When modem receives analog data through the connection, this tool will transform the data into digital data that can be used by the computer. Similarly, this tool will reverse the process when sending data (digital data to transform analog data).
Actually, the focus of this article is not to discuss the workings of a modem in detail but to discuss the types of modems.
Computer Internal Modem. Some computers have an internal modem that is built in modem or a computer modem card.
For computer modem card, PCI slot or sometimes the ISA slot is required, depending on the motherboard that interfaces available to receive the modem.
Internal Modems Computer with internet connection to use a dial-up through a pair of RJ-11 connection. Also known as the copper telephone wire, RJ-11 enables the computer to receive and send data as described above.
Internal computer modem is usually a 56K modem which means that the modem is capable of receiving data for 56 Kbits / second (56 kilobits, or 56,000 bits per second). Type of data transmission is called the downstream transmission, came from providers and transmitted via telephone lines. Generally the amount of data is a standard bandwidth for telephone cables.
However, because the Internet got a great two-way system, the data must also be sent from the client to the provider (server). For this purpose a computer can use a 56K V90 modem to send data in the upstream transmission of 33.6 Kbits / s. On the other hand, V 92 modem capable of sending 56 K 48 Kbits / s upstream transmission.
External Modem.
External modems can be used for the same purpose and in the same condition with internal modem. However, external modems are small boxes that use this type of interface to connect to another computer.
It could be a serial modem, so called because it was using a serial port for connection to a computer. Usually installed in the back of the computer, the serial port is an easy option for an external modem installed. The same small box, on the other hand, can be a normal USB modem uses the USB port is usually placed behind or in front of the computer.
The first of this type can be an external modem dial-up modem, but this type is more expensive than the internal type.
Just like other types of external modem you might consider two types of modems: cable modems and DSL, if you want a high-speed Internet services. All ISPs usually provide a special modem called a digital modem in a broadband package.
It is important to note that the cable modem must be connected with an Ethernet card, PCI slot is placed on a computer that is provided by broadband intenet connection to the user. It is true that if you select an Ethernet connection. However, you will not need it if your choice using a USB connection.
Cable modem. Cable modems use cable TV network axes to provide a great bandwitdth commuter than a dial-up modem. Access is really fast to the web provided by the cable modem with a downstream transmission up to 38 Mbits / s and upstream transmission up to 1 Mbits / s.
Unfortunately this transmission magnitude-fox change depending on the number of users due to bandwidth sharing using this cable technology.
Modem DSL (Digital Subscriber Line) is exclusive used for connections from the office telephone is transferred to the user. This technology, available and frequently used, separated into two main categories:
ADSLor Asymetric Digital Subscriber Line is commonly used in North America and supports downstream transmission from 1.5 Mbits / s up to 9 Mbits / s and upstream transmission up to 3 Mbits / s.
SDSL. SDSL or Digital Subscriber Line Symetric commonly used in Europe and has a downstream and upstream scale the same data that is about 128 Kbits / s.
One more thing
Modern modems have a few features that are very interesting that enables your computer to do essential tasks such as answering an incoming call automatically, voice mail, send and receive faxes .. and many more.
Do not waste your time! Enjoy the possibilities offered by different types of computer modem.
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