel transmission chain implements backup protection.
5. Optional 6 pieces I/O service board slots, each slot does not limit I/O service board. I/O service board can be optional FXO/FXS, 2/4 line audio (E&M), asynchronous/synchronous RS232, asynchronous/synchronous RS422, RS485, 10/100BASE-T, V.21/V.22, V.24, V.34, switch, magnet phone, hotline, V.35, G.703 co-direction 64k etc.
6. A variety of ring testing methods can be selected to facilitate online testing. The replacement of I/O service boards does not lose equipment configuration parameters; each board can be plugged in and out, and the increase or decrease of boards will not affect the normal operation of the system.
7. Optional centralized network management function, automatic loading of network device configuration information, configuration of each port parameter (such as: adjustable audio gain, adjustable E&M signaling mode, radar rate, clock adjustment, etc.), multiple self-loop detection and other functions.
working principle
The next-generation multi-service access and transmission platform consists of system chassis, power board, main control board, and I/O service board.
The main function of the system chassis is to provide signal interconnection between the power board, the main control board, and the I/O service board. This platform uses a modular chassis. The chassis has two dedicated slots for power boards, two dedicated slots for main control boards, and six I/O service boards for common slots.
The power board needs to be inserted into two dedicated slots of the power board to provide working power to all types of cards on the platform. The AC power board or DC power board can be selected. Any one power board can provide the whole platform working power. In order to improve the reliability of the equipment, the platform can also be equipped with 2 power boards, providing 1+1 hot backup, optional 2 pieces AC power boards or 2 pieces DC power boards or 1 piece AC power board and 1 piece DC power board.
The main control board needs to be inserted into two dedicated slots of the main control board, which mainly completes the aggregation, crossover, configuration and transmission of the service signals of each I/O board, and also provides the device network management monitoring function. Each main control board has 2 optical fiber interfaces and 3 Ethernet interfaces. The SDH optical ring network, IP optical ring network or dual optical port 1+1 protection can be formed through two optical interfaces. The Ethernet interface can also be set as the transmission link interface and transmitted through the IP link. In order to improve the reliability of the device, the platform can also select 2 main control boards to provide 1+1 hot backup, or optional single main control board to work independently.
The I/O service board needs to be installed in the general slot of the six I/O service boards. Optional: STM-1 interface board, STM-4 interface board, E1 interface board, FE interface board, voice interface board, audio/E&M Interface board, low-speed data interface board etc. The selected I/O service board uniformly accesses various types of service signals to implement end-to-end communication functions.
