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6 Appendix
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NTP Abbreviation for Network Time Protocol. The protocol for correctly
adjusting the computer’s internal clock over the network. In a hierar-
chical method, the time is adjusted with the server at the highest lev-
el using GPS to acquire the correct time, which is then referenced by
each lower level host.
OCR Abbreviation for Optical Character Reader. A device or software that
converts handwritten or printed documents to text data by optically
scanning it and, through comparison with a previously stored pat-
tern, specifies the characters.
OS Abbreviation for Operating System. Basic software for controlling
the system of a computer.
PASV Abbreviation for PASsiVe. A mode for connecting to an FTP server
from within a firewall. If this mode is not specified, the firewall will be
considered inaccessible and the connection will be terminated, pre-
venting the file from being sent.
Peer-to-peer A network format that allows connected devices to communicate
without using a dedicated server
PDF Abbreviation for Portable Document Format. An electronically for-
matted document which uses the .pdf extension. Based on the Post-
Script format, you can use the free Adobe Acrobat Reader software
to view documents.
Pixel An image pixel. The smallest unit of an image.
POP Abbreviation for Post Office Protocol. A protocol for retrieving e-mail
messages from a mail server. Currently, POP3 (the third version of
POP) is most often used.
POP Before SMTP A user authentication method for sending e-mail messages. First,
the reception operation is performed and the user is authenticated
by the POP server. Then, IP addresses where the user was success-
fully authenticated by the POP server are permitted to use the SMTP
server. This method prevents third parties without permission to use
the mail server from sending mail messages.
Port number The number that identifies the transmission port for each process
running on a computer on the network. The same port cannot be
used by multiple processes
Proxy server A server that is installed to act as an intermediary connection be-
tween each client and different servers to effectively ensure security
over the entire system for Internet connections
Preview A function that allows you to view an image before processing a print
or scan job
Property Attribute information
When using a printer driver, various functions can be specified in the
file properties.
In the file properties, you can check the attribute information of the
file.
Protocol The rules that allow computers to communicate with other comput-
ers or peripheral devices.
RAW port number The TCP port number used when the RAW protocol is selected for
Windows TCP printing. Usually set to 9100.
Term Definition