Compare cases with mid-span and switch in POE deployment

What is the span of POE?

POE is known as MIDSPAN, which is known as "POE", POE, POE, POE, etc.

It can be used between ordinary switch and network terminal equipment to power network terminal equipment. In POE, there is a function of providing power to the network line, without the function of data exchange. The POE switch has the function of data exchange and power supply to the network line.

What is a POE switch

POE (POwer Over Ethernet) refers to the existing Ethernet Cat. 5 cabling infrastructure do not make any changes in circumstances, for some based on IP terminal (e.g., IP telephone, wireless LAN access point AP, webcams, etc.) to transmit data signals at the same time, also can provide such equipment with direct current (dc) technology. This is the switch that supports Ethernet power.

The POE switch port supports output power of 15.4W or 30W, which is in accordance with the IEEE802.3af/802.3at standard. The power supply of the standard POE terminals is provided by the power supply of the line, and the additional power wiring is removed. Comply with IEEE802.3 atPOE switches, port output power can reach 30 W, electrical equipment can be obtained by the power of 25.4 W. Popular said, POE switches is to support the cable power supply switches, it can not only realize data transmission function of the ordinary switch can also power supply for the network terminal.

POE (POwer Over Ethernet) refers to the existing Ethernet Cat. 5 cabling infrastructure do not make any changes in circumstances, for some based on IP terminal (e.g., IP telephone, wireless LAN access point AP, webcams, etc.) to transmit data signals at the same time, also can provide such equipment with technology of dc POwer supply. The POE technology can ensure the normal operation of the existing network while ensuring the safety of existing structured wiring, and minimize the cost.

There are two ways to deploy the latest high-power POE technology: by upgrading a network switch, or by installing midspan on an existing network infrastructure. The poe-capable switches with POE capabilities provide the advantages of an integrated solution, requiring only one cable to connect to the network. However, this is not necessarily the best option. Unless existing data network architectures are deficient, switching switches to increase capacity or performance need to be used for low power levels, and mid-span is a better choice for POE configurations. They provide a simplified configuration, management and maintenance portfolio, and excellent flexibility, reliability, security, and energy efficiency.

There is no need to change existing switches or cabling, and generally compatible with any Ethernet switch. As shown in figure 1, they can simply be added to existing switches and to the power device (PD).

By separating the power and data architectures, network deployment and flexibility are optimized. It can be independent of data needs to upgrade network power capacity, and vice versa. When a switch must be replaced, it can also be implemented through mid-span, without having to pay for both data and power.

It also has interlocking capabilities, which can provide higher port spacing than the POE switches might provide. When required, to 1, 4, 6, 12 or 24 incremental to configure POE. This contrast and installing a new switch, to this, the best practice is pointed out that the port of can be in as much as possible on POE configuration to support future growth. Figure 2 illustrates the separation of network power and data in a secure application.

This flexibility is particularly important when it comes to the cost of not being able to verify upgrades to the new poe-enabled switch. Their existing non-poe switches might only take a few years, or they might just need a few ports with POE capabilities. By including a gigabit interface, which further increases flexibility, they can more easily support high-power PTZ cameras and thin clients. Other options for enhanced flexibility include the ability to use DC input and external power to increase power capacity or redundancy, and to be able to power PD power flexibly from AC, DC, or another mid-span. Interconnection can also support the reliability of additional power equipment.


Once deployed, the mid-span POE infrastructure is also more secure and easier to manage and maintain. Security has been improved, because in the event of overload, short circuit or underload, midspan can detect and automatic disconnect the POE compatible (nOn - POE - cOmpliant) PD. The midspan also can provide remote power management capabilities, for unit scheduling, UPS power supply monitoring and based on the network (Web -based) monitoring. Both IPv4 and IPv4/6 addressing can be easily and effectively monitored, managed, controlled and reset electrical equipment.

Due to the increase of network size and complexity, the importance of remote power management is increased. Remote devices can be reset remotely, eliminating expensive service calls. Network administrators can focus on multi-site or multi-building installaTIOns, support instant alerts (such as E911) and respond when IP phone status changes. When integrated with the UPS system, the remote power opening/closing capability during the power failure also causes the lOw priOrity port to be disconnected. Remote power management must be implemented in a secure manner, so SNMPv3 management is recommended to prevent harmful agents from interfering with network operation.

Network-based power management is also one of many features that can provide improved energy efficiency over POE switches. During the day can choose a port for electricity or power, can reduce the power consumption as much as 70% through the use of the distributed power architecture and dynamic power management, midspan can further improve the energy efficiency, which makes them can provide power only when needed. One of the biggest energy USES is the big POE power supply, which consumes power even when not fully used. For example, a 48 port switch with each port 800W IEEE802.3af power may use only 20 ports at any given time. This wastes 80W static power. POE solves the problem by using a distributed power supply architecture, adding additional power or redundancy by adding smaller internal default and external power sources. This improves system efficiency because it can measure the power consumption of each device and take the initiative to reduce it only to meet real-time requirements. It also reduces cooling costs because smaller power supplies require only smaller and/or lower-speed fans.

Through good POE system configuration practice, it can also achieve better power efficiency. It can be used alone or combined with POE switches to power low power and high-power equipment to achieve the most energy-saving solution. For better power efficiency, can use two of four sets of power supply for 30 w power for power supply equipment, half and dissipation of power, and compared with the traditional two solutions, power consumption reduced almost 15%. Assuming that the energy cost of $0.10 per kilowatt-hour (KWH), which can be converted into each electric equipment to save about $25 per year.

By separating the power and data parts of the network infrastructure, it simplifies the network extension and upgrade. For a small amount of port increase upgrade, they provide more flexibility for the power infrastructure, they also contain high-power PTZ camera for needs one billion interfaces and thin client built-in support. Than the POE switches are available, and across usually improves the MTBF (mean TIme between failure, MTBF) level, they will come from the POE part and high sensitivity data part of high power dissipation is concentrated in a single enclosure. In addition, they provide improved security and reliability, and enable network administrators to remotely manage network power usage to achieve more convenience, cost savings, and energy efficiency.


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