One source and two components of video surveillance

    Sigrand has expanded its line of equipment for organizing IP video surveillance with two new products: PoE LED-spotlight and PoE switch. Now, from one developer, a complete solution is offered in the form of a kit consisting of an IP camera with an additional spotlight up to 20 W and a PoE switch up to 60 W per channel.





    When designing an IP video surveillance system, the following tasks often arise:

    - Choosing a switch with the optimal number of ports for connecting a small number of IP cameras. On the market, low-port switches are represented by models with 4 and 8 ports and, as a rule, with a low total power.
    - IP cameras must be connected at a distance exceeding the range of the Ethernet segment to the nearest PoE switch. For this, intermediate equipment is installed in the form of additional switches or PoE extenders. Outside the premises, such a switch must be sealed or placed in a special cabinet.
    - The deployment of PoE switches is carried out over a large area with an excess of the range of the Ethernet segment to the nearest central switch. To do this, you need to select a switch that supports optical communication channel. There are inexpensive switches with SFP on the market, but without gigabit channel support, and support for two gigabit Combo ports is already inherent in expensive models.
    - The need to organize additional or backup backlight. For this, IP cameras with built-in illumination are used, which have low power LEDs, or additional spotlights are installed, for the supply of which a separate cable is usually laid.

    The developed equipment should help to solve all these problems both when organizing video surveillance on the street, and indoors.

    The set of equipment consists of a switch, an IP camera and a searchlight.

    The tasks set during the development:
    - Cover as much distance as possible when placing IP cameras using standard Ethernet technology
    - Connect as many IP cameras as possible to one switch
    - Ensure high quality night time shooting
    - To simplify the installation of equipment by reducing the number of wires
    - Do not use additional wires for powering IP cameras and spotlights
    - The switch must have the flexibility of settings, have a high power source and the ability to connect to the network through copper and optics
    By the time the switch and the floodlight begin to develop we already had in our assortment IP cameras of standard and sealed design with a built-in switch for 2 Ethernet ports, through which you can organize a serial connection Multiple IP Cameras The Ethernet ports on the IP camera support PoE pass-through, which we called Pass-Through PoE.



    To provide transit power, PoE sources are used, which operate according to type “B” (for free pairs). In standard connection mode, the IP camera can operate from any PoE source. The power consumption of the IP camera is 4.5 watts.
    To implement chains of IP cameras using the maximum length of the Ethernet segment, the development of PoE sources with increased power was required. As the PoE switch, the SG-17S rack platform was used, in which the MS-17E8PP Ethernet modules are installed. These modules have 8 Ethernet ports, supporting PoE power up to 60 W per port, the type of power - in free pairs. The capacity of the switch, depending on the number of installed modules, is 8/16/24/32 ports, and the power on the ports can be adjusted programmatically. The chassis is equipped as standard with a power supply with an output of 240 W or can be connected to an external source with an output of up to 1 kW.
    Practical studies of operating modes with serial connection showed that using a standard Cat-5 cable, up to five IP cameras with hundred-meter segments can be connected. Simultaneous start-up of power supply for the entire chain on short cables is possible with 10 IP-cameras.



    For outdoor IP-cameras, the assortment includes special thermal housings with PoE power and an integrated searchlight - up to 10 watts. Thermocases have two pressure glands for the possibility of serial connection. Considering that the power consumption of a thermo-housing with a searchlight can be 15 W, the maximum number of devices in the chain is no more than 4, in practice this number, taking into account the length of the wires, is 2-3 pcs.
    With the advent of the IP-camera in the street sealed version of the SG-3C series, the need for an additional thermal cover has disappeared. IP cameras support a temperature range of -40 to +50 ° C.
    For example, SG-3C-1612: Network Interface 2xEthernet 10/100 PoE, Matrix: 1 / 2.8 "CMOS Sony IMX136 2 Mpix 120dB, H.264, MPEG4, MJPEG 1920x1080 30 fps, lens: 3 Mpixel, 2.8-12mm, motor zoom, auto focus, execution: street tight.



    The need for additional lighting remained relevant. When developing thermal housings with a searchlight, we were faced with the need to ensure good heat dissipation from LEDs. To ensure the temperature of the LEDs recommended by the Technical Specifications, the development of a special heat sink design, installation of additional fans and temperature control by a microprocessor with software protection in the form of power reduction at critical temperatures were required.
    It was considered impractical to use a low-power backlight (3 ... 5 W), which is used in most IP cameras with built-in backlight. Raising the backlight power without a special heat sink design is a risk of overheating of the IP camera. Therefore, it was decided to move the searchlight into a separate building. In this case, the spotlight must be able to receive power via PoE over the same communication line, which is supplied for the IP camera.
    The advantages of using a spotlight separately from the IP camera are quite obvious.
    - This allows you to organize a good heat sink and, due to this, use high power floodlights
    - Natural interference in the form of insects, rain and snow falling into the light of the floodlight does not worsen the shooting conditions, since this does not happen in front of the IP camera
    - Connecting several spotlights to the same camera allows you to highlight the scene from several points at once and increase the overall backlight power
    - Spotlights with visible backlighting allow you to provide the subject with additional light in dark places and video in color mode

    That's what happened in the end.
    The SG-1L-W1 is a PoE-powered LED floodlight with power control and an ambient light sensor. The model is made in the version with white backlight based on the diode assembly. In the future, the release of a searchlight with IR LEDs is possible. But visible illumination compared to infrared in combination with Sigrand IP cameras has one significant advantage - if the infrared illumination turns off the IR filter and switches to black and white mode, then when using a spotlight with white backlight, the image mode remains color. The transition to black and white mode is a separate setting.



