One of the significant advantages of digital video surveillance systems over analog is power over Ethernet. In some cases, when a surveillance camera is installed in a hard-to-reach location, the possibility of using a PoE camera may even become crucial when choosing between analog and digital cameras.
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Technology itself power over Ethernet, and in an embodiment as hardware – penny. But since the main applications of PoE devices are IP phones in offices and video surveillance cameras, PoE equipment manufacturers are happy to charge double or triple the price of equipment that supports power over Ethernet. Of course, in serious large projects, where the cost of implementation is comparable to the cost of equipment, such trifles as the price of PoE-injectors, few people pay attention. More precisely, few people paid attention before. Now the situation has changed.
First of all, small customers were able to purchase 8-10-port PoE injectors on AliExpress. If you need to connect 10-20 surveillance cameras to a server powered by PoE, you can choose any type of switch you need, 100-Megabit or 1-Gigabit, install one or more PoE-injectors at the output of it at a cost of 60-70$, and get a fully working customizable infrastructure, much more flexible than in the case of using specialized switches for video surveillance.
If we are talking about a small object where it is necessary to install no more than 10 PoE devices, such as 2-3 IP cameras and 6-7 IP-phones, then you can buy board-like PoE injectors in the form of a ready Board. It only remains to pick up such a Board housing, power supply-and you got it. The cost of such solutions can be less than 40$ for 8 ports, and you will be surprised if you know how often these solutions are used in practice. And in any case the type of “ugly”, “unreliable” argument, the price will be and the answer like “2 years running 24×7 – no problems observed”.
Thus, if you choose devices to supply power to the Ethernet network, you will have 2 options. The first-certified, specialized inexplicably expensive equipment. The second-the Chinese, with almost no guarantee, often assembled on his knees. Both options will work for years 24×7 without causing any problems. On this question: and what in the middle?
Some manufacturers of network equipment can not pass by this “Golden mean”, which is literally empty and calls for “take me”. Their customers is those who want to buy a cheap factory product, with warranty and certificate. It is essential to have a device that is mounted in the rack, because only the device mounted in the rack will save the client from counting the cost of the switch separately and the cost of PoE injector separately.
Netis, a new name in the network equipment market, recently introduced the PoE family of video surveillance switches. Models from 8 to 24 ports, both 100-megabit and Gigabit, can be used in any installation – both in small offices and private homes, and in business centers.
The most affordable models SmB class series PE61xx. Let us dwell on them in more detail.
The youngest, Netis PE6108H (PE-6201), has 8 ports at 100 Mbps, of which 4 ports support PoE. To be honest, I do not understand in what cases this model can be useful. Four non-PoE port with a speed of 100 Mbps is a waste of money. Surely you have a Gigabit router above this switch, and it is a strange choice to pay for 4 PoE ports as a separate device.
This model has a Gigabit analog, Netis PE6108GH. It seems to be more interesting, but again, cameras that use Gigabit bandwidth are rare. And about a configuration of ports 4+4 we told above.
Much more interesting model Netis PE6108 (PE-6202), in which all 8 ports with a speed of 100 Mbit/s have PoE support. This is a device that can be recommended for small installations. Given that 1 of the switch ports you will have will work as Uplink, you can connect 7 devices. Gigabit version of this commutator, model PE6108G, we can recommend, if you are building the network “for ages!”, or it is extremely important for you to let Gigabit on any port, for example, if the switch will be used not only for surveillance cameras, but also for the General computer network.
The most interesting model from the initial class, looks 10-port 100-megabit Netis PE6110. This uses the 8 PoE + 2 Uplink port configuration. That is, to connect to a shared network, you do not use the PoE port.
Of course, we would like 2 Uplink ports to be able to be aggregated to connect to a Gigabit network at least at a speed of 200 Mbit/s, which will be very useful if you install modern 5-megapixel IP cameras, or 802.3 AC access points. But the manufacturer reminds us that after all, we are dealing with the lower price segment, and the aggregation of Uplink channels here and does not smell.
But the second 100-megabit port you can use for stacking of similar switches. Well, that is, by connecting 2 such devices and connecting to each other, you will already get 16 PoE ports. In principle, if your IP-cameras have their own motion detection algorithms, and do not clog the bandwidth to the server around the clock, and even stand in places where people do not really go, then this solution will not cause channel congestion to the server, and it may well be working.
Well, for application with IP phones where it is possible not to think of network capacity, it in General an ideal solution: wanted to establish additional workplaces, put the second same switch in a stack – and any problems.
Let’s take a closer look at Netis PE6110
About the design there is nothing special to say-a typical industrial design for mounting in a telecommunications rack. The size of 280х173х43 mm allows installation even in compact wall mounted cabinets. And mounting brackets-are included.
The switches have built-in power supplies, so they are connected to the UPS or PDU with regular cables. As expected, the food served in the back, and all the data port displayed on the front side. Network ports have built-in activity indicators, and in addition to the power indicator, no more information is displayed on the case.
If you decide to install the switch on the table, the legs will have to be glued to the body itself.
Examining Netis PE6110, miracles we don’t expect. Modern unmanaged switches, and even more so 100-megabit is 1 chip, which here is also closed by a massive radiator.
It is interesting that the power supply is not just put on a separate Board, but resembles a typical industrial PSU that is simply installed here without the top cover. The total power of PoE for 8 ports in this switch is 135 W, so passive cooling for such a power supply is more than enough.
By the way, with regards to power. Please note that the total power of PoE ports specified in the specifications is 135 W (48V, 2.8 A). At the same time, each port supports the IEEE 802.3 af standard, which provides power up to 25.5 watts. By simply multiplying, we get that the maximum load on the 8 ports of the switch exceeds its capacity by about 70% – 204 W against 135 W. In most typical situations, you can not think about this, since the devices that require PoE 802.3 af their maximum 25.5 W are very small. Usually it is the remote IR floodlights for cameras. Power consumption of cameras, IP phones and access points usually does not exceed 10 watts.
Price and conclusions
Of course, the main question that is raised when choosing a PoE device is the cost. What is cheaper to buy any network switch, the output of which will be installed PoE injector, or use a device type 2-in-1? Let’s do the math.
The retail price of Netis PE6110 is 90$. At the same time, we get 8 ports for PoE devices, 1 port for the internal network, and 1 port, as agreed – for stacking switches.
PoE injector for 8 ports, such as OSNOVO Midspan-8/PG, costs from 20 to 30$. However, without the ability to mount in the rack. The switch for 8 Fast Ethernet ports 100mbps with the ability to install in the rack, such as D-Link DES-1008D/K3 will cost about 20$. Thus, if the compactness of the rack installation is not critical for you, then a bundle of switch and PoE-injector for 8 ports will cost you about 3 times cheaper than Netis PE61110.
The switch for 8 Fast Ethernet ports 100mbps with the ability to install in the rack, such as D-Link DES-1008D/K3 will cost about 30$. Thus, if the compactness of the rack installation is not critical for you, then a bundle of switch and PoE-injector for 8 ports will cost you about 3 times cheaper than Netis PE61110.
However, if you need a switch for 8 PoE ports, and even with the ability to install in the rack, the choice is small. Weak HP OfficeConnect 1420 with a total capacity of 65 W will cost 280$. Most HP solutions are characterized by low power supply. The only competing product looks Pitec DT-PoE0908FM, value-105$.
Thus, in highly specialized cases, where the density of equipment placement in the rack and high power are important, Netis PE6110 looks quite competitive.
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