Solution WiFi Coverage dead end Gigabit Power Cat trial

In the WiFi network has been popular in the environment, there is a network equipment in the tenacious growth, this is the "Power cat."

PLC Power line communication technology, you can simply understand that the home is ubiquitous in the electric line as a network cable, the electrical outlet as the interface of communication technology.

The advantages of power line communication are obvious. Because of the 2.4G band wireless signal interference is serious, 5.8G band signal through the wall is weak, the family has a lot of places in the area of WiFi coverage or weak signal problems, serious impact on the Internet application experience. And for the room has been decorated, and then rewiring is not realistic, so the role of the power cat highlighted out.

PLC power line communication, including HomePlug, G.hn, HD-PLC and many other technical standards, the domestic flash-joint also has the relevant power line technology standards launched.

Recently Sohu it received a HomePlug AV2 standard based on the power of the cat. Here is a look at this product and its performance in the family networking.

Dismantling:

This Tenda power cat appearance is very small, because it is directly plugged into the use of electricity, in order to ensure safety, the product's shell uses the current popular ultrasonic plastic welding, the front and back shell of natural welding together. In dismantling, only use violence to pry open.

After the pry, the first layer circuit board is the power supply and the signal modulation part. This product's power supply has the function of lightning protection, at the same time according to the design code, high and low pressure part of the physical isolation.

This kind of power cat uses the Bo Tong BCM60333 chip scheme. Compared to previous generation standards, the frequency bands of the BCM60333 chips using the HomePlug AV2 standard use the 1.8mhz-86mhz frequency bands. At the same time, the introduction of multiple-input multiple-output (MIMO) technology, using a typical power outlet three wires (FireWire, 0 lines, ground), can be sent through different routes to send more data, transmission rate of up to 1.5Gbps. In the absence of ground wire, the device defaults to a single pair (SISO) mode with a transmission rate of 750Mbps.

Speed test:

For network equipment, stable, fast transmission speed is the most important indicator. In the test, Sohu it did not use the professional software to carry out the speed test, but by the power of the cat directly connected to two PCs of the gigabit network of data copies, to simulate the real user use scene.

Although the power cat can work directly without any setting, Tenda has designed a PC-side setup software for this product to be set up in advanced applications. This software can show the power of the cat handshake connection rate. The data shown from the software show that the handshake rate can reach around 800Mbps when two power cats are close to each other.

Although the handshake rate is high, but the implementation of the use, its stable transmission rate can only reach about 25mb/s, that is about 200Mbps. This rate is a little higher than the USB http://product.it.sohu.com/list/subcate_682_1.html2.0 u disk.

Bo Tong's engineers said that because the family's electromagnetic environment is very bad, at the same time, the power of the cat also need a portion of bandwidth for redundant error correction, it is difficult to achieve the nominal rate in the laboratory.

Electromagnetic interference of power line:

As we all know, our electromagnetic environment interference is very serious at present. After a period of trial, Sohu it found that access to the family's switching power supply to the power of the cat signal stability has a live impact.

The current application of switching power supply is very common. Mobile phone charger, energy-saving lamp, induction cooker, notebook power adapter, TV power, etc., the universal use of switching power technology. Many low-cost power products for cost considerations, often as much as possible to simplify the circuit, its electromagnetic interference will seriously affect the normal operation of other electronic equipment.

The HomePlug AV2 Standard uses the 1.8mhz-86mhz band. The band covers HF and VHF low-end. Switching power supply frequency is generally in this band, so if the room has more switching power supply in the work, will affect the power of the cat signal stability.

It is noteworthy that the power of the cat itself will also have a certain impact on the frequency of radio communication. However, the power of the cat's work, will also detect the ambient radio signals, if the signal on a certain frequency strong, it will avoid this frequency, as far as possible to reduce the signal interference between each other.

After a period of trial, can be summed up the power of the cat has the following advantages:

1, fool-type Plug and play design. When used, there is no need for any additional settings, just plug in the network cable and plug the Power cat into the electrical outlet, you can automatically connect the network. Especially suitable for small white users.

2, the cable power cat can be guaranteed in the application of large bandwidth (such as watching online video, download), keep the network high-speed and stability.

3. Low power design. After measured, this P1000 power cat, in the work of the power only about 2.5-3w, very save electricity, only equivalent to air-conditioning or TV standby power level.

4, isolation and security is high, the network only within the range of Home meter effective, exempt from other home rub the net possibility.

5, if the need to extend the wireless signal, only one end of the power of the cat access wireless router.

6, for IPTV set-top box, OTT set-top box, in the inability to directly use the network cable, the use of power cats can enhance signal stability, to avoid the attenuation of wireless signals affect the user experience.

Of course, there are some issues to be aware of when using:

1, sockets, especially lightning protection and other safety sockets, will affect the speed of the Internet.

2, the family if there is a measurement chip with the so-called "intelligent sockets" (equivalent to electricity meters), will greatly affect the speed and stability of the Internet back-end equipment.

3, inferior switching power supply, part of the air switch will affect the stability of the power cat.

4, air-conditioning, microwave ovens and other high-power equipment for the impact of the power cat is relatively small.

5, the power cat directly into the wall switch and position as far as possible away from other electrical equipment to reduce interference, can obtain higher speed and stability.

6, if the number of power cats is not enough, in the expansion, the need to use the same technical standards of the electric cat to ensure the Internet experience. Because HomePlug AV2 standard backward compatibility, can also choose the older standard HomePlug specification power cat. At present, several major technical standard branches of PLC are incompatible.

7, the power of cats in China is far from universal. Such a situation also leads to exorbitant prices for such devices.