To become independent of world's 3G standards and not to pay for patents and licenses, the CATT (Chinese Academy of Telecommunications Technology) decided to develop its own standard.
Cooperating with Siemens company, Chinese engineers chose TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) as the transmission technique for their national equivalent of 3G.
This month the standard was officially accepted, and the first commercial mobile is already deployed on the market. Currently the system is under test in (among others) the six future Olympic cities.
The TD-SCDMA technique uses bidirectional transmission with time sharing, i.e. there is common carrier frequency both for downlink and uplink connections, i.e. one physical channel. So, in a way, it is the opposite approach to the issue than that preferred e.g. in Europe - UMTS WCDMA uses two channels.
The essence of the method consists in assignment of orthogonal codes to different signals that can be transmitted on the same frequency. Additionally, the base stations synchronize time slots, which improves orthogonality of the signals.
Such transmission characteristics allows to use this technique in mobile TV.
- input signal level measured at amplifier's input is 75 dBuV,
- gain of ZG amplifier is set to 45 dB, which results in 120 dB at the output.
In the example it is assumed that the lengths of the cables from taps to the outlets (BM-100 R90737) are 30 meters. Line sections are connected to the output of the set of channel amplifiers via the R-6 R60106 splitter and TRISET-11 cable. The same cable forms the beginning of each line going from output of the R6 splitter to the first tap (R602620). Attenuation of the TRISET-113 E1015_100 and TRISET-11 E1025_100 has been determined according to their specifications.
After the installation has been made, the installer should measure signal levels in the outlets, with the use of signal level meter - to verify the calculated values.The norms for TV distribution systems determine the acceptable range of signal level as 62 to 80 dBuV.
Number of outlet ->
Length of TRISET-11 [m]
Length of TRISET-113 [m]
Attenuation of the TRISET-11 [dB]
Attenuation of the TRISET-113 [dB]
Attenuation of R-6 splitter [dB]
Attenuation of O-X-1 tap [dB]
Attenuation of O-X-2 tap [dB]
Attenuation of O-X-3 tap[dB]
Attenuation of outlet [dB]
Reserve (e.g. loss in connectors) [dB]
Total attenuation of the network [dB]
Output level (120 dB) [dB]
The cameras provide video streams at speed of 25 fps to the server. Due to limited disc space, the NVR server records only 8 fps, but the operator can watch live images at full speed (25 fps) - thanks to the available bandwidth. The next computers working in another subnetwork are constrained by its low bandwidth so that they guarantee only 1 fps. But using Internet Explorer the computers provide access to the images and the previously recorded material.
Such client-server architecture allows deployment of wide-area systems, with highly flexible adjustment to limited network and recording capacity.
These were the decisive factors influencing choice of IP CCTV system in Spedkol company in Kedzierzyn-Kozle. The main problem in monitoring large industrial areas is cabling. Ripping up the roads, breaking through railway embankments etc. would make such undertaking too expensive, or even - due to current operational environment - practically impossible. So the priority was limitation of wired solutions and use of wireless transmission.
The monitoring system uses 8 IP cameras P400 K1131 from Pixord in Marathon housings. As managing and recording software there has been used professional software package Pixord P6032 that, among other functions, allows for:
- live monitoring and continuous or triggered by events recording of images from 32 cameras,
- PTZ control,
- advanced playback functions, including export of archives to any digital video format used in OS,
- export of images to any external monitoring center (remote monitoring)
The both video servers support PELCO-P, PELCO-D, Li-Lin, and DynaColor protocols, which allows to control practically all types of analog PTZ cameras. The PTZ functions and viewing of the images is performed via Internet browser. In the case of K2131, the control is also possible through use of NVR software packages, e.g. P6032 (free addition to this model), as well as NUUO K3108, Milestone and many others.
MJPEG/MPEG-4 video server Pixord P1401 K2131
4-channel MJPEG/MPEG-4 video server Pixord P4504 with HDD option - K2132
The problems can be solved by choosing the DVRs equipped with DVD recorders. CP-CAM company offers the models CPD-505DVD M85077 and CPD-507DVD M8537. Besides recording of video, the DVRs can also record several audio channels. The newest firmware enables the user to make backup of event-triggered recordings onto DVD discs that can be later played on any PC. Of course, the video is synchronized with audio files. The DVD discs make always available archives, while the DVR working in overwrite mode can continuously record new data.
DVRs with DVD recorder
Configuration of a wireless card is rather a straightforward task. According to its user's manual, one should install the needed drivers. The next step is setting appropriate IP address, gateway address of the rourter, mode of work, SSID of access point, and cipher keys. In the case of configured DHCP server, it is enough to set automatic assignment of IP and DNS parameters. Choosing a wireless adapter it is important to determine whether it supports the same data encryption method that is used by the access point.
The main purpose of the ALARM fair is to present offers related to security and emergency warning systems, video surveillance systems, personal protection means, equipment for special prevention squads and other modern professional solutions. In the pavilions of Kielce Trade Fairs visitors can become acquainted with services offered by security firms, investigation agencies, and insurance companies.
The fair is accompanied by the conference "Town Security - Video Surveillance of Urban Areas", the element of the program developed and implemented by Polish National Police in the largest cities.