The communication method "PLC" that did not spread in ordinary households, why it attracts attention again | Mynavi News Mynavi News Mynavi

HD PLC that connects a modem to an existing outlet to communicate

Wired LANs and wireless LANs (of course, PLC) have advantages and disadvantages.The wired LAN has a high -speed communication speed, but it is necessary to work on a LAN cable in the wall.When increasing the number of rooms that use wired LAN, wiring work occurs each time.On the other hand, wireless LAN is easy to introduce without wiring, but if there are obstacles such as walls and ceilings, radio waves tend to weaken (communication speed drops).

The advantage of HD PLC is that if you have an outlet, you can communicate in any room just by inserting a modem plug.Because it is wired communication, there is no problem with communication failure due to obstacles.In addition, there is a merit that the communication distance is long.The major feature is that using a multi -hop mechanism can earn a communication distance of 2 km or more.

The disadvantage of HD PLC that uses high -frequency bands is that it is easy to become a ragged and other rhinoceros.For this reason, PLCs have various regulations, and high -speed PLCs are basically used in closed networks such as home networks, buildings, and factories.

The biggest reason HD PLC did not spread for general housing was the slow communication speed.Both wired LAN and wireless LAN currently support the communication speed of several Gbps, whereas the communication speed of HD PLC is up to 30Mbps in theoretical value, and the effective value is up to 20Mbps.Internet communication data is increasing year by year, and the amount of data of content itself, such as photos and videos, has increased, so this communication speed is difficult.

Against this background, HD PLC's housing use has gradually decreased, and it is almost impossible to see it now.However, looking at the industrial field, there are many situations that do not need communication data so much, so there are many scenes that make it easy to take advantage of HD PLC.

HD PLC is particularly noticed in the industrial IoT field.With the gradual decrease in the working population, IoT is progressing in industrial fields such as factories and farms.In many industrial fields, the amount of data used in IoT is not so large, so the communication speed of HD PLC is sufficient.

In addition, the Radio Law, which was deregulated at the end of June 2021, enabled HD PLC on three -phase and three -line power lines mainly used in factories.Steel boats that have not been recognized so far can be used, and the range of use of HD PLC has expanded more than ever.

One company that has focused on PLC from the beginning is Panasonic.The current Panasonic Life Solutions has already introduced HD PLCs in various industrial fields.An easy -to -understand introduction example is existing facilities.For example, if you try to convert the operating factory with a wired LAN, the construction cost will be high.With HD PLC, existing outlets and power lines can be used, so the introduction costs can be greatly reduced.

With the above -mentioned multi -hop technology, the conventional method can be installed without a hub even at sites that require a hub every 100m.There is a great advantage in terms of cost in places where radio waves do not reach, such as in a long tunnel, or in a place where wired LAN is laid.

Panasonic introduced a student dormitory at Nagoya University.Nagoya University has increased remote lessons in the corona, but since it used to use VDSL by telephone line, there was a problem that the burden on the network was too high.

Therefore, we introduced HD PLC based on student requests to solve a sense of speed.With the introduction of a wired LAN, it takes about 3 months for a bid, about one month for construction, and about two weeks for optical cable, but HD PLC does not require wiring work.In addition, LTE and 5G Wi-Fi router may be considered for communication means that does not require construction, but this is a running cost of around 2,000 yen per room per room.

However, when HD PLC is installed in an apartment house, the problem is the communication speed.In the case of Nagoya University and Student Dormitory, 137 PLC adapters are installed in 137 units, but if the effective values of about 20 Mbps are divided in all houses, it will be a low -speed communication that cannot be used for online classes.Therefore, the communication speed is secured by restricting the number of units assigned by filter.

HD PLC is a communication method with issues, but as if it was deregulated by the law revision in June 2021, there is a possibility that situations that can be applied along with legislation will increase in the future.Currently, it is often used in limited environments, but in the future it may be more useful in familiar places.