What is PoE / PoC / PoH - Power Over Ethernet?
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.
PoE (Power Over Ethernet) - A technology for wired Ethernet local area networks (LANs) which passes electric power along with data on twisted pair Ethernet cabling. This allows a single cable to provide both data connection and electric power to devices such as wireless access points, IP cameras, and VoIP phones.
Example - A CCTV camera normally requires 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.
PoH (Power Over HDBaseT) - Power over HDBaseT (PoH) enables the transmission of DC power in conjunction with data signals over a single Ethernet cable to a distance of up to 100 meters/328 feet. The PoH standard is based on the IEEE 802.3at standard (Power of Ethernet – PoE).
PoC (Power Over Cable) - Works to similar principles as PoE and PoH (supplying simultaneous power and data signals over Cat cable) but is non-standardized 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.
What are the benefits of using PoE?
PoE has many benefits to an installation:
- Saves time - by not having to have electrical power cabling installed and not needing a qualified electrician to fit network cables, a person simply finds the right location for the device, installs the device and adds to the network via an Ethernet connection, saving both time and installation costs.
- Flexible - as it does not have to be attached to an electrical outlet, devices such as HDMI Extenders and wireless access points can be placed wherever they are needed most, and easily re-positioned anytime if required.
- Safe - Power over Ethernet usually uses 48V DC, which is classified as a safe voltage by the UL Standards. PoE also has built-in safety features, such as if there is an interruption in the connection, the PSE automatically stops sending power, and starts a handshaking process before sending power again. Meaning if there is damage to a cable, for example fraying, the power is stopped.
- Reliable - PoE power comes from a central and 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.
- Scalable - as it has power available on the network, this means that installation and distribution of network connections is simple and effective.
J-Tech Digital Support Team