Sanyo NETWORK CAMERA VCC-WB4000P Instruction Manual page 71

Glossary of Terms
MAC address (Media Access Control
address)
A 12-digit hexadecimal identification number that
is assigned to LAN cards and LAN boards in a
computer. Complex device arrangements may
use IP addresses, but whereas IP addresses are
assigned as required by a network system
administrator, MAC addresses are burned into
the LAN card at the time of manufacture.
Ethernet uses the MAC address as the basis for
transmission of data.
Memory
A memory device is a semiconductor device that
stores digital data in units of single bits (binary
digits) that consist of either 0s or 1s.
Modem
A device that converts between analog signals
(from telephone lines) and digital signals (such
as from computers).
Network
A variety of computers and other devices that
are connected together by means of cables
(wired) or via a wireless LAN so that they can
exchange data with each other.
NTP server
NTP (Network Time Protocol) is a system for
synchronizing clocks for different computers that
exist on a common network. The server that
functions as the reference point has a time
tracking device such as an electromagnetic
clock, cesium clock or GPS that can measure
time extremely accurately. The internal clock of a
network camera can be synchronized with such
a server to automatically keep the camera's time
accurate.
Port number
This is a number that is used to identify
applications on the Internet. For example, SMTP
for e-mail is normally 25 and HTTP (web-related
software) is usually 80.
PPP (Point to Point Protocol)
A protocol (communication standard) that
determines the process by which two points
(computers) are connected across a network
using telephone lines.
POP before SMTP
POP before SMTP is a function whose purpose
is to prevent the relaying of spam (unsolicited
e-mail messages). Before an e-mail message is
sent, POP authentication* is carried out so that
the server can verify whether the message is
from a genuine user or not. This prevents the
server from being used in an unauthorized way
to send out spam e-mail messages.
POP authentication is authentication that is
*
carried out when e-mail is received from a
mail server.
POP server
A service provider or rental server is divided into
a server for only sending e-mail messages
(SMTP server) and a server for only receiving
e-mail messages (POP server).
The server that is used to receive these e-mail
messages is called a POP server.
Resolution
This indicates the quality of images. The
numbers represent the degree of detail for the
images during printing or displaying, and the
units used are "dpi" (dots per inch).
Router
A device that connects one network to another
network. It looks up IP addresses for network
devices and determines what route should be
used for the information to be transmitted to and
from these devices.
– 70 –
English