What is the Internet access?

Internet access dialing is a type of connection that works using a standard telephone line. By launching a telephone line to a modem device on a computer and configurations to dial a specific phone number, the computer can connect to the Internet. This type of connection is usually cheap, but slow and may not be adequate to users using a website for multimedia and other applications with high bandwidth.

How does it work

This type of Internet access is offered through a number of Internet service providers (ISP). Most Internet service providers rent a set of telephone numbers - sometimes local, sometimes national - that allows the computer to send information to the network pipes that feed on the Internet. ISP customers usually pay an online access monthly or annual fee at any time of the day or night.

Before you can subscribe to dial -up services, you must have a computer and the right modem type. A modem is a device thatconverts digital data to signals that can be sent via a telephone line; Some models fit into the free slot inside the computer, while others are external and connect to a cable machine. The telephone line is connected to the modem to connect to the telephone system.

The modem is controlled by software on a computer that allows the user to set up an ISP profile that tells the modem what phone number to call and how to communicate with the service. As soon as the modem calls the phone number and guides the connection, the Handshake will be replaced, replacing the information between a computer mod and a remote server. The subscriber selects a user name and password or has an ISP assigned and this information is transmitted to the user to allow the user to join the service.

advantages

Dialing service is usually the least expensive type of Internet and May access either free of charge, though oftenwith the addition of advertising. It is also available to anyone who has a telephone line, so there is no need to add a separate connection to the house. Most computers already have modems installed, so there are often no additional hardware to start the service.

disadvantages

The biggest problem with the Internet is that it is slow. Due to the limited bandwidth, which is the ability of the modem to send and receive data, downloading large files can take a long time. Most dial services do not work faster than 56 kilobites per second (kbps); Downloading a file, which is a few megabytes (MB), would probably take several hours, which is too slow to stream video or music. Saving copies (called "cache storage") of often visited pages and other software tricks can in some cases speed up an experience, but most people who want access to many multimedia are likely to find unsatisfactory speed.

dial-up internet also depends on normal TeLefon line, which means the house must pay for a normal phone service to join. The phone cannot be used for any other purpose, such as voice calls, while the computer uses a line in most cases and usually interrupts any connection. In most situations, the user must dial the service every time he wants to connect to online, which means that the connection is not always on; It is also likely to be disconnected if the connection is not used for a period of time. In addition, only one computer can use the phone line at the same time.

alternative options

The most common, faster Internet options include cable and DSL (digital subscriber or reserved service line), although these alternatives may not be available in all areas. Like dialing, DSL uses a regular telephone line, but transfers data to digital frequency rather than a standard analog, so the Ainternet phone can be used simultaneously. Cable Internet service uses the sameNot lines that bring cable TV to the house. Both provide an Internet connection 24 hours a day, allowing subscribers to leave a computer actively connected to the Internet all the time. These services can be much faster than dialing, but can also be more expensive.

In some places, Internet users may have other connection options, including satellite, fixed wireless, integrated Digital Network (ISDN), rented lines and optics such as fibers such as fibers, FTTP. All these technologies are broadband, which means that they can transmit data of at least 1.5 megabits per second (MBPS). Unlike dialing, broadband connections are usually much better when downloading multimedia content.

Internet options and speeds

data transfer level dialý approach 56 to 64 kbps ISDN Basic Rate Interface to 128 kbps on the dual channel satellite 6 Mbps or higher dsl up to 8 Mbps for common DSL, but 250 Mbps for the most advanced standard (VDSL2). The speed is lower, the user is the user from the network hub. cable up to 20 Mbps, but usually less Fixed wireless wide -band connection 30 Mbps or higher but a clear line of supervision between access point and end user Lines: T1 and T3 1.5 Mbps and 45 Mbps FTTP up to 100 Mbps