Hello, guys!
It is nice to meet you in the community!
Today I will share with you the PoE, including what is PoE, how to determine whether the device supports PoE, and how to calculate maximum number of the connected PoE devices.
What is PoE?
PoE, the full name is Power Over Ethernet.
PoE is a technology that provides DC power supply for terminals while transmits data signals without changing the existing Ethernet Cat.5 cabling infrastructure. In short, power is supplied through network cables, and no separate power cable is required.
The PoE power supply system consists of two types of devices:
Power supply device: a device that supplies power to other devices, such as a PoE switch or a PoE NVR800.
Powered device: a device that receives power, such as a PoE camera.
Standard of PoE, PoE+, and PoE++
Category | PoE | PoE+ | UPoE+(PoE++) |
Standard protocol | 802.3af | 802.3at | 802.3bt |
Power supply distance | 100m | 100m | 100m |
Maximum current | 350mA | 720mA | 960mA |
Input voltage of the powered terminal device | 36~57V DC | 42.5~57V DC | 42.5~57V DC |
Maximum power of a powered terminal device | 12.95W | 25.5W | 81.6W |
The NVR800 supports the EPoE compatible mode. The power supply can reach 200 m by reducing the network cable transmission efficiency (from 100 Mbit/s to 10 Mbit/s). In this scenario, only the bit rate lower than 1080p is supported.
Power supply mode
PoE power supply is available in two modes:
1236 transmits data and supplies power.
1236 transmits data and 4578 supplies power.
The actual power supply mode depends on the PoE switch. The two power supply modes are compatible with cameras that support PoE.
Category 5 cables are commonly used for data transmission. Category 6 cables are better than category 5 cables in terms of material, transmission performance, and stability.
How to check whether the camera supports PoE?
Query the datasheet
Log in to the HoloSens information platform, view the camera details page, choose Technical Specifications > General Specifications > Power Type, and check whether the item supports PoE.
Query the camera body
If the camera body contains the PoE parameter information, the PoE function is supported.
Does the NVR support PoE?
The following model support PoE: NVR800-A01-04P, NVR800-A02-08P, NVR800-A02-16P, and NVR800-B04-16P.
How many cameras can be connected to a switch?
Access Requirements
Power of a single network port > Camera power
Total PoE power > Total camera power.
This is what I want to share, thanks for reading!
