Abstract: This paper presents a design principle and implementation scheme of wireless bank network transmission system based on CDMA, briefly introduces the basic knowledge of CDMA technology, and describes the implementation of CDMA wireless transmission in the application of financial data transmission. Through practical application, the ideal effect has been obtained.
Keywords: CDMA; DDN; bank interconnection; monitoring system;
1. Demand analysis
The financial industry is the main force and the pioneer of the new technology revolution. In order to improve the management level and meet the increasing service needs of the customers, the characteristics of the industry need to be at the forefront of the times in the promotion and application of new technology. The first is the application of the new technology, the state is promoting the modern financial electronic modernization. In the process, we have invested a lot of manpower and material resources. We can say that the equipment and technology used in the financial system are leading in all industries. With the further improvement and improvement of the financial security system and theory, it is bound to require the financial industry to apply the new and new high-tech achievements, lead the whole industry into a new step, provide the most secure and most considerate service guarantee, and set up its own industry image.
With the progress of the economy and the intensification of competition in the banking industry, the bank service outlets (business department, ATM machine, self-service point) are covering every corner of the city with unprecedented speed and quantity, and the interconnection and intercommunication of various service outlets is realized. This process brings more convenience to the customers. But the bank itself has a new test of the network technology requirements, the existing central machine room and the far end of the network in general through the DDN line or telephone line Modem dialing. However, in order to ensure the security of data service transmission, these two kinds of network solutions not only have expensive system installation costs, but also the system is not extensible. It has brought many inconvenience to the maintenance of the system. Therefore, banks always hope to find a convenient, cost-effective, online and stable communication mode to improve the service quality of banks. Now China Unicom's CDMA1X network is a new way to meet this demand. It can completely replace the past cable dial-up, cable DDN, and also have a qualitative leap in performance and price.
Two, CDMA1X network and its characteristics
CDMA is the Code Division Multiple Access (abbreviation for code division multiple access). It is a new and mature wireless communication technology developed in the branch spread spectrum communication technology of digital technology. The principle of CDMA technology is based on spread spectrum technology, which is modulated by a high speed pseudorandom code which has a certain signal bandwidth information with a bandwidth that is far greater than the bandwidth of the signal. The bandwidth of the original data signal is extended, and then transmitted by carrier modulation. The receiver uses the identical pseudorandom code and the received bandwidth signal for correlation processing to transform the wideband signal into the narrow band signal of the original information data, that is, the despreading, in order to realize the information communication. CDMA multiple access technology is fully suitable for the large capacity, high quality, comprehensive service and soft handover required by modern mobile communication network, and is being favored by more and more operators and users.
CDMA2000 is a proposal for the third generation mobile communication air interface standards proposed by the United States to ITU. It is a technical system for the evolution of the IS-95 standard to the third generation. This is a broadband CDMA technology. The highest indoor data rate in CDMA2000 is above 2Mbit/s, 384kbit/s in walking environment and 144kbit/s above vehicle environment. Cdma2000-1X refers to the first phase of CDMA2000 (the rate is higher than IS-95, lower than 2Mbit/s), and it can support the data transmission of 308kbit/s, the network part is introduced into the packet switching, and the mobile IP service can be supported. The spread spectrum rate of cdma2000-1X is SR1, which means the single carrier direct sequence spread spectrum mode with forward and backward channels using chip rate 1.2288Mbit/s. Therefore, it can be conveniently compatible with IS-95 (A/B) backward and achieve smooth transition. Operators can deploy cdma2000-1X systems with the same carrier in some CDMA one, which demand high speed data services, and reduce the investment of users and operators. Because cdma2000-1X adopts new technologies such as coherent demodulation, fast forward power control, transmit diversity and Turbo coding, its capacity is much larger than that of IS-95. Under the same conditions, for Mandarin voice business, the capacity is roughly two times that of the IS-95 system.
Xiamen sang Rong Technology Co., Ltd. has launched a series of wireless modem products to meet the growing demand for wireless data services in various industries. Among them, Saro6230r CDMA Router series wireless CDMA modem supports IS-95A/B,
CDMA 2000 1x RTT interface, embedded communication protocol processing module, mainly for financial, electricity, environmental protection, traffic and other industries customers, the application is: the Saro6230r CDMA Router equipment and industry embedded equipment, embedded in professional equipment in the industry, so that industry equipment to achieve wireless data transmission. For example, it is connected with the ATM and terminal equipment of the financial industry to realize wireless data transmission of financial equipment; to match the wireless data transmission with the power detection equipment to realize the wireless data transmission of the power equipment; to match the oil field detection equipment to realize the wireless data transmission of the oil field detection equipment; and to match the environmental detection equipment to realize the wireless data transmission of the environmental equipment. Wait。 The CDMA1X communication mode is more suitable for the bank network service. At present, the data center of the provincial bank and the business hall use DDN 64K to transmit the data, and the cost is high and the networking is difficult.
CDMA1X wireless transmission data have the following advantages:
1) CDMA1X users are free to distribute and move their own networks, without worrying about maintenance of lines or when cable is moving.
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