    New floodlights are very easy to mount, as they do not require additional cabling. To connect them, you can use the existing data cable with PoE power supplied to IP cameras.
    Each spotlight is equipped with two Ethernet ports, through which both power and information signal are passed in transit. This allows the spotlights to be connected in series to a single PoE source. This chain can be completed by any PoE powered IP camera.



    When using Sigrand IP cameras, the connection sequence can be any. You can connect multiple spotlights to one camera or interlace IP cameras and spotlights.



    Depending on the number of connected spotlights and the type of PoE power supply, it is possible to adjust the power of the spotlight in the range from 5 to 20 watts. For automatic "on-off", the spotlight has a built-in light sensor. This provides additional energy savings and resource saving diodes.

    The main characteristics of the spotlight SG-1L-W1.
    Searchlight
    - Type of light source: LED assembly
    - Maximum power of LED backlight, W: 20
    - Color temperature, K: 5000-5500
    - Radiation (viewing angle), degrees: 120
    - Maximum light flux, Lm: 2000-2200
    - Turn-on threshold / backlight off, Lx: 20-30
    - Adjustable power values, W: 5, 10, 15, 20 (manual installation)
    Version
    - IP66, aluminum
    - Dimensions, mm: 180x80 (without mounting)
    - Mass, g: 950
    - Mounting: articulated, three degrees of freedom, eyeliner wire
    interfaces
    - 2-port Ethernet 10/100 with the PoE, the through-connection
    Power
    - PoE 48 volts (type B) with the ability to connect several devices

    in series. Planned retail price in the series: $ 100.

    The missing link for installing a street surveillance system was a small-capacity switch. The existing SG-17S switch does an excellent job of providing high power, but connecting a small number of IP cameras is often a redundant solution with at least 8 ports. In addition, the SG-17S has a number of advanced features inherent in high-priced devices. The switch supports Web, command line, or ssh management. Supports VLAN, routing, NAT, forwarding. In addition, the SG-17S chassis allows the installation of not only Ethernet modules, but can also act as DSLAM with support for SHDSL up to 15.2 Mbit / s in one pair.



    It required a simpler device with the minimum necessary set of management functions, but with the preservation of high power on the PoE ports.
    Such a device was a desktop managed 6-port switch with SFP support - SG-1S.



    The SG-1S switch is made in the desktop version in an aluminum housing. The front panel has 6 Ethernet 10/100 ports with PoE power and two combo ports 10/100 / 1000BASE-T / SFP. Power is supplied in free pairs in Passive PoE mode. It is possible to determine the presence of PoE load, so it is allowed to connect any Ethernet devices.
    The fan and the miniUSB console port are displayed on the rear panel.



    The built-in power supply has an output power of 250 W, which allows you to get high power on all PoE ports. Port power distribution can be done through a terminal connected to the miniUSB interface. In 4-port mode, you can configure the switch up to 60 watts per port, in 6-port mode up to 40 watts. This allows you to connect devices with increased consumption (PTZ cameras) or organize serial connections from multiple devices in Pass-Through PoE mode. Monitoring the status of ports allows you to find out the consumption of connected devices and the remaining power that can be used for free ports.



    Key Features SG-1S.
    Interfaces:
    - 2 combo ports 10/100 / 1000BASE-T / SFP
    - 6 ports 10 / 100BASE-T, Passive PoE + (up to 60 W in 4-port mode or up to 40 W in 6-port mode)
    - 1 miniUSB port (console)
    Execution:
    - Desktop
    - Dimensions: width 200 mm; height 60 mm; depth 112 mm
    - Weight: 1.3 kg
    Power:
    - 110-240V AC, frequency 50-60 Hz;

    Planned retail price in the series: $ 270.

    Result.
    As a result, we received a set of equipment that will minimize costs when installing a street video surveillance system. An additional option in the form of a searchlight will help to get a color, high-quality picture at any time of the day due to good illumination.



    For example, the SG-1S switch was involved in the “Safe Area” project in a Novosibirsk school. To connect 23 IP cameras, only one SG-1S switch was required (4 ports were involved). The number of IP cameras connected to different Ethernet ports was: 5, 5, 6, 7 pieces.

    Read more about the project and see the floor diagrams of connecting IP cameras here .

    Live broadcast from the SG-3C-1612 camera with the backlight SG-1L-W1 can be viewed here . The focal length of the lens is 2.8 mm; for the SONY IMX136 1 / 2.8 mm sensor, the horizontal angle is around 100 degrees.

    Immediate plans.
    The IP-camera of the SG-2C series is being prepared for release. This is a PTZ indoor IP PTZ camera, which, like previous models, will have two Ethernet PoE ports, a built-in microphone and speaker, optics of choice 2.8-12 or 6-22 with autofocus mode.
    The SG-18S universal switch is being prepared for release. The switch will have the capabilities of a switch and a router, as well as support the NVR function. The switch is made in 19 ”version, supports the installation of Ethernet modules on 8/16/24 ports, has a built-in power supply up to 1.5 kW and allows you to install a 3.5” HDD.

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