Why DSL technology is faster than dial up internet

It is a kind of technology that has been relatively mature, and has been widely used in the connection of digital switches, high-bandwidth conferences, distance teaching, and mobile base station connections. The characteristics of this technology are: the use of two pairs of twisted pair transmission; It supports various rates of NX64Kbps, and the maximum port rate can be reached.

HDSL is a strong contender for T1 E1. Compared to the T1 E1, the DSL** is cheaper, easier to install, and has a relatively smaller number of amplifiers.

Using single pair twisted pair cables, multiple rates up to T1 E1 are supported, and users can choose the most economical and suitable rate according to the data traffic. In addition, it is worth saving a pair of copper wires compared to using HDSL, and the maximum transmission distance on twisted pair can reach more than 3 kilometers.

There are two types of uses for DSL: one is ADSL (Asymmetric Digital User Loop) for areas of internet access where fast speeds are required, but slower upload speeds are acceptable; There is also an SDSL (Symmetrical Digital User Loop) for short-distance network connections that require high upload speeds.

Unlike ISDN, which is also digital but needs to be transformed** over the network, DSL can provide "always-on" connectivity. At a telecom operator's office, DSL traffic is aggregated into a unit called a DSL Access Multichannel (DSLAM) and routed to the appropriate ISP and data network.

The Chinese name of DSL is digital subscriber line, which is a combination of transmission technology with ** line as the transmission medium. DSL technology supports symmetrical and asymmetric transmission modes on the user loop of the public network, which solves the "last mile" transmission bottleneck that often occurs between network service providers and end users. Since the DSL access solution does not need to modify the first line, it can make full use of the first user loop that can already be laid in large quantities, greatly reducing the additional overhead.

Therefore, the use of copper cable to provide higher speed Internet access is more popular with users, has been valued by all aspects, and has been widely used in some countries and regions.

DSLs include ADSL (Asymmetric Digital Subscriber Line), RADSL, HDSL, VDSL, and so on.

Shanghai Kuanban Jiahui Optoelectronic Technology is not ordinary garbage, Hengzhi wants to fire people, so he exerts internal pressure and makes excuses for himself, saying that it is because of other reasons that the other party resigned, this kind of garbage company, there are still people who buy his products. Product quality garbage, just sold Shen liquid out of 2 or 3 months to break down, not to mention, there are just to the customer on the hand of the broken, this kind of garbage company products, who buys who is unlucky. Not only that, in order to filter the negative news, Jiahui also called **, so that the post could not be searched on the homepage.

Hypocrisy at its core.

DSL, short for Digital Subscriber Line, is a technology that greatly increases the digital capacity of ordinary ** lines (local loops) that enter the home or office. The DSL speed is limited by the distance between the user and the ** office.

DSL is intended for two types of applications. Asymmetric DSL (ADSL) is used for Internet access that requires higher downlink speeds. Symmetric DSL (SDSL, HDSL, etc.) is designed for short-range connections that require two-way high-speed communication.

Broadband, such as ADSL, HDSL, etc., have different access speeds and uses.

At present, ordinary broadband is through the ** line to access the Internet, our non-strict sense of dial-up Internet access is such broadband, the general network speed varies, from 1m can be up to 8m, if it is a computer to choose 1m or 2m on the Internet.

For Broadband Internet Access (ADSL) users, the upload rate is up to 640kbit s, and the downlink rate is up to 8Mbit s

The highest downlink bandwidth of broadband using ** line is 8Mbps, and if you want to reach 20Mbps, you can only replace optical fiber access. Because ADSL technology uses frequency division multiplexing technology to divide the ordinary ** line into three relatively independent channels, upstream and downlink, so as to avoid mutual interference. Users can surf the Internet while playing, without worrying about the drop in Internet speed and call quality.

Theoretically, ADSL can provide up to 1 Mbps uplink and up to 8 Mbps downlink (what we commonly refer to as bandwidth) over a 5 km range on a pair of copper twisted pairs, providing both voice and data services.

They all belong to the category of DSL (Digital Subscriber Line), which is a combination of transmission technologies with copper ** wire as the transmission medium, including HDSL, SDSL, VDSL, ADSL and RADSL, etc., generally known as XDSL. The main differences between them are the difference in signal transmission speed and distance, and the difference in the symmetry of the uplink rate and downlink rate.

Let's focus on the differences:

ADSL: supports uplink rate 640kbps to 1Mbps and downlink rate from 1Mbps to 8Mbps on a pair of copper wires, and the effective transmission distance is within 3 5 kilometers.

VDSL: It is the fastest of the XDSL technologies, with a rate of 13 to 52Mbps for uplink data and up to Mbps for downlink data on a pair of copper twisted-pair cables, but the transmission distance of VDSL is only within a few hundred meters.

HDSL: Symmetrical transmission, effective transmission distance of 3 4 km, and requires two to four pairs of copper twisted-pair** cables, suitable for commercial environments.

In general, ADSL is suitable for home use, VDSL is fast, but the transmission distance is short, and the HDSL is symmetrical uplink and downlink, which is suitable for commercial use.

Don't use the graphical interface, use the command line, sudo pppoeconf, all the way to OK, enter the user name and password in the interface of entering the user name and password, and then click all the way to OK, and restart the system after returning to the terminal.

ADSL dial-up Internet access is a kind of DSL technology, the full name is Asymmetric Digital Subscriber Line, which can also be called asymmetric digital subscriber loop. It is a new way of data transfer.

The main features are:

1. A ** line can be answered at the same time, dialed ** and transmit data, and the two do not affect each other.

2. Although the original ** line is still used, the data transmitted by ADSL does not pass through the ** switch, so ADSL dial-up Internet access does not need to pay additional ** fees, which saves costs.

3. The data transmission rate of ADSL dial-up Internet is automatically adjusted according to the situation of the line, and it transmits data in a "best effort" way.

In the past, dial-up Internet access was in the 90s of the 20th century, when the Internet was just available, and one of the most common ways to use the Internet was dial-up Internet access. As long as the user has a personal computer, an external or built-in modem and a ** cable, and then apply for their own account with the local ISP ** provider, or buy a network card, have their own username and password, and then connect to the Internet by dialing the ISP's access number.

Now we want to connect to the Internet can find three network companies: Telecom, China Mobile, and China Unicom, and there will be special personnel to install them for you.

Peripheral dialing, routers and optical modems can be dialed.