HiPoE housings for cameras.
Connecting devices using a minimum number of cables is the task that most consumers, installers and developers of electronic devices strive for. For example, at the moment, no one is surprised by connecting mobile electronic devices using a USB cable, which simultaneously transmits data (up to 400 Mbit/s theoretically) and a supply voltage of 5 V (up to 2.5 W).
Power over Ethernet, or PoE, technology allows you to transmit electrical energy along with data to a remote device via a standard twisted pair in an Ethernet network. This technology is intended for IP telephony, wireless network access points, network hubs and other devices to which it is undesirable or impossible to run a separate electrical cable. Also, at the moment, most stationary IP cameras already support this standard.
The IEEE 802.3af-2003 standard provides a nominal 48 VDC (minimum 44 VDC, maximum 57 VDC) over two pairs of conductors in a four-pair (category 5) cable, with a maximum current of 350 mA to provide a maximum power of 12.95 watts.
The new IEEE 802.3at-2009 PoE standard, called «PoE+» or sometimes HiPoE, (adopted September 11, 2009), provides up to 25.5 watts of power. Several manufacturers have already announced products that claim to support the 802.3at standard and provide up to 51 watts of power over a single standard Category 5 UTP cable using all 4 pairs to transmit power.
To achieve the new format, the following 3 conditions must be met:
— increase in maximum current from 350 mA to 600 mA;
— increase in minimum line voltage from 44 V to 50 V;
— decrease in total line resistance from 20 Ohm (Category 3 cable) to 12.5 Ohm (Category 5).
For the vast majority of stationary outdoor IP cameras, the 12.95W provided by the standard PopE 802.3af is sufficient. Compact outdoor cameras powered by PoE are not capable of operating in outdoor conditions at temperatures below -20°C.
If you need to install a stationary IP camera outdoors, at least an additional 10-15W of power is required to power the heating element of the thermal housing. This problem can be easily solved by connecting an additional power cable to the housing with almost unlimited power supply capabilities. But then all the advantages of the PoE standard are lost — data and power transmission via one cable.
The new PoE+ 802.3at standard was developed specifically for devices that go beyond PoE. It allows for the necessary power (up to 25.5 W) to be provided on an outdoor camera, and with special network switches and network injectors – up to 30 – 51 W.
To provide power to both the IP camera and the heater, a special device is installed in the casing that divides the supplied power into 2 streams: the first supplies the camera with power according to the PoE 802.3af standard, the second is supplied to the heater/fan as needed.
This topology for building an IP video surveillance network imposes specific requirements on the following elements:
— a network switch or high-power injector. For example, a 16-port network switch with HiPoE support must provide up to 500 W at a load;
— the cable from the switch to the camera must be of high quality and without intermediate connections;
— the housing must be equipped with a built-in power supply divider. Moreover, the camera must be powered according to the PoE 802.3af standard.
As a result, the advantages of such a connection are as follows:
— flexibility of the ready-made solution. Allows you to install IP cameras without being tied to third-party power sources, which are often unavailable or expensive to connect; — low costs for installation and cable products;
— the ability to control the power supply of devices remotely. For example, some network switches allow you to remotely reset the power from a “frozen” IP camera.
AXIS T92A Housing (AXIS)
The housing provides protection for the camera outdoors and in harsh indoor conditions. Made of die-cast aluminum, the housing provides protection against dust and heavy rain.
Sun visor with built-in protection from side light provides good thermal insulation. It features a stylish design and easy installation, allows the network camera to operate at temperatures from -20 °C (-4 °F) to +50 °C (122 °F).
KIT6 Housing (Tekno System)
A housing designed for use with IP cameras: a special heater of our own design, a reinforced power supply, lightning protection for power circuits and Ethernet lines. The large internal volume prevents the camera from overheating in hot climates. For full integration with modern IT technologies, models with power supply for cameras and the housing according to the HiPoe standard are offered. The built-in power divider flexibly redistributes and regulates the amount of energy supplied to the camera and the housing, thereby ensuring stable operation of the camera in both cold and hot climates. The new HiPoe standard allows for the transmission of up to 30 W of energy via a standard Cat.5 cable, which will ensure the operation of the IP camera at an ambient temperature of +50°C to -50°C.
VERSO Hi-PoE (Videotec)
HiPoE technology allows you to power a heater and a network camera via Ethernet. Integrated HiPoE splitter, 24 W, 12 V DC. Cat. 5 cable. Compatible with HiPoE PowerDsine midspans. Made entirely of polycarbonate. Operating temperature: from -20 ° C to + 50 ° C. Side opening system, easy access to the camera.