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Poe switch

Video surveillance, Wi-Fi, and even cash register: our portfolio has projects under which not one hundred of our PoE switches have been purchased. We want to tell you about the use of PoE equipment, some nuances in its selection - namely, the delicious we have, of course, at the end.

First a few words about the technology and standards.

A few words about PoE

PoE (Power over Ethernet) allows the transmission of electrical energy to a remote device connected to the network via Ethernet / Fast Ethernet / Gigabit Ethernet. Energy is transferred via the same Ush (Unshielded Twisted Pair) UTP cable.

The main advantage of PoE is to reduce infrastructure costs. Of course, higher-cost feeders (CAPEX) are expensive, but investment will pay off quickly during implementation and in-service (OPEX), especially considering all the associated costs. For example, you cannot ignore the cost of pulling a power cable and installing additional sockets when using a traditional power scheme. In addition, this approach increases the aesthetic component.

The second advantage is the convenience of using end equipment fed through a single data cable.

PoE energy distribution enables centralized management of the power supply system, monitoring power consumption, and switching on / off customers, including automatically on a scheduled basis. The consequence of centralization will be to increase the reliability and controllability of the whole system as a whole. For example, a network management system used in an organization may collect SNMP power statistics.

Another advantage of using PoE is safety, as it provides intelligent energy transfer that protects the final equipment from overloading or lack of power.

The technology's flexibility allows you to place your live equipment anywhere without being connected to electrical grids.

Do not forget about the ease of installation and speed of network deployment. Fewer wired connections - shorter implementation time.

To date, two standards of twisted-pair energy transmission are widely used in home and corporate networks, as well as in networks of telecom operators: IEEE 802.3af-2003 and 802.3at-2009. The main difference between them is the maximum transmitted power. IEEE 802.3af-2003 standard delivers power up to 15.4 watts (44 V and 350 mA minimum) across two pairs of conductors, while using IEEE 802.3at-2009 (also called PoE + or PoE plus) maximizes power to 25, 5 watts. Such huge capacity may be required, for example, when using CCTV cameras (rotary), or housed in specialized heated boxes.

IP phones with additional control / extension panels may also not fit into the standard 802.3af power budget. Not to mention the emerging on the market of small switches that themselves are capable of receiving power through PoE.

However, not all of this power is available to consumer devices. For example, when using the 802.3af standard at a distance of 100 meters, only 12.95 watts will be available to the final device due to the resistance of the wires and other losses.

successful projects

Many corporate customers want to know the answers to a number of questions before purchasing a vendor equipment. Have the implementation been successful? What equipment was used in what cases and why? How many devices are used? What is the coverage area? We will give some examples of successful implementation of TP-Link equipment in the networks of some of our major customers, which were made in 2016/2017, as well as answer some of these questions.

video surveillance

The camcorder power task is one of the standard when using PoE switches. Our equipment is used by various retailers, including the X5 RETAIL GROUP. The group-owned Pietrochka supermarket chain has deployed a video surveillance system built on the AI-SF1208PL PoE switch. This model is intended for installation in a telecommunication rack, has 10 specific Fast Ethernet ports. The strengths of the switch include the built-in features of traffic protection and prioritization. Initially, Pyaterochka began to build infrastructure with competitor's 16-port switches, but then turned our attention to our similarly priced 10-port models, which ultimately helped the company save significantly with more connected cameras.



PoE technology in this project was also used to provide power to some access points and VoIP phones. And other equipment (servers, printers, network security devices) was connected using standard Gigabit Ethernet interfaces. In total, around 2,000 of our switchgears have been installed in the supermarket chains.

Another major federal home and dacha network has also built its video surveillance system based on the T1500-28PCT model: a 180-watt energy budget is perfectly suited to their requirements. Typical indoor CCTV cameras are of the second class of devices in terms of the IEEE 802.3af standard and fit into the power consumption range of 3.8 to 6.5 watts. Their CCTV system utilized internal rotatable camera models (without servos and heated enclosures), which allowed them to be powered even with the highest switching energy budget.

We have another example of the successful scale-up of our PoE switches. In this case we are talking about the T2600G-28MPS, which has up to 384 watts of power for 24 Gigabit PoE ports. On the basis of this switch (together with TRASSIR) the system of video surveillance in the network of family hypermarkets was deployed (all for the construction of a large-scale system of video surveillance the customer needed about 750 switches with PoE + support).

CCTV on the YED

One of the use cases was the organization of CCTV during 2019. For this purpose, we have provided T1600G-28PS switches: 24 gigabit PoE + ports with 802.3at / af support and a 192W energy budget. Choosing the T1600G instead of the T1500 fell through gigabit ports, which were also owned by installed camcorders.

The difference between the T1600G-28PS and the T2600G-28MPS is that the former has a smaller power budget but is better in price.

