Basic knowledge of router
By Linky Johnson 2018-11-15 5349 0
As an electronic product required by every household, router has a huge market. Prices vary, too. Routers can cost tens of dollars to hundreds. It can be seen from the purchase classification that routers are generally divided into home routers, broadband routers, network security routers, enterprise routers, multi-service routers, mini routers, Internet bar routers and broadband router.
What you need to do before making a purchase is to identify your needs: home use. In addition to the most basic household needs, there are also some needs such as:
(1) Computers are mostly wired, and mobile devices are mostly wireless.
(2) I want to have a better wall penetration effect.
(3) It supports built-in functionality (wireless bridge, QSS, external storage, etc.), etc
The basic knowledge of routers
1. The gate of the internet world: interface
There will be a row of similar holes behind the router, which is the head of the crystal. The number of crystal heads is not unique, there may be 4, 6, or even 2. However, there are only two of these long, identical interfaces: WAN port and the LAN port are distinguished by color.
The wan port can be understood as a water tank master valve connected to the outside of the home.
There are three kinds of broadband access: Modem, Optical Modem, and Internet lines. The WAN port is for these things.
(1) Modem: it will make a network cable and plug the other end of the cable into the wan port
(2) Optical Modem: The telephone line has become a fibre-optic fiber.
(3) If the wire goes to the home, you can plug it directly into the WAN port of the router.
2. Source of Wi-Fi antenna
The antenna is actually a wire that emits and receives signals.
Some people like to buy routers with "a large number of antennas". They think that the signal will be better and the Internet will be faster.
Some people like the router with "a small number of antennas" and think that the radiation will be smaller.
The signal intensity of wireless network is not related to the number of antennas.
What's with all these antennas? So what depends on the intensity of the signal?
When both transmitter and receiver devices support MIMO (multiple-input multiple-output,) and have multiple antennas, the number of antennas affects the wireless rate at the same position.
The decisive factor of the signal quality of wireless router is the transmitting power of wireless router. Countries have regulations on the transmitting power of wireless routers, generally not more than 100 MW, that is, 20dBm (2.4 GHz band). So we can see that according to the national standard, the signal intensity of the transmitter is fixed. No matter how many antennas, its transmit power will not change; also will not affect the wireless signal coverage.
What really affects the signal strength is the hardware configuration of the router (radio frequency chip and wireless power amplifier), the location of the router, the structure of the house, the gain of the antenna, the wireless network card, and so on.
Network approach: telecom operator-optical modem-Router-computer network card. Every connection will have an interface; everything to interface there must be bandwidth. In simple terms, with 200 M broadband, computers may not be able to enjoy 200 M network speed. Bandwidth is divided into 10 Mbps 100 Mbps (100MB) and 1Gbps (Gigabit). If the bandwidth is more than 100 M, all the interfaces of the network card and router must be gigabit, otherwise there is only one hundred megabit bandwidth.
That is to say:
(1) Telecom operator: telecom provides 200m broadband services.
(2) Optical modem: The optical modem has to support gigabytes; otherwise it won't reach 200M.
(3) Router: The WAN port has to support gigabytes; otherwise it will not reach 200 M.
(4) Router: The LAN port has to support gigabytes; otherwise it will not reach 200 M.
(5) Computer network card: It must be a gigabit network card; otherwise it will not reach 200 M.
(6) Cable: Exchange to CAT5e, CAT6, otherwise it will not reach 200 M.
Any of the above problems will directly affect the speed of the network.
4. Highway for data: 2.4 Ghz and 5 Ghz
The 2.4 GHz and 5 GHz I referred are not 3G and 5gg in mobile communications.
2.4 GHz is the most commonly used. Its characteristics are: better penetration, long transmission distance, poor load-carrying capacity.
5 GHz is advanced and gradually popularized. Its characteristics are poor penetration, close transmission distance and strong bearing capacity.
As the 2.4 GHz is common, the interference is more serious.However, 5GHz has some requirements for equipment terminals. If the old equipment does not support 5GHz, even if the router transmits 5GHz signal, the terminal cannot search for this hot spot.
5. The waste you can't see: Installation
Why it is a waste?
Because the antenna (whip) signal radiates 360 °, the position of the router is very important. In general, routers are best placed at the center of the required coverage to maximize the use of radiation radii. Wouldn't it be a waste if you put it in a remote place such as a window, which means that part of the coverage is outside?
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