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Feb 14

People commonly ask how far they can run Power over Ethernet. The answer is 100 meters from the PoE switch or hub to the PoE dependent device, regardless of where the power is injected. The limitation is not the power; it’s the Ethernet cabling standards that limit the total length of cabling to 100 meters.

There are however some devices that will allow PoE to be provided to a device over the 100m limitation.

Videplus’ PoE switches can provide PoE up the 250m which CCTV mode is turned on

The UNV range of NVR units can provide PoE up to 300m when Extended Transmission is enabled.  To enable Extended Transmission, open up the Main Menu, click Camera, select the camera you wish to enable Extended Transmission with, click Configure and finally Tick the Extended Transmission box and save.

Finally Videplus’ VP-EO2C-POE Single Port PoE Ethernet Extender is a high-speed Ethernet transmission device.  It can transmit Ethernet and Power signals together for PoE devices. It transmits data network signals up to 1000 metres over any pair of copper conductors, such as CAT5e, CAT6, coaxial cable.

Feb 14

Power over Ethernet (PoE) is a technology that lets network cables, such as CAT5e or CAT6, carry electrical power.

For example, a security camera would normally require two connections to be made when it is installed:

A network connection, in order to be able to communicate with a DVR and any display equipment.

A power connection, to provide electrical power the camera needs to operate.

However, if the camera is PoE-enabled, only the network connection needs to be made, as it will receive its electrical power from this cable as well.

Power over Ethernet reduces the number of cables required to connect a POE IP camera

Specifying Power over Ethernet brings many advantages to an installation:

Time and cost savings – by reducing the time and expense of having electrical power cabling installed.  Network cables do not require a qualified electrician to fit them, and can be located anywhere.

Flexibility – without being tethered to an electrical outlet, devices such as IP cameras and wireless access points can be located wherever they are needed most, and re-positioned easily if required.

Safety – PoE delivery is intelligent, and designed to protect network equipment from overload, under powering, or incorrect installation.

Reliability – PoE power comes from a central and universally compatible source, rather than a collection of distributed wall adapters.  It can be backed-up by an uninterruptible power supply, or controlled to easily disable or reset devices.

Scalability – having power available on the network means that installation and distribution of network connections is fast, simple and effective.

PoE has many applications such as:

VoIP phones – the original PoE application.  Using PoE means phones have a single connection to a wall socket, and can be remotely powered down, just like with older analogue systems.

IP cameras – PoE is now found throughout networked CCTV surveillance camera systems, where it enables fast deployment and easy re-positioning.

Wireless – Wifi & Bluetooth Access Points and RFID readers are commonly PoE compatible, to allow remote location away from AC outlets, and relocation following site surveys.

How to upgrade to PoE

Adding PoE to your network is straightforward, and there are two routes you can choose:

A PoE switch is a network switch that has Power over Ethernet injection built-in.  Simply connect other network devices to the switch as normal, and the switch will detect whether they are PoE-compatible and enable power automatically.

PoE switches are available to suit all applications, from low-cost unmanaged switches with a few ports, up to complex multi-port rack-mounted units with sophisticated management.

Adding Power over Ethernet using a POE Switch

A midspan (or PoE injector) is used to add PoE capability to regular non-PoE network links.  Midspans can be used to upgrade existing LAN installations to PoE, and provide a versatile solution where fewer PoE ports are required.  Upgrading each network connection to PoE is as simple as patching it through the midspan, and as with PoE switches, power injection is controlled and automatic.  Midspans are available as multi-port rack-mounted units or low-cost single-port PoE injectors.

 

Adding Power over Ethernet using a POE Midspan

 

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