Industrial 4 g 3g fdd tdd lte router 3g router cdma based network video surveillance system solutions

Xiamen Caimore Communication Technology Co.,Ltd2 F, 37#, Wanghai Road, Software Park 2, Xiamen,China (361009)

Web: www.caimore.com/emain.asp Contact:Peter Zhang Email: [email protected]

Tel:+86 592 5901215 Web: www.caimore.com/emain.asp

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CDMA-based network video surveillance System SolutionsIntroductionIn recent years, mobile communication, video surveillance for its intuitive, easy to

use, rich content and are widely used in many important occasions, it has become theprimary means of security surveillance. With the rapid development of communicationtechnology and computer network technology, wireless network technology hasbecome a computer network in a vital part, but also the rapid expansion of itsapplications. Due to the remote video monitoring system to achieve the goal of remotemonitoring, remote control and other functions, providing new tools for unattendedapplications. CDMA technology enables cost appears reasonable, relatively lowtechnical threshold of wireless data transmission technology site in the monitoringsystem to the real-time data transmission remote monitoring center possible.

CDMA is (Code Division Multiple Access) Code Division Multiple Accesstechnology, is an advanced wireless spread spectrum communication technology inrecent years, for digital cellular mobile communications.

CDMA allows users to send and receive data at end packet transfer mode, withoutthe need to use circuit-switched mode network resources. Thus providing an efficient,low-cost wireless packet data services.

Advantages CDMA data transmission comprising:(1) high transmission rate, the maximum theoretical bandwidth of up to 230.4kb / s;

MSCBSC Mobile Communication Forum,(2) always-on, real-time transmission of data;(3) by traffic charges, and reasonable price;(4) IP-based access to the entire Internet.Remote video monitoring system CDMA network using wireless propagation

medium, got rid of cable bound within a certain range can transform any location.Without active area restrictions, through CDMA communications network, can easilyachieve remote mobile monitoring.

Two systems networking solutions| After the country terminal image data collected, data should be sent to the

monitoring center, and some wireless data transmission function of the terminal by theCDMA RUTER to complete. En overall CDMA RUTER with the monitoring center ontwo programs: CDMA + Internet connection; CDMA network connection. Its systemtopology shown in Figure 1 and Figure 2.

(A) the system topology 1

The monitoring center Internet access, and access methods are a variety of ways,as long as the public IP address (dynamic or static) can be. Telecom, China Netcomand other telecommunications companies to provide dedicated access IP typicallyreceive a fixed public IP address, which is accessible on the Internet IP address,connection RUTER with the monitoring center server via CDMA + Internet, securitylevels lower, but may by connecting the carriers via VPN tunnel to the monitoring

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center server, which can greatly increase the security level and can reduce the delay.

Figure 1 - system topology 1: CDMA + Internet connection

B) mobile communication system topology forum for leading communicationstechnology forum, we specialize in mobile communications technology,communications engineers online home. ._2I; R + R5_

The mobile communication forum for leading communications technology forum,we focused on mobile communication technology, communications engineers onlinehome. .C%] 3G.]% C'l

CDMA network connection can be dedicated access or CDMA terminalconnections. Line access via data lines connected by mobile operators PDSN (CDMArouter) to the monitoring center, the monitoring center to obtain a fixed IP addresswithin the network. RUTER network IP address obtained in the same networksegment, its data security is good; a small delay; high cost.

CDMA terminal connections require mobile operators assigned to themonitoring center CDMA network fixed IP address; open-end CDMA user datacommunication. RUTER establishing data channel based on the configuration of themonitoring center network in the IP address with the monitoring center. CDMAterminal connection has yet to be technically better is to support, the practicalapplication of this method is rarely used.






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Figure 2 - system topology 2: CDMA network connection

How to decide what kind of program, the key is determined by the nature of theapplication. From the most economical way to consider the monitoring center using"ADSL (Dynamic IP) + dynamic domain name" solution. Connection terminal and themonitoring center is based Socket Communications.

Achieve three systems1 terminal partTerminal portion of the image acquisition by the camera DTU, microprocessor and

CDMA RUTER components. Camera DTU is responsible for collecting image datacollected by the microprocessor, the microprocessor by CDMA RUTER send data tothe remote monitoring center.

1.1 DTU and camera interfacesDTU is a camera with video capture and compression functions of the camera, it

functions as a digital camera is very similar. DTU camera using standard compressionalgorithm compresses the original image JPG format, the compression function toimprove the usefulness of remote video surveillance system.

DTU camera data interface is RJ45 interface, using a + 5V supply input. Pinfunction as follows: |◆ CAPEN: used to enable or disable the camera DTU output image. CAPEN = 1,

allows the output image, CAPEN = 0, then disable the output image.◆ JPEGD7..JPEGD0: parallel data output. 8 output image data in this group of

pins.◆ JPEGINT: DTU from the camera to an external microcontroller interrupt signal is

a positive pulse width of about 10us, the microcontroller can trigger an interrupt on thefalling edge of this signal. This interrupt signal indicates that the output has a newimage data on the JPEGD7..JPEGD0 pins.

DTU camera has an internal reset and initialization process after power enters thestandby mode after initialization is complete. In the standby mode, the camera DTUloop checks CAPEN pin, if CAPEN = 1, in the JPEGD7..JPEGD0 pin continuous






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output data, each output data, to generate an interrupt signal on JPEGINT pin to notifythe micro The controller reads the data. DTU camera output is a complete JPG file,JPG file is always "0XFF", "0XD8" start and "0XFF", "0XD9" end. The microcontrollerchecks the received data, when receiving "0XFF", when "0XD9", indicates that the fileend, this acquisition is complete. Then the camera DTU will return to the standbymode.

