Concise definitions on frequent terms

Automatic Document Feeder (ADF)

  08/26/08 01:43, by admin, Categories: Imaging

An Automatic Document Feeder (ADF) is a mechanism that will automatically feed an original sheet of paper so that a printer can scan some amount of the paper at once.

Domain Name System (DNS)

  08/26/08 02:02, by admin, Categories: Networks

DNS is a system that stores information associated with domain names in a distributed database on networks such as the Internet.

For example, when you type in a domain name like, for example,, you computer will automatically query the Domain Name System to find the actual IP address of the server you are trying to reach, for instance:

You can see that query in more detail by opening a command window and typing in:

File Transfer Protocol (FTP)

  08/26/08 07:19, by admin, Categories: Networks

FTP is a protocol for transferring files over TCP/IP networks such as the Internet.

To transfer files, you need to connect to an FTP server with some FTP client software.

FTP can be used to transfer very large files, especially files that are too large to be sent via email. However, the need for a server to exchange files with someone else makes this less practical than email.

FTP is also commonly used to upload web pages and web applications to web sites. Most web servers also feature an FTP server.

Some commonly use FTP clients are:

  • Windows: FileZilla
  • Mac: CyberDuck, Transmit
  • Unix: ftp command

Lightweight Directory Acess Protocol (LDAP)

  10/03/09 21:16, by sandeepbk, Categories: Networks

Lightweight Directory Access Protocol (LDAP) is an networking protocol for querying and modifying directory services running over TCP/IP.

Is is often use to verify a login/username against a central directory to allow/reject login and then maybe obtain more detailed information on the user (firstname, lastname, etc.)

Comma Separated Values (CSV)

  08/26/08 01:56, by admin, Categories: Uncategorized

File format used to exchange data between disparate applications. The file format, originally
introduced by Microsoft Excel, has become a de facto standard throughout the industry, even among non-Microsoft platforms.

Dual Inline Memory Module (DIMM)

  08/26/08 02:01, by admin, Categories: Uncategorized

A small circuit board that holds memory.


  12/06/13 19:07, by admin, Categories: Networks

A modulator-demodulator is a device used to transmit digital data over an analog channel. It modulates/demodulates a carrier signal in order to encode digital information onto it.

A modem is typically used to transmit computer data over POTS phone lines.

Fuser Unit

  08/26/08 07:20, by admin, Categories: Networks

The part of a laser printer that melts the toner onto the print media. It consists of a hot roller and a back-up roller. After toner is transferred onto the paper, the fuser unit applies heat and pressure to ensure that the toner stays on the paper permanently.

This is why paper is warm when it comes out of a laser printer.


  10/03/09 20:27, by sandeepbk, Categories: Networks

An Intranet is a network using the same protocols of the public Internet but on a private scale, within an organization.

For example a company may have an intranet for sharing informations between employees. That information would not be accessible outside of the company.


  10/03/09 21:14, by sandeepbk, Categories: Imaging

The Joint Photographic Experts Group (JPEG) algorythm is a very commonly used method of compression for photographic images. It is also a file format used for storing or transmitting photos.

The JPEG algorythm is lossy which means some details of the original picture are lost when compressing the algorythm. The algorythm has a quality setting allowing to set a balance between smaller file size and better quality.

:: Next >>