How many of the 13 deep pits powered by POE have you stepped on?

Hey! Brothers!

Those who work on network engineering, play surveillance, and tinker with wireless coverage, look at it! POE power supply is not fire now, but the pit is also a lot of people head big.

Don't panic, let's break it up and crush it today, and talk about the 13 hardcore questions about POE power supply that you absolutely can't avoid, and make sure your heart is clear after reading it!

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 What is POE? 01

Simple and crude: a network cable that can transmit data and power the device! IP phone, wireless AP, network camera these little brother, no longer need to find a separate power plug. The POE system has two protagonists:

Power Supply Equipment （ PSE ） : For example , switch , router with POE function , responsible for power supply .

Electric little brother （ PD ） : We monitor the circle , mainly is the network camera （ IPC ） it .

 Pick a POE exchange machine? Look at these points.02

The standard is different and the power supply capacity is very different:

· IEEE802.3af (PoE)： Maximum 15.4W （Actual availability of equipment is approximately 13.95W） ， Hey, hey, regular IPC's okay.

· IEEE802.3at (PoE+)： Maximum 30W （Actually, about 25.5W） ，High-power ball machine and high-end AP can also hold.

· IEEE802.3bt (PoE++)： More powerful , up to 90W + , for big guys （ such as certain LED lights , large screens ） .

How many boys can you feed? Look at the total power supply of the switch (W)!

A 24-port PoE switch , with a total power of 370W , according to the af standard （ 15.4W / port ） can feed 24 ports .

According to the at standard （30W / mouth） calculation？A maximum of 12 mouths can be fed （370W / 30W ≈ 12） .

Other necessities: How many mouths？Do you have a fiber port or not? Do you need network management features? Is it a gigabit, gigabit or tigabit speed?Choose according to the project

 POE is unstable 03

Technology itself leverage, the standard POE thief stable! Why does anyone feel unstable? Most of them were:

· Buy cheap POE switch or non-standard network cable （copper-clad aluminum, copper-clad iron？Save that money and wait and cry!） . 

· The scheme rolled back: the power supply was too long or too connected, especially at night when the cameras were heating, and the street was immediately short of electricity.

Conclusion: Monitoring project 24 hours a day, big data, high powerThe standard POE equipment + anaerobic copper wire is the way to go

 POE really saves electricity? 04

It has toGood standard POE switch （such as some MS series） , energy-saving brush:

· Power supply on demand:
Should the camera be heated when it's cold? The power goes up! I don't usually use that much? The power automatically decreases. Don't waste a drop of electricity!

· Periodic power outages:  Is it a holiday? Is it late at night? The settings automatically turn off power to the specified port, which is energy efficient and flexible.

· Port detective:
Is the device off line? Immediately stop the power supply, enter the energy-saving mode, save electricity and Ping An.  

 The greater the power, the better? 05

Now the power of ball machines and video terminals is up, and manufacturers are also trying to push high power POE exchange machine. But! Don't just look at the big total power figures and orgasm!

While the power is great, port density （how many devices can it carry） and cost are keyThe total power is 100W, but there are only 2 ports. What is the use?The price-to-performance ratio is terrible

First calculate how many devices you want to take, each device how much maximum power consumption, and then choose the total power and the number of ports are just good switch, the money spent on the blade!

 Where's the POE incense? 06

· Wiring saves crying:
A network cable solves data and power! Save the power line, save the labor and time to install the power supply, and the cost is reduced!

· Be safe and mindless:
Only if a compliant electrical appliance is detected does the network cable have electricity! Mixing old and new equipment is fine. The risk of a power leak is goodbye!

· Remote control 666:
Electricity can also be remotely controlledUse the SNMP protocol to implement midnight shutdown and remote restart operations, and the operation and maintenance are cool.

 Development Timeline 07

The old standard （ af ） is only 15.4W maximum , which is not enough for high-power ball cameras and IPCs with heating （ the at / bt standard alleviates this problem ） .

POE exchange machine a hanging, hanging below all the camera / AP collective attack street! The risk is so concentrated!

Compared to independent electric supply, standard POE equipment and post-maintenance costs are higher. On absolute stability, independent electric supply still has advantages.

 Is 100 meters a spell? 08

POE power supply itself a few hundred meters of direct current small meaning, why limit 100 meters? Because the data can't stand it! Over 100 meters, delay, packet loss came, the picture card into PPT who can bear?

