PoE Switch Transmission Distance 150m or 250m
What is PoE
POE is an acronym for Power over Ethernet, it refers to without changing existing Ethernet Cat.5 cabling infrastructure, providing provide DC power to some IP-based terminals such as IP phones, WLAN access points, Ap while transmitting data signals, It is switches supporting Power over Ethernet; that is, Power over Ethernet.
In many cases, it is inconvenient or the cost too high to deploy the power supply and in consideration of improving the power supply safety, PoE is used to supply power to related equipment through Internet through the network cable.Usually, POE-powered devices include IP surveillance cameras, wireless APs, and IP phones. The power of the devices is different and may require different standard PoE devices. The most commonly used PoE standards are IEEE802.3af (15.4W) and IEEE802.3at (25.5W). Standard PoE switch transmission and power supply distance:As we all know, the Ethernet standard stipulates that the transmission distance is up to 100 meters. If it exceeds 100 meters, may result in data delay and packet loss. Because the signals are transmitted in the twisted pair, they interfere with each other and are also subject to external electromagnetic waves. At the same time parasitic capacitance and parasitic inductance between the wires lead to signal attenuation and distortion, the signal attenuation accumulated when the distance is too long to guarantee stable signal transmission. However, not all network cables are limited to 100 meters. In actual operation, with good quality cable such as oxygen-free copper Cat.5 network cable, or the Category 6 network cable can reach 120 meters This kind of cable can effectively reduce its own interference, and also avoid the interference caused by the series and the outside world. Therefore, the transmission is farther.CAT cable is the most common wire in market, but the quality is varied. To maximize the effectiveness of PoE, be sure to use a good quality cable.
There are 150m PoE, 250m PoE, and even with 500m switch in market while the standard state actual distance should control within 80m. what happens to this?
From above information, we come to know PoE distance is determined by the transmission distance of the data signal. The general CAT line data signal transmission distance is about 100 meters. In order to ensure the construction quality, the project generally takes 80-90 meters based on 100M maximum.
Many manufacturers claim that their POE switches can reach a transmission distance of 150 meters. However, in actual applications, to reach 150m, CAT6 types of lines with good quality or more superior quality cable must be used. Even ensure use the cable quality , but if the POE switch itself internal circuit uses a very common network switch chip and POE power management chip, it is impossible reach the network 100M and 150 meters. Even if barely worked out, the power consumption of the PoE power supply will increased, which leads to severe unstable network, packet loss, seriously attenuated the transmission bandwidth and unstable signals, and the PoE switch equipment fast aging to do maintenance work.
Can POE switch reach 250 meters?
As mentioned above, even a high-performance POE switch 100M can only reach 150 meters with full load and stable transmission. How to make 250 meters? In fact, If the rate or the transmission bandwidth is 10M. The transmission distance can be extended to 250 meters. This technology does not provide high bandwidth. The bandwidth is compressed from 100M to 10M, which is inconvenient for the high-definition monitoring images transmission.
When a POE switch transmits 250 meters, a switch is generally designed for the user to choose whether to use.Not all POE switches can easily transfer 250 meters as long as they are reduced to 10M bandwidth. This depends on the quality of the switch. If the switch’s internal switch chip is too poorly adaptive and the power chip management capability is not strong, even if 10M transmission is forced, It is also impossible to guarantee a stable transmission of 250 meters, even 150 meters.