What are ADSL, LAN, optical fiber, and gigabit fiber?

Explanation of the noun m=mbps so 2m=2mbps 8m=8mbps

ADSL, in layman's terms, is the use of the city's ** network to connect to the Internet access method, what you call telecommunications 1M is ADSL. **The maximum speed is 8Mbps, because** cheap, no additional wiring is required, so the development is extremely extensive, but due to the increasing number of online resources now, the speed of 8Mbps is no longer enough, so a new way to access the Internet FTTb+LAN is derived, which is very likely to be the Unicom 2M optical fiber you are using now.

LAN is actually the meaning of LAN, then FTTb+LAN refers to optical fiber access to residential buildings (FTTB), and then distributed to every household in a building with LAN in the residential building, its advantage is that users do not need wiring or very little wiring, and the network speed is slightly faster than ADSL, and it is convenient to upgrade the next generation of broadband technology FTTH in the future. The disadvantage is very fatal, because it is a local area network allocation, so a fiber is shared by the residents of a building, if someone uses BT, P2P** software, then the bandwidth of the entire fiber will be eaten up, resulting in other people's network speed is extremely slow.

FTTH, this should be the optical fiber asked by lz, the full name is optical fiber into the home, that is, optical fiber directly into your home, to ensure that you use a fiber in your household, there is no problem of sharing, its advantage is that the rate is very fast, reaching the rate of 10Mbps 20Mbps. The disadvantage is that the optical fiber line needs to be re-laid and the optical network terminal is used, which is more expensive. So far, only major cities such as Shanghai in China have begun to carry out the transformation of FTTH fiber-to-the-home projects, with access bandwidths of 10M and 20M.

Gigabit optical fiber, that is, under the premise of optical fiber access, upgrade the operator's optical fiber equipment, and further improve our bandwidth, basically reaching the level of 1G (1000M), but this kind of technology is still far away for us for the time being, at least in the next 5 years.

You need to use a cat to switch the signal between digital and analog, so it's very bad.

Gigabit optical fiber, you can guess it when you hear the name, that is, large-capacity optical fiber transmission, with a capacity of up to 1000m, but it is generally used on the backbone, like a family enterprise is a waste of resources to use such a large one. So it doesn't make much sense.

LAN is a small local area network, and I'm not a good one, but it's just a little common sense.

Fiber optics themselves are gigabit indiscriminate.

The gigabit fiber we call in our life is actually the optical film block (that is, the optical fiber port).

First of all, single-mode optical cable is not divided into gigabit or 10 gigabit, single-mode wiring is gigabit rate or 10 gigabit mainly depends on the equipment it uses, under normal circumstances, single-mode optical cable through the support of equipment, working at 1550 m wavelength optical single-mode optical cable can support 10 gigabit (10Gbps) at least 60 kilometers.

Multimode fiber optic cables. According to the different transmission rates, it is divided into OM1, OM2, OM3, and OM4. The core diameter of OM1 is 50 m from OM2 to OM4.

The OM1 fiber optic cable supports gigabit distances of 300 and 550 meters at 850 m wavelength and 1300 m wavelength, respectively. It is also possible to support 10 mega at a distance of 100 meters.

Summary. Hello, 1. The classification difference between gigabit optical modules and 10 gigabit optical modules:

Gigabit optical modules include 1000Base SFP optical modules, BIDI SFP optical modules, CWDM SFP optical modules, DWDM SFP optical modules, SONET SDH SFP optical modules, and GBIC optical modules.

There are nine types of 10G SFP+ optical modules, BIDI SFP+ optical modules, CWDM SFP+ optical modules, DWDM SFP+ optical modules, 10G XFP optical modules, BIDI XFP optical modules, CWDM XFP optical modules, DWDM XFP optical modules, and 10G X2 optical modules.

2. The application difference between gigabit optical module and 10 gigabit optical module:

Gigabit transceivers are used in Gigabit Ethernet, dual-channel, and bidirectional synchronous optical networks (SONet), while Gigabit transceivers are used in Synchronous Optical Networks (SONET) with 10 Gigabit Ethernet, STM-64 and OC-192 rate standards, and 10G Fibre Channel.

Gigabit fiber and 100 Gigabit fiber how to distinguish.

Hello, first, the classification difference between gigabit optical modules and 10 gigabit optical modules: gigabit optical modules include 1000base SFP optical modules, BIDI SFP optical modules, CWDM SFP optical modules, DWDM SFP optical modules, SONET SDH SFP optical modules, and GBIC optical modules. There are nine types of 10G SFP+ optical blocking modules, BIDI SFP+ optical modules, CWDM SFP+ optical modules, DWDM SFP+ optical modules, 10G XFP optical modules, BIDI XFP optical modules, CWDM XFP optical modules, DWDM XFP optical modules, and 10G X2 optical modules.

2. The application difference between gigabit optical modules and 10 Gigabit optical modules: Gigabit optical modules are used in Gigabit Ethernet, dual-channel and bidirectional transmission synchronous optical fiber distribution network (SONET), while 10 Gigabit optical modules are used in 10 Gigabit Ethernet, STM-64 and OC-192 rate standard synchronous optical fiber networks (SONET) and 10G fiber channel.

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For 50M broadband, the common 150M, 300M, 450M and other routers on the market meet the requirements of use.

In order to adapt to future upgrades, it is recommended to choose a 300m or 450m router.

50m optical fiber can be routed with wireless routing of more than 150m (including 150m).

1. Ordinary home wireless routers generally support three modes: ,, and the latest mode.

Among them: the maximum bandwidth is 54M; The maximum bandwidth is 150M; The maximum bandwidth supports bandwidth up to. Only the routing dish supports two frequency bands:

and 5G. 2. The conversion formula for bandwidth is: number of bits per second 8 = bytes per second (actual bandwidth). Divide by 8 because of the number of 8 binary "bits.""= 1 byte, for example, the actual ** degree of broadband of 8m is 1m.

