Cdma based network video surveillance system solutions

Xiamen Caimore Communication Technology Co.,Ltd
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Sales06@caimore.com skype:caimoremichelle
Tel:+86 592 5901215 Web: www.caimore.com/emain.asp
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CDMA-based network video surveillance System Solutions
Introduction
In 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 the
primary means of security surveillance. With the rapid development of communication
technology and computer network technology, wireless network technology has
become a computer network in a vital part, but also the rapid expansion of its
applications. Due to the remote video monitoring system to achieve the goal of remote
monitoring, remote control and other functions, providing new tools for unattended
applications. CDMA technology enables cost appears reasonable, relatively low
technical threshold of wireless data transmission technology site in the monitoring
system to the real-time data transmission remote monitoring center possible.
CDMA is (Code Division Multiple Access) Code Division Multiple Access
technology, is an advanced wireless spread spectrum communication technology in
recent years, for digital cellular mobile communications.
CDMA allows users to send and receive data at end packet transfer mode, without
the 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 easily
achieve 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 the
CDMA RUTER to complete. En overall CDMA RUTER with the monitoring center on
two programs: CDMA + Internet connection; CDMA network connection. Its system
topology 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 Netcom
and other telecommunications companies to provide dedicated access IP typically
receive a fixed public IP address, which is accessible on the Internet IP address,
connection RUTER with the monitoring center server via CDMA + Internet, security
levels 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 communications
technology 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 online
home. .C%] 3G.]% C'l
CDMA network connection can be dedicated access or CDMA terminal
connections. Line access via data lines connected by mobile operators PDSN (CDMA
router) to the monitoring center, the monitoring center to obtain a fixed IP address
within the network. RUTER network IP address obtained in the same network
segment, its data security is good; a small delay; high cost.
CDMA terminal connections require mobile operators assigned to the
monitoring center CDMA network fixed IP address; open-end CDMA user data
communication. RUTER establishing data channel based on the configuration of the
monitoring center network in the IP address with the monitoring center. CDMA
terminal connection has yet to be technically better is to support, the practical
application 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 the
application. From the most economical way to consider the monitoring center using
"ADSL (Dynamic IP) + dynamic domain name" solution. Connection terminal and the
monitoring center is based Socket Communications.
Achieve three systems
1 terminal part
Terminal portion of the image acquisition by the camera DTU, microprocessor and
CDMA RUTER components. Camera DTU is responsible for collecting image data
collected by the microprocessor, the microprocessor by CDMA RUTER send data to
the remote monitoring center.
1.1 DTU and camera interfaces
DTU 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 compression
algorithm compresses the original image JPG format, the compression function to
improve the usefulness of remote video surveillance system.
DTU camera data interface is RJ45 interface, using a + 5V supply input. Pin
function 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 the
falling edge of this signal. This interrupt signal indicates that the output has a new
image data on the JPEGD7..JPEGD0 pins.
DTU camera has an internal reset and initialization process after power enters the
standby mode after initialization is complete. In the standby mode, the camera DTU
loop 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 notify
the 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 microcontroller
checks the received data, when receiving "0XFF", when "0XD9", indicates that the file
end, this acquisition is complete. Then the camera DTU will return to the standby
mode.
Microcontrollers TMS320LF2407A, clocked at 40M, IOPC mouth used to read data
DTU camera, camera DTU interrupt output (CAPINT) connected to TMS320LF2407
of XINT1, falling edge; output enable (CAPEN) connected IOPE0. TMS320LF2407
expanded 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 must
solve level conversion. In this paper, SN74LVC245A chip to achieve the + 5V supply
and a + 3.3V power supply system mobile.
Level translation between systems.
1.2 CDMA transmission section
After the microcontroller to collect image data to be transmitted to the control
center via the Internet data. The complete system microcontroller and Internet
network communication work is CDMA RUTER and CDMA network. Because CDMA
is based on IP protocol, but ordinary CDMA RUTER no embedded TCP / IP protocol
stack, 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 order
to reduce the workload of the application itself and increase the practicality of the
system, the system uses the Xiamen Caimore Communication Industrial CDMA
RUTER, model CM6550R, which is embedded with TCP / IP protocol stack, with
Socket communication, and provide transparency data transmission channel, the user
can set some parameters can realize embedded systems connected directly to the
Internet, 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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◆ support dynamic data center domain names and IP addresses;
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◆ support for audio interface for easy maintenance operations;% g; h5t2B6H'R6f
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◆ 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 IP
address (or dynamic domain name server can resolve the domain name) and port
number; Socket communication type (TCP or UDP); communication interface
parameters; trigger mode settings.
CDMA RUTER after each boot automatically dial the access CDMA and
dynamically obtain an IP address, this IP address is CDMA backbone network
addresses, without entering the connected state, the server (monitoring center) is not
directly communicate with the CDMA RUTER a. CDMA RUTER initiative to connect to
the server to send the data. When the connection route is established, the server and
the 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 to
dynamically allocate server, if a long time do not communicate, ISP server will reclaim
IP, in order to facilitate the effective use of IP resources) to ensure timely mutual
communication between the server and the terminal, so the monitoring center can
actively sends data to the image capture terminal acquisition command and other
parameters. In addition, the "heartbeat" packet contains the ID information of the
terminal, so the server can easily determine industry source routing and data packets.
2 . Construction of the monitoring center
In this paper, the monitoring center using ADSL connection, because the IP
address each time you connect acquired is not fixed, CDMA RUTER not directly point
to a remote monitoring center. To address each time you connect the server IP
address is not fixed, we use a dynamic DNS solution. DDNS function, namely to
achieve a fixed domain name to resolve dynamic IP addresses. Internet monitoring
center after each get a new IP address, the computer installed in the control center of
the 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, thus
ensuring the safety of the control center, the firewall machine may be a software
firewall, it can also be a hardware firewall.
In this paper, the control center software can be VC / VB / Delphi written internal
DLL in Sang-technology, used to complete the preparation Socket program. Basic
control 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 original
is still responsible for monitoring Socket listen, you can exchange data after any
communication link was established. Monitoring center software should have ID
display terminal on the monitor screen and multiple images on the hard disk, and
storing the image display different terminals. Through the image analysis and
processing, such as abnormal alarm signal is given and the alarm information to the
remote 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 the
current state of each terminal.
4 . Conclusion
With increasing levels of production management, remote video remote monitoring
has been widely used, more and more mature, and is moving network, intelligent
direction. CDMA wireless transmission of data using the communication method to
solve the communication problem of remote monitoring system, compared to other
wired communication has incomparable superiority. Since the transmission of the
image data, the amount of data and more frequent, may choose not to limit the use of
business packages more economical. Our laboratory constructed in the wireless
video remote monitoring, to obtain the desired results. Moreover, with the gradual
improvement of mature CDMA network and application technology, CDMA
applications will be more broad. CDMA wireless transmission system presented here
can be extended to a variety of needs testing, monitoring and security of the
environment.

Cdma based network video surveillance system solutions

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Cdma based network video surveillance system solutions