Many friends are asking a question, which power supply is 1236 and 4578? This issue has also been discussed many times before, and we have already mentioned it before, so we will fully understand this knowledge today.
First, in the end which a transfer of data, which supply?
The standard poe switch has two standards, 802.11af and 802.11at. Both standard poe switches support two power modes:
11236 takes both data and power;
21236 to go data, 4578 power supply;
　 Second, what kind of power supply is actually used?
Which power supply method is actually used depends on the POE switch, which is compatible with our POE-capable cameras. Poe will judge which power supply method to use according to the situation.
Because of the 1, 2, 3, and 6 cores used in the 100-megabit communication, Gigabit uses all 8 cores. therefore:
1. For 100M PoE switches: the power supply standard network cable can be connected as long as 1, 2, 3, 6 cores, both data and power supply; of course, if you want 1236 to go data, 4578 power supply, then you must have 8-core network cable. And to ensure that all 8 cores are connected.
2. For Gigabit PoE switches: limited by the need of data transmission, no matter which way is available, all 8-core network cables need to be connected.
Third, what are the two standards of poe switches?
IEEE802.3af power supply is 15.4W. If the camera power is 10W, you can use 802.af power supply switch; IEEE802.3at power supply is 30W. If the camera power is 20W, 802.3at POE switch is required; 802.3at is It is compatible with 802.3af, so cameras that support 802.3af can be powered by 802.3af or at switches; cameras that support 802.3at can only be powered by 802.3at switches; for some high-power front-end devices, such as domes The output power is not up to standard and cannot be powered by the POE switch.
For example, the power of some domes is 40W. The maximum power of a single-port PoE is less than 30W. The power of the single port of the switch cannot be met. Therefore, you need to use the POE module that comes with the dome to supply power. I was sure when I bought it.
4. How far is the POE power supply?
For the poe power supply distance, there have been many friends in the weak VIP technology group who can discuss whether the poe power supply can exceed 100 meters. This problem is indeed affected by many factors. Some friends have no influence on the power supply of more than 100 meters, and some have experienced instability in the power supply of 90 meters. Let us discuss it together.
You must be sure to see the 200m, 250m, and 300m PoE power switch products in your circle of friends or online. There will be a doubt: the transmission distance of the cable is not 100 meters? What line is used to reach the propaganda distance?
Long-distance transmission over 100 meters must exceed 5 categories, and it is an 8-core cable. At the same time, the poe switch is powered by 8 cores, and the camera must also receive 8 cores. The key point is that the PoE switch device supports the network extension mode. When it is used, when the Super 5 and the Internet cable are used, the data transmission and power supply distance of the corresponding port can be up to 100 meters. For ordinary poe switches, we recommend that Within 100 meters is more suitable.
Why is it recommended to use a distance of less than 100 meters? Let's take a look at the resistance of various network cables.
Super five twisted pair cable of various materials 100 meters of resistance:
1. Copper clad steel cable: 75-100 Euro
2. Copper clad aluminum cable: 24-28 Euro
3. Copper clad silver network cable: 15 Euro
4. Copper clad copper cable: 42 Euro
5. Oxygen-free copper cable: 9.5 ohms
The shorter the distance, the smaller the resistance. The oxygen-free copper wire has the lowest resistance, so the power supply is the most stable. The distance resistance of 100 meters is only 9.5 ohms. If it is 50 meters? Then its resistance is 9.5 ohms and half, and the poe power supply loss is smaller (loss power formula, Q=I2Rt, the power loss is proportional to the resistance), then the power supply is more stable. Therefore, transmission over a distance of 100 meters, it is necessary to use a good network cable.
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