Operating instructions

SLIP, PPP, or shell account you almost always get a POP account with it; and it
is this POP account that you tell your e-mail software to use to get your mail.
port (input/output) A predefined combination of I/O address and IRQ assigned
to a physical serial or parallel port. They have names that start with “COM” for
serial ports and “LPT” for parallel ports. For example, COM1, one of the preset
designations for serial ports, is defined as I/O address 3F8 with IRQ 4.
port (physical connection) The part of a connector into which a plug is in
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serted. Physical ports are also referred to as jacks.
port or port number In networking, the number used to identify the requested
service (such as SMTP or FTP) when connecting to a TCP/IP host. Some example
port numbers include 80 (HTTP), 20 (FTP), 69 (TFTP), 25 (SMTP), and 110
(POP3).
port replicator A device that plugs into a USB port or other specialized port
that offers common PC ports, such as serial, parallel, USB, network, and PS/2.
By plugging your notebook computer into the port replicator, you can instantly
connect it to non-portable components such as a printer, scanner, monitor, or a
full-sized keyboard. Port replicators are typically used at home or in the office
with the non-portable equipment already connected.
POST (power-on self test) A basic diagnostic routine completed by a system
at the beginning of the boot process. The POST checks to make sure that a dis-
play adapter is installed and that a system’s memory is installed; then it searches
for an operating system before handing over control of the machine to an oper
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ating system, if one is found.
POST cards A diagnostic tool used to identify problems that occur during the
POST. These cards usually fit into a PCI slot and have a series of LED indicators
to indicate any problems that occur during the POST. See also POST (power-on
self test).
PostScript A language defined by Adobe Systems, Inc. for describing how to
create an image on a page. The description is independent of the resolution of
the device that will actually create the image. It includes a technology for defin
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ing the shape of a font and creating a raster image at many different resolutions
and sizes.
POTS (plain old telephone service) See PSTN.
GLOSSARY 53
Passport / Mike Meyers‘ A+ Certification Passport / Meyers / 226308-3 / Glossary
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