Network Video Servers Enable Analog ,Digital Convergence

Chinese video surveillance manufacturers like Chenova, Desay, Dahua, ESK, Hikvision and HighEasy are launching digital video servers (DVS) with customized local storage functions to add value.


Chinese vendors are launching DVRs and DVSs with the latest compression algorithms, such as H.264, to reduce file size and improve network  transmission. Popular models use MPEG-4 or H.264 with local storage functions — USB ports or embedded HDD — optional.


DVSs feature high-performance DSP or Linux OS with high-compression video algorithms. High-end products deliver real time for each channel as well as multi-zone motion detection, privacy masking, video signal loss alarm, view tampering alarm, position-configurable OSD and LOGO, adjustable frame rates, and dual-stream and substream support of CIF and QCIF.


Network DVSs support TCP, UTP, RTP, Multicast, DHCP, ADSL (PPPoE) and narrow-band (PSTN) dialup. They are also equipped with remote parameter setup, upgrade of DVS firmware and PTZ control. For example, Dahua's EC series network video servers.


Take Desay's DS-WS0460, which offers barometric pressure of 86 kPa to 106 kPa, a four-channel BNC to input video and MPEG-4 compression. Video resolution is 2D1+2CIF, while the one for images is 400 lines. Maximum frame rate is 25+/-3 frames per second and video bit rate is 32 kilobits per second to four megabits per second. Transfer delay is less than 120ms and efficiency is greater than 99.3 percent. Gray grade is over 10 with bandwidth of four MHz or greater.


The DVS also has one channel to input audio and one for output. With ADPCM audio compression, audio bit rate is 128 kilobits per second. Control ports are RS-485 and RJ45 with eight I/O in and two I/O out. Power is 187 volts to 242 volts; 50+/-1Hz, four watts to eight watts. Operating environment is from -3 to 57 degrees Celsius and barometric pressure is 86 to 106 kPa.


Second, ESK's EN-1582C two-channel network video sever has high-tech embedded MPS processors and a real-time embedded Linux operating system. With dual-stream support, network transmission and storage are completely independent. Equipped with MPEG-4 video compression and MP3 audio compression, users get high-definition images with a low code rate. The high definition network video server offers D1, half D1, CIF and QCIF, while the Web server simplifies operations via a browser that enables remote surveillance, control and setting.


In addition, the two-way phone make communication easy, and it has the most advanced network server transmission technology so multiple users can use the DVS. It also comes with a USB port to do local recording that can be played on Microsoft Media Player. The product also comes with inputs and outputs for motion, date and time, and it supports real-time surveillance via mobile phones, real-time front-end image capture and 802.1 wireless networking or transfer (CDMA, GPRS).


Third, HighEasy's most popular model is the HY-6104HC with four channels of video and four audio inputs, compression of three channels (D1) and three channels (CIF). It also features four-channel alarm input and two-channel alarm output. With a USB HDD, users can store images locally. It also provides the most advanced SoC chip Viper II (PNX8950), which not only integrates a MIPS processor and 2 PNX1501 TM3260 core, but also many video and audio processors.


The HY-6104HC has a Linux operation system with good network transmission and high stability. Several compression formats are optional, including D1, half D1, CIF, H.264 and enhanced H.264. With enhanced H.264, compression code rate is only 60 percent of H.264 and delay in LAN is less than 200 ms. Management, SDK and customer development packages shorten development time. Duplex audio talk is provided. Central management software and Video Master are supplied for low network cost and added convenience. Fourth, with USB 1.1 storage interface, Chenova's CF-DVS04B1 network DVS has H.264 video and G.726 audio compression with four-channel BNC to input video, four-channel BNC (2.0Vp-p) to input audio and one-channel RCA for output. Resolution in PAL is 352 pixels by 288 pixels and 176 pixels by 144 pixels; in NTSC, it is 320 pixels by 240 pixels and 160 pixels by 120 pixels. Frame rate in PAL is zero to 25 frames per second; in NTSC, it is zero to 30 frames per second.


It also delivers video stream or video and audio streams from 16 kilobits to four megabits per second, and uses one RS232 port and one RS485 port for communication; RJ45 (10/100M self-adaptive) is used with the Internet. It features four channels (on/off) to input pixels (4 CIF), 528 pixels by 384 pixels (D CIF), 704 pixels by 288 pixels (2 CIF), 352 pixels by 288 pixels (CIF), 176 pixels by 144 pixels (QCIF); for NTSC, it is 704 pixels by 480 pixels (4 CIF), 528 pixels by 320 pixels (D CIF), 704 pixels by 240 pixels (2 CIF), 352 pixels by 240 pixels (CIF), 176 pixels by 120 pixels (QCIF). Frame rate is 1/16 to 25 frames per second (PAL), and 1/16 to 30 frames per second (NTSC). It also has one RJ45 10M/100M UTP network, one RJ45 RS-232 and one RJ45 RS-485 port for communication. It works in humidity levels from 10 percent to 90 percent.


Fifth, Hikvision's DS-6000HCI series net DVS is designed for remote surveillance with embedded OS and MCU. The DS-6001HCI adopts one video input and audio input and provides a maximum support of 4 CIF in real time. The DS-6004HCI also has four video and audio inputs; the product enables CIF resolution in all channels or the first two channels in 4 CIF and the other two closed. Internet Explorer provides network preview and remote alarm  information. Other functions include network voice talk, PTZ remote control and multiple user management. Automatic recovery delivers high reliability. Compressed resolution (in PAL) is 704 pixels by 576pixels (4 CIF), 528 pixels by 384 pixels (D CIF), 704 pixels by 288 pixels (2 CIF), 352 pixels by 288 pixels (CIF), 176 pixels by 144 pixels (QCIF); for NTSC, it is 704 pixels by 480 pixels (4 CIF), 528 pixels by 320 pixels (D CIF), 704 pixels by 240 pixels (2 CIF), 352 pixels by 240 pixels (CIF), 176 pixels by 120 pixels (QCIF). Frame rate is 1/16 to 25 frames per second (PAL), and 1/16 to 30 frames per second (NTSC). It also has one RJ45 10M/100M UTP network, one RJ45 RS-232 and one RJ45 RS-485 port for communication. It works in humidity levels from 10 percent to 90 percent.


Finally, Hikvision's DS-6101HFI-SD DVS with embedded Linux OS features one channel of H.264 video compression, one channel of audio compression and 4 CIF (real time). It offers TI DaVinci hardware compression, which supports 4 CIF, DCIF, 2 CIF, CIF and QCIF real-time compression, dual-compression streams at CIF and QCIF resolution, ,motion detection, and variable bit and frame rate. It offers TCP, UTP, RTP, Multicast, DHCP, PPPoE and HTTP. It comes with watermarking, PTZ control, and sensor alarm input and relay output. Motion, sensor and other events can be sent to a remote host center. Other functions are network voice talk and local recording with SD card. It is compatible with current SDK and client software.

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