If the bandwidth is less than 8m, it is easy to understand by multiplying it by 1024. For example, 1M broadband is calculated in this way: 1 8*1024=128KB.

Multiply by 1024 and the unit changes from MB to KB.

3. The line bandwidth of the operator and the bandwidth of the router are calculated by the number of bits, so they must be converted into bytes. The broadband transmission speed of 50m is, and the transmission speed of the mode is: 50 8 = or so, so it is no problem to use any wireless route!

The transmission speed, 450m refers to 450m bytes per second, 300m refers to 300m bytes per second, 150m refers to 150m bytes per second, and the broadband network takes 10m broadband as an example, and the downlink speed is 1m bytes per second.

They all have the same ability to pass through walls. The coverage is the same, too!

What will make the difference is that the limit bandwidth is large. In fact, it is easy to understand that the attenuation degree of the concrete wall to the signal is the same percentage, such as 50%, but when the upper bandwidth is amplified, for example, the original 150m is now 450m, and the attenuation of 50% is the original 75m to the current 225m, and the passable bandwidth is still larger.

Gigabit fiber refers to its transmission medium, and gigabit network refers to the ISP information service provider of this Internet café can transmit up to 1000M, but the ISP information service provider cannot give you that high. Reasons for the slow internet speed:

One, you didn't give the ISP that much money.

Second, the bandwidth of a city is limited, and an Internet café cannot give you that high.

3. In order to ensure the Internet speed, the server of the Internet café will install corresponding software on the server to limit it, and one computer cannot affect the Internet speed of the entire Internet café.

Fourth, now Internet cafes are all light-to-Internet café servers, not light-to-desktop, that is, to your computer. The switches connected to the server may use super Category 5 or 6 twisted pair cables, but they are only a few hundred megabytes, and the 6th Category twisted pair can only reach 1000M with the support of the device. The switch to each computer uses ordinary twisted pairs, and the five types of twisted pair cables cannot reach the transmission speed of 1000m at all.

5. Even if your network can transmit 1000M, the server of the Internet café can't cope with it quickly, and you can't get through the server.

Optical fiber itself does not have a hundred megabits, megabytes, it is just a transmission medium, theoretically speaking, the bandwidth of optical fiber to transmit network signals, not to mention gigabits, 100,000 megabits is no problem.

No. There is a gigabit and 100 gigabit difference between a network card.

Routers also have a 100 Gigabit distinction.

Strictly speaking, these are two different conceptual categories.

However, from the conventional name, LAN broadband Internet access generally refers to the optical fiber + LAN mode, in which the switch line side is generally optical fiber, and the LAN port side is generally network cable, so it is called optical fiber + LAN, and sometimes it can also be called optical fiber Internet access. This method is generally the way used in new residential areas.

So if it's not strictly speaking, two fingers are the same thing.

I don't know what to do with this question, you don't understand the concept of LAN means local area network.

Broadband refers to the way to access the Internet.

Optical fiber refers to the transmission medium.

Most of the current community Internet access is that there is optical fiber access to the entire community, and then the first line access user, at the end of the first line, the terminal uses a signal splitter to separate the network data, and parses it through the modem (cat) to access the user's computer by the super 5 type network cable.

The user uses the broadband dial-up method on the computer, which is allocated by China Telecom (or other broadband operators such as Netcom), and logs in to the operator's computer room through the network cable-**line-optical fiber, and the operator's computer room gives your computer the permission to browse the Internet, and then you can "surf the Internet".

Broadband refers to the high transmission speed network access method, fiber optics is.

Transmission medium, not a concept.

It can be understood that fiber optics are the way to achieve broadband transmission.

One. It should be said that it is optical fiber and double glue wire, and the network cable at home is generally five types of double glue wire, and the transmission medium is generally copper.

Wire, the transmission of data is more like electricity, and optical fiber, which uses fiberglass, can be imagined as light in it.

specular reflection, so the speed is much faster than the double glue line, while.

The loss is smaller than that of the double glue line, but its ** is very expensive.

Oh, it's thick, but the core inside is about the same as a hair.

Many, and the installation is also more troublesome, two sections of fiber phase.

Even, you need to use a special fiber coupler, I know that.

That's it.,I hope it helps.,Hehe.。。

Today's broadband is basically divided into fiber access and ADSL access.

ADSL currently has a maximum transmission capacity of 10m, while fiber optics do not have this limitation.

Fiber optics and broadband are actually two different concepts.

Optical fibers transmit signals in the form of light pulses to glass.

or plexiglass, etc. as the network transmission medium. is a transmission.

The medium, like twisted pairs, thick cables, thin cables, etc., is just him.

The transmission speed is much faster than that of ordinary media and can be reached.

to more than gigabit per second.

And by broadband, we mean the speed at which we can access the Internet.

, the rate of dial-up Internet access has increased from .

56kbps, however, limited by the quality of the ** line, 56kbps should be the limit of the general modem. If you want to get faster Internet speeds, you have to cut the creek path, so in recent years, a variety of broadband access services have been introduced.

Appear. So, what is broadband? Actually, it's not very strict.

The definition is generally based on the upper limit of the current dial-up Internet speed.

56kbps is the demarcation, and access of 56kbps and below is called "narrowband", and access mode above it is classified as "wide".

Band". The most intuitive feeling is-

Broadband is the usual ** line is enough, optical fiber needs.

To go through the application procedures separately, it belongs to the special line to the Internet;

Optical fiber is a dedicated line and is more expensive.

Optical fiber is a dedicated line and has a fast speed.