Microcontrollers TMS320LF2407A, clocked at 40M, IOPC mouth used to read dataDTU camera, camera DTU interrupt output (CAPINT) connected to TMS320LF2407of XINT1, falling edge; output enable (CAPEN) connected IOPE0. TMS320LF2407expanded 64K bytes of SRAM as an image cache. Because the camera is used DTU+5 power supply, TM320LF2407 uses a + 3.3V power supply, so the interface mustsolve level conversion. In this paper, SN74LVC245A chip to achieve the + 5V supplyand a + 3.3V power supply system mobile.

Level translation between systems.

1.2 CDMA transmission sectionAfter the microcontroller to collect image data to be transmitted to the control

center via the Internet data. The complete system microcontroller and Internetnetwork communication work is CDMA RUTER and CDMA network. Because CDMAis based on IP protocol, but ordinary CDMA RUTER no embedded TCP / IP protocolstack, the need to provide TCP / IP support for users. That is, the need to embed TCP/ IP in CDMA RUTER use of PC systems, this is a complex and tedious work. In orderto reduce the workload of the application itself and increase the practicality of thesystem, the system uses the Xiamen Caimore Communication Industrial CDMARUTER, model CM6550R, which is embedded with TCP / IP protocol stack, withSocket communication, and provide transparency data transmission channel, the usercan set some parameters can realize embedded systems connected directly to theInternet, to achieve network interconnection.

The main features of CDMA RUTER◆ easy to use, flexible, and reliable;◆ embedded in a complete TCP / IP protocol stack, including PPP, TCP, UDP,

Socket, STMP, etc;◆ supports RS-232 and Rj45 Interface;◆ After power automatic dial-up, has been online, disconnected automatically

connect; |! Leading communications technology forum 9g f2} 9t & b◆ transparent data transmission mode, the parameters can be set freely;






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MSCBSC Mobile Communications Forum; ~ -d7b; u & c4b8T (L: ~ 5y) D◆ support dynamic data center domain names and IP addresses;

www.mscbsc.com6} 7h s @, M |) _, k!◆ support for audio interface for easy maintenance operations;% g; h5t2B6H'R6f

&} A2Q!◆ System configuration and maintenance interface;◆ Power interference and heat dissipation, harsh working conditions;Before using CDMA RUTER must set parameters to decide to enter transparent

data transfer mode works. Parameters need to be set are: the monitoring center IPaddress (or dynamic domain name server can resolve the domain name) and portnumber; Socket communication type (TCP or UDP); communication interfaceparameters; trigger mode settings.

CDMA RUTER after each boot automatically dial the access CDMA anddynamically obtain an IP address, this IP address is CDMA backbone networkaddresses, without entering the connected state, the server (monitoring center) is notdirectly communicate with the CDMA RUTER a. CDMA RUTER initiative to connect tothe server to send the data. When the connection route is established, the server andthe terminal can double the site for data transmission. The route has a time limit,generally only tens of seconds, in order to ensure that the link has been smooth,CDMA RUTER has a link keep-alive function, by regularly sent: "Heartbeat" packets,maintain routing (dynamic IP by the terminal and the server ISP service providers todynamically allocate server, if a long time do not communicate, ISP server will reclaimIP, in order to facilitate the effective use of IP resources) to ensure timely mutualcommunication between the server and the terminal, so the monitoring center canactively sends data to the image capture terminal acquisition command and otherparameters. In addition, the "heartbeat" packet contains the ID information of theterminal, so the server can easily determine industry source routing and data packets.

2 . Construction of the monitoring centerIn this paper, the monitoring center using ADSL connection, because the IP

address each time you connect acquired is not fixed, CDMA RUTER not directly pointto a remote monitoring center. To address each time you connect the server IPaddress is not fixed, we use a dynamic DNS solution. DDNS function, namely toachieve a fixed domain name to resolve dynamic IP addresses. Internet monitoringcenter after each get a new IP address, the computer installed in the control center ofthe dynamic domain name software will put the IP address to the dynamic DNS server,update the DNS database. CDMA RUTER initiated by the domain Socket connection,dynamic DNS server returns the correct IP address to it.

Firewall Control Center and the Internet to shield out all unused ports, thusensuring the safety of the control center, the firewall machine may be a softwarefirewall, it can also be a hardware firewall.

In this paper, the control center software can be VC / VB / Delphi written internalDLL in Sang-technology, used to complete the preparation Socket program. Basiccontrol center software flow chart shown in Figure 4. Socket port control center






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responsible for the listener listens for connection requests image collection terminal,when listening to a connection request to establish a communication link, the originalis still responsible for monitoring Socket listen, you can exchange data after anycommunication link was established. Monitoring center software should have IDdisplay terminal on the monitor screen and multiple images on the hard disk, andstoring the image display different terminals. Through the image analysis andprocessing, such as abnormal alarm signal is given and the alarm information to theremote terminal to activate the alarm device to prevent vandalism, theft and the like.Related managers can be viewed directly monitor site, and feel free to tune to see thecurrent state of each terminal.

4 . ConclusionWith increasing levels of production management, remote video remote monitoring

has been widely used, more and more mature, and is moving network, intelligentdirection. CDMA wireless transmission of data using the communication method tosolve the communication problem of remote monitoring system, compared to otherwired communication has incomparable superiority. Since the transmission of theimage data, the amount of data and more frequent, may choose not to limit the use ofbusiness packages more economical. Our laboratory constructed in the wirelessvideo remote monitoring, to obtain the desired results. Moreover, with the gradualimprovement of mature CDMA network and application technology, CDMAapplications will be more broad. CDMA wireless transmission system presented herecan be extended to a variety of needs testing, monitoring and security of theenvironment.



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Industrial 4 g 3g fdd tdd lte router 3g router cdma based network video surveillance system solutions