Three Cores Medium Voltage Cable
Middle Voltage Electric Cable
Rated Voltage: 3.6/6kV to 26/35kV
Armour: Aluminum Wire Armored, Steel Tape Armored, Steel Wire Armored,
Certificates: Third party test reports
Applications: Those Medium Voltage Power Cables used for power networks,industrial plants, underground and in cable ducting.
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Standard: IEC 60502
What is the poe supply voltage?
**What is POE Power Supply**
POE, or Power over Ethernet, is a technology that allows network devices such as IP phones, wireless access points (APs), and security cameras to receive both data and power through a single Ethernet cable. This eliminates the need for separate power cables, making it a cost-effective and efficient solution. POE is also referred to as POL (Power Over LAN) or Active Ethernet. It enables the transmission of electrical power alongside data signals using standard Ethernet cabling, without requiring any modifications to existing infrastructure. The latest standards ensure compatibility with older systems while providing reliable power delivery.
**Characteristics**
One of the main advantages of POE is its ability to support existing network infrastructures without disruption. It reduces installation costs and enhances safety by eliminating the need for additional power outlets. The IEEE 802.3af standard was introduced as the first official specification for delivering power over Ethernet. It builds upon the Ethernet protocol to provide a standardized method of powering devices through network cables, making it widely adopted in various applications.
**Related Standards**
Initially, there were no formal standards for POE, leading to inconsistent implementations. However, the IEEE 802.3af standard (15.4W) became the first widely accepted POE standard. It was approved in 2003 and defined how power is delivered, detected, and controlled over Ethernet cables. This standard allowed devices like IP phones, surveillance cameras, and wireless access points to be powered through switches or midspan devices.
**IEEE 802.3at**
As demand for higher-powered devices increased, the IEEE introduced the 802.3at standard (25.5W) to support more power-hungry equipment. It is compatible with 802.3af but provides greater power capacity, enabling new applications such as high-performance surveillance systems and dual-band access points. This expansion helped push POE into more advanced and diverse use cases.
**Why is the POE Voltage Set at 48V?**
Many users are curious about why POE uses 48 volts. While it may seem arbitrary, this voltage level was chosen after careful consideration. The goal was to balance power delivery efficiency with safety and cable limitations. If the voltage were too low, such as 40V, the power transmission distance would be significantly reduced, limiting the practicality of POE. On the other hand, higher voltages like 60V could pose risks to the Ethernet cable and connected devices due to increased current and heat generation.
The 48V standard allows for sufficient power delivery while maintaining safe operating conditions. It also accounts for voltage fluctuations, allowing the supply to range between 44V and 57V. This flexibility ensures stable performance across different environments and device requirements. Ultimately, 48V represents a well-balanced choice that supports both functionality and safety in POE systems.