What Is Data Transmission?
The data transmission means the transportation of any kind of information whatsoever, from one place to another by physical means. Historically, this was done by paper mail, a string of lights or semaphores, then with the help of Morse coder.
In computer terminology, this means sending streams of bits or bytes from one location to another location using technologies such as copper wire, fiber optics, lasers, radio, or infrared light. As examples include sending data from one device to another memory and access to a website, which involves the transfer of data from web servers to a user’s browser.
Email is a form of data transfer very popular because virtually free, but not secure. Its possibilities in terms of transmission / reception are limited to a few megabytes (usually up to 5 megabytes or exceptionally up to 10 Megabytes).
FTP software to match an Internet standard for transferring large files. This protocol is now able to accept a security such as SSL or TLS. Most FTP programs for clients have many options. They allow users to connect simultaneously to multiple recipients.
At each transfer, it is necessary for the sender to:
- Place the file on the FTP server. (Upload)
- Contact by mail or telephone the URL, the password and user name to the addressee
For the recipient to:
- Click on this URL
- Retrieve the file by entering the password and the user (Download)
For sender to:
- Remind the recipient
- Validate the receipt and integrity of the file
- Connect to the server again to delete the file to free disk space on the server
- Do not incorporate mechanisms for verification of non alterations.
- Do not handle the dematerialization and recovery CDs, DVDs.
- Lacking friendliness.
Currently the FTP software is used by 25% of companies for sending large files.
The mediators servers on the Internet
The principle is as follows:
- First step: The user drops files via a web interface.
- Second step: The recipient wishing to connect to retrieve information on the web server and retrieves the file.
This relational mode is a way today to transfer digital data over the Internet. The disadvantages are many:
- With regard to verification of non alteration, the same disadvantage remains that the FTP solution.
- In case of malfunction of the intermediate server, the user can not file its files.
- In case of congestion at the entrance to the server, the flow becomes too slow.
- The communication may be altered (if the cuts during the transmission are many).
- This technology does not support the dematerialization of media.
The method of using solutions-based midrange servers deposit files via Web is used at 10% by companies.
The concept of peer to peer Naxfer
The method Naxfer was made available recently for transferring small and large files (unlimited size, 100 Giga Bytes per instance), automating difficult tasks (compression, encryption, signature, issuance of a certificate, verification of perfection transmission, traceability, paperless system CD or DVD, etc.).
The email messengers
The method is relatively reliable courier, and has the advantage of not requiring specific knowledge of computers. The disadvantages are the length and cost. It is used by 65% of businesses and administrations to send large files or sensitive.
The transmitter transmits the clock signal and the information simultaneously on the same line, the frame transmission of information must be long enough.
To be continued…
Study: From Wikipedia, the free encyclopedia. The text is available under the Creative Commons.
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