Consider what criteria to buy a switching hub

Since I was thinking that my LAN in my home is somewhat funny since last week, I was wondering if the LAN cable died, apparently due to the heat of the daySwitching hubIt seems that it passed away.

So, I tried to practice what criteria to choose when purchasing a switching hub to be used in a home LAN or the like. The following five points.

· VCCI class B
· Metallic aircraft
·temperature
· Power consumption
Number of ports

Even if you do not always have air conditioning inside the room, you can feel stable even when you choose which one you like, but it also feels like it's the same, but there are actually differences when you choose from the viewpoint like the above 5 points To do.

A detailed explanation of each point is as follows.
First of all on this breakdown. As a state, it continued to operate in the so-called thermal runaway condition, it seems that some ports were destroyed in a stroke. Although it is not impossible to communicate, the packet loss is too much and the transfer speed is lagging behind and it is not usable.

So, I tried to refer to the following page. This time we assume a home LAN of 100 Mbps.

Switching hub - wiki @ nothing

Roughly summarizing it was like this.

· VCCI class A is not available, choose VCCI class B
→ Difference in frequency generated. More than "VCCI class A"VCCI Class B"Standards are severe, so if you buy anything, you should choose" VCCI Class B ". If you look at the "Specification" page of each product, it is written. If it is "VCCI class B"Level at which television and radio are present within 10 m from electrical equipment and no noise of screen or sound appearsSo it is safe.

· Metal aircraft more reliable than natural
→ Durability problems and heat dissipation problems. The switching hub seldom turns off the power supply, and as a result it is a machine that assumes "keep on dissipating heat". Since plastic has a large coefficient of thermal expansion instead of light weight, there is a problem from the viewpoint of heat resistance. Also,Because the thermal conductivity is lower than that of metal, heat is not dispersed and it is easily overheated locallyis.

· Temperature can only withstand up to about 40 degrees for ordinary ones, but there are things that can withstand up to 50 degrees
→ This is also written on the specification page. If the room's room rises to 35 degrees, the interior of the machine usually exceeds 40 degrees. Moreover, if it is a room without air conditioning, it may reach up to 40 degrees only at room temperature. So, as long as it can withstand up to 50 degrees, it should be able to operate without any air conditioning even during general indoor use.

· Choose as little power as possible
→ Since it is a device that keeps the power on at all times basically, it is better to have as little power consumption as possible.

· The port needs to be larger than the required number
→ This is adjusted to each environment. It is better to be two more than the minimum number of ports required. Maybe I'll add NAS or something later. This time I made it for 8 ports.

That is why it got this way.

· VCCI class B
· Metallic aircraft
· Temperature up to 50 degrees
· Power consumption is as low as possible
· Number of ports is 8 ports

As a result of seeing each manufacturer's page under this condition, the remaining four candidates are as follows. All 8 ports are VCCI class B, yet metal. The remaining difference is temperature and power consumption. Let's see in order.

· "CG-SW08TXHG" Product Specification | KOREAKA Corporation
→ power 4.2 W, temperature 50 degrees

· Switch & Hub for home use | LSW-TX-8NS
→ power 5.0 W, temperature 45 degrees

· PLANEX: PRODUCT: HUB: 10 M / 100 M: FX - 08 IMW
→ electric power 6.6 W, temperature 40 degrees

・GH-EHS8MIN <コンパクトスイッチングHUB>
→Power 2.5 W, Temperature 50 °

That's why the last "GH-EHS 8 MIN"It turned out that both the power consumption and the temperature were quite excellent specs"Green House DirectI actually bought it. 3276 yen including tax free shipping. Although it is higher than other dealers, shipping is quick as there are only direct sales by manufacturers. We ordered on August 20 and shipped on 21st August, we arrived on 22th August.

This is the actual arrival box


contents


Body


When the LED display part is up, it looks like this


There are holes for exhaust on the left and right sides.


The port part on the back side


Rubber feet on the bottom look like this


Actually installed, it is going smoothly


As a result, it became stable even in an environment where the transfer speed in the network is not under cooling, and it became possible to operate files snappy over the network. It feels better than before it breaks, so it feels pretty good. Next time I want to build a 1000 Mbps environment soon, but since the laptop computer is 100 Mbps, it may be a painful thing if there is no point without starting from there.