· The IEEE standard is according to the anoxic copper wire （super five, six） measuredDomestic counterfeit / inferior wire （copper-clad steel / aluminum / iron） rampant, the resistance is like a wall, power supply loss is huge, 12.95W can not keepMonitoring project, network line money do not save

· Now some cattle X POE exchange machine, with a good network cable, can support to 250 meters or even farther! Technology is still advancing, and the future is ahead!  

 Buy a regular army or a rogue army? 09

PD device （camera / AP） input voltage is 48V？Select Standard POE Switch （IEEE 802.3af / at / bt） 。Is it 12V / 24V?Or find the corresponding non-standard POE switch, or use the standard POE switch + PD separator （separate the electricity and data in the network cable） 。

Cleft walls are recommended for standard ones! Why? The risks of non-standardization are too great:

· Simple and crude switching on power:
No POE chip for detection and protection, plug-in is 48。V （Or other voltage） , no matter what equipment is on the other side

· Burning you without consulting:
What if I connect the wrong device? Lightly, the port will be destroyed, and heavyly, smoke will ignite! The risk is too high!

· Standard POE is Smart Security:
First handshake （check for compliance）PD） ，Re-power supply, safety guaranteed

 Standard vs Non-Table POE 10

· Look at the parameters:
Output marked 12V / 24V？It's bound to fall short of the mark! Tag 48V? Don't worry. It could be.“Fake 48 V” （ In fact, switch-mode power supply straight out）.

· Multimeter law （ in the state of power supply ） :

1. Table pen puncture switch network port power supply foot （usually 1 / 2 + 3 / 6 or 4 / 5 + 7 / 8） .

2. Measured stable voltage （e.g. 48V、24V、12V） ？→ Non-standard!（It doesn't care who's on the other side, it just supplies power）

3. The voltage fluctuates between 2-10V / can't be measured？→ Standard POE （ It detects that the multimeter is not a legal PD and refuses to supply power ） 

 Is the standard POE reliable? 11

The reliability of the equipment, especially the POE power supply part, the power supply is the lifeblood! How can I tell if the power supply is reliable?

· The power supply must have a clear 3 C identification mark and manufacturer information! Are there no products? Direct Pass!

· Let the switch load for a while, touch the power supply shell。Hot （more than 50 ℃） ？This indicates poor heat dissipation, possible cutting of materials, and concerns about longevity and stability!Good power. Excellent thermostat.

· Power Supply Mark 48V 2A （≈96W） ，But the maximum power consumption is 120 / 240W?This kind of false label is serious, long-term overload, the risk of aircraft high

· Especially outdoors or in mined areas, it is important to have a basic mine-protected design for the power supply! Poor power supplies often ignore this.

Power supply is POE exchanger cost, choose reliable brand, avoid low quality goods! Project stability is the first, the shop visit rate is high, lightning strike bad one lesson is too painful!

 A POE exchanger

How many brothers can I bring with me? 12

Don't guess! The formula is simple:

POE total power supplied (W) / maximum power consumption per unit (W) = maximum theoretical support

Step 1: Check your POE switch's maximum POE output power （see the official website or the specification, not the power） 。For example, a 5-port POE switch has a total POE power of 57W.

Step 2 : Check your device （ IPC / AP ） Maximum power consumption （see official website parameters） 。Like some 3 million cameras, tagged,“Power Consumption: 5W MAX （When ICR switches 7W） ”。Take the maximum value of 7W.

Step 3: Calculate: 57W / 7W ≈ 8.14。Theoretically, eight.

Step 4 : Look at the actual number of POE ports on the switch : This one only has 4 POE ports , so it can only carry 4 .

Cable loss ？ Good switch （support eight core power supply, voltage slightly higher such as 51V） and good network cable （anoxic copper） can greatly reduce the loss。The loss of inferior network cable is large, and the number of equipment it can actually carry is reduced.

 Security Monitoring / Wireless Coverage

The Ultimate Guide to Choosing a POE Switch 13

Take four steps without getting lost:

· Must Select CriteriaPOE (IEEE 802.3af/at/bt) ！Safety and stability is the bottom line

· Count the number of camera paths, check the resolution / codec / frame rate, and use the bandwidth calculation tool at Haikang / Dahua websites to figure it out! Don't let bandwidth become a bottleneck!

· af vs at vs bt？Look at the maximum power consumption of your device! Is IPC AF enough? Ball machine / high-end AP selection at or even bt! Feeding is the key.

· 4 / 8 / 16 / 24? Combine the number of devices, location, total switch power and budget to choose the most suitable! Don't waste and don't use enough.

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