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Sony VAIO Desktop User Guide
Glossary
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PBX
A PBX (Private Branch Exchange) is a private telephone network within an enterprise. Under
this system, the calls between the enterprise members are local and the phone numbers are
made up of 3 or 4 digits. Companies generally choose this phone system for internal
communication because it is less expensive than the regular network. The users can still
share a number of outside lines for making calls external to the PBX.
Pixel
A pixel (Picture Element) is a part of your screen. Your screen is made up of thousands of
pixels, enabling you to see colours and pictures on it. The more pixels, the higher the
resolution and the better the image quality.
Processor
The processor is the brains of the computer; it processes the instructions of your system’s
programs. The processor is also known as the CPU or microprocessor and can be found on
the motherboard (see this word) of your computer.
Product recovery CD-ROM
The product recovery CD-ROMs include the application recovery CD-ROM and the system
recovery CD-ROM(s)
PS/2
A type of mouse or keyboard port.
PSTN
PSTN (Public Switched Telephone Network) refers to the plain old telephone service, the
national telecommunication networks implementing voice transmission by using analog
signals.
RAM
Short for Random Access Memory, the memory used to run programs and store data in
current use. RAM is the fastest kind of memory to read from and write to. Information stored
in RAM is lost when you turn off the computer. The higher the RAM capacity, the faster your
current data can be processed.
Resolution
The degree of sharpness and clarity of an image. Resolution is expressed in pixels. Frequent
computer screen resolutions are 640 x 480 pixels (VGA resolution; appropriate for a 14-inch
screen), 800 x 600 (appropriate for a 15-inch screen), 1,024 by 768 (appropriate for a 17-inch
screen), and 1,280 by 1,024. LCD displays usually use a higher resolution than a CRT of the
same size.