The following glossary defines 290 terms related to the IT Industry.  
Please do not reproduce without permission.

OC-1, OC-3, OC-12, OC-24, OC-48

Optical Carrier transmission speeds, used in fiber optic networks conforming to SONET standard.  OC-1 is 51.85 Mbps.  Higher levels are multiples of that speed.

ODBC

(Open Database Connectivity) A standard allowing applications to access different databases in an uniform way.

Offline

The state of the device or computer when it is not connected to the local area network but mostly to the Internet (WLAN)

Online

Tha state of a computer when it is connected to the network and communicate with other machines.

Operating system

A software heart of the computer. It is a set of programs that manage the hardware resources of a computer, provide the environment for application programs to run and provide the user interface. Most known operating systems are: different flavors of Unix (SunOs, HP-UX, Irix, FreeBSD, Linux,Aix), MacOS and Microsoft Windows.

OSI

(Open System Interconnection). A network standard developed by ISO and CCITT. It describes the way in which protocols of different layers communicate. This enables machines of different vendors to communicate over the network.