Power-over Ethernet (PoE), Power-over-Cable (PoC) and now Power-over-HDBaseT (PoH) are all based on the same basic principle of simultaneously providing both data signal and power from one device to another over the same cable.
HowToAV takes a look at how each one differs and the benefits of PoE powered devices...
Power-over-Ethernet (often referred to as PoE) is a technology which provides electrical power over standard Ethernet cables - in most cases providing the power delivery simultaneously with the data signals sent from one device to another.
As an example, a CCTV camera would normally require both data cable and an external power supply - from two separate cables.
However, a PoE enabled camera will receive both data and power over the same network cable from a network / PoE switch or from the system's NVR.
PoE (Power-over-Ethernet) is an electrical industry standard which allows electrical power to be transmitted simultaneously with data signals over Cat5e/6/7 cable.
PoE is standardised to adhere to specific voltage ranges between 37 and 57 volts. This ensures that any PoE device connected to a system receives a compatible power supply.
Power over Ethernet will only apply power to the line once a remote device / receiver has been detected on the line.
PoC* (Power-over-Cable) works to similar principles (supplying simultaneous power and data signals over Cat cable) but is non-standardised and is applied to proprietary systems.
Therefore, the voltage supply can be set to meet the needs of a specific product/system (which may be lower or higher than voltage range of PoE).
Power over Cable will apply power to the line directly without detecting a device at the remote/receiver end.
*(PoC also sometimes refers to Power-over-Coaxial cable)
PoH (Power-over-HDBaseT); the latest Video-over-IP technology - HDBaseT - simultaneously transmits HD video, audio, control signals and power from device to device over Ethernet cable to distances of up to 100 metres.
Phantom Power - not usually considered within the PoE / PoC 'family', but Phantom Power sends a 12-48 volt DC voltage along with the audio signal form an amplifier for use with condenser microphones.
As technology moves us further and further into the internet of things (smart devices and IP connectivity), the range of products and equipment that is powered via PoE continues to increase. For example, PoE devices include:
CIE is a multi-award winning distributor of professional audio visual and security equipment. As well as supplying audio equipment to the UK installation sector, our dedicated systems architecture team design, specify and build many of the UK's blue-chip and most complex AV and access control systems for our installer customers.
If you would like help with design, specification or rack build for your next audio video or access project, then please call the CIE team on T. 0115 9770075 or email firstname.lastname@example.org
HowToAV.tv provides a whole host of tips, tricks and technology know-how for the professional audio visual industry.
Subscribe to our YouTube channel now at howtoav.tv for all the latest video casts or send us your questions to email@example.com