Networks in universities

Generally, higher education networks are interested in their diversity. Here we would like to point out projects in two major educational institutions of our country. In both cases, T2600G-28MPS switches (TL-SG3424P) with a large energy budget (up to 390 watts) were used. These switches belong to the JetStream Level 2+ line and feature 24 copper Gigabit ports with PoE + 802.3at / af support, as well as four SFP slots. The maximum speed of the device is 56 Gbps or 41.7 million packets per second. The T2600G-28MPS can be installed in a 19 "telecommunication rack or placed on a desk or shelf.

In the first case, a large-scale video surveillance system was deployed, the technical task of which required the installation of switches with an energy budget of at least 380 watts. Also in this case, it was necessary to ensure security already at the level of access to the network. Both of these conditions determined the choice of model.

In another school, T2600G-28MPS switches were used to organize a wired segment that supports wireless Wi-Fi. This model was chosen because the power consumption of access points is well above standard IP cameras.

The wireless features have been assigned to the TP-Link AC500 controller and CAP1750 hotspots, which we've discussed in detail in our blog post earlier.

Examples of building small networks

Of course, compact models with PoE, designed to work outside specialized servers, are also successful. For example, the fanless TL-SG108PE. This switch has eight gigabit ports, four of which provide power to connected equipment (up to 15.4 watts per port). The device's total PoE budget is 55W. These switches were used in the construction of local networks in the federal retail network of shoe salons and another popular pharmacy network. In both cases, our PoE switches were used to power CCTV cameras and provide access points with electricity to create Wi-Fi networks, also built on TP-Link.

Tasty: from non-standard

We also have non-standard applications. One of the non-trivial projects was done jointly with CloudKassir. In July 2017, a law requiring online stores to make payments through cash desks and issue electronic checks came into force. Real-time tax sees business revenue, and the buyer always has a document confirming the transaction.

This is based on cash registers connected to the Internet. The seller can place such cash on his own, provide power, access to the global network and so on. But it can also use the service of specialized companies that provide cash desks for rent. We participated in the construction of one of these services. It is worth noting that the decision was built at a time of acute shortage of cash machines, which was due to some of the technical decisions made.

The TP-Link T1600G-52PS switches, which are mounted on a rack, are the basis of the network. This model not only performs traffic switching, but also provides the cashier with power. Unfortunately, the cashier models used did not support Power over Ethernet technology (and were not intended for rack mounting at all), so we had to supplement the structure with PoE splitters, which are housed together with online checkouts on dedicated sliding shelves mounted in a standard telecommunication rack.

The applied solution allowed to gain in the used space inside the rack (due to the lack of traditional power supplies), as well as to provide greater flexibility in managing the power system. The compactness of the solution in the future will save on the rental of racks and in general improve the efficiency of the IT-system of the customer.

The non-standard solution in this case is that PoE is used inside server rooms of the data center, where it is usually lacking in power, and the density of installation of the equipment is quite high.

In the dry residue

As we can see, PoE equipment is often used to organize large-scale CCTV systems and to provide wireless network access over large areas. And here everything is logical, but there is one point: in your practice, the choice of equipment of one or another production in Russian projects is often determined by the degree of involvement of the vendor in the project itself. And it's not just or not so much about warranties or support (on some models we have a limited lifetime warranty, in some cases we can offer free advance replacement), but about the flexibility of the manufacturer's approach to projects using his equipment.

For example, in a number of projects the main role in the selection of equipment was played by customization of the firmware of the devices. Also, the possibility of free pre-testing of the equipment does not go unnoticed. And the full-fledged radio frequency survey and planning, made at the stage of elaboration of projects, provided the choice of our wireless equipment in universities. In other words, we tried.

In conclusion, we would like to help you understand the model range of our switches and provide explanations for model numbering. For example, consider the T2600G-28MPS switch.

The digit after T indicates the control level: 1 - Smart, 2 - L2 / L2 + controlled switch, 3 - the third level switch.

For managed switches, the second digit in the model name indicates the base set of firmware features and the hardware platform: 5 - standard L2 functions, 6 - support for static routing, 7 - the presence of 10 Gigabit Ethernet interfaces or support for physical stacking.

The letter after the digits indicates the main port speeds: G - Gigabit Ethernet, X - 10 Gigabit Ethernet, the absence of an indication indicates that the switch interfaces support Fast Ethernet.

The total number of ports is encoded in the second digit group.

The last set of letters is used to indicate the type of interfaces and other hardware characteristics: T - UTP ports, P - switch with PoE support, MP - switch with increased energy budget, S - independent SFP Uplink ports and so on.

From the above, it turns out that the T2600G-28MPS is a L2 / L2 + controlled TP-Link switch with static routing support and an increased energy budget, with 28 1Gbps ports and independent Uplink - interfaces intended for installation of SFP.