Ericsson W21 - Manual (Page 79)

Glossary
serial number unique to every mobile device.
The IMEI number is used by the mobile
network to identify valid devices.
IP – Internet Protocol
A part of a suite of protocols that effectively
defines the Internet as we know it. Specifies
addressing and control information for routing
data packets over networks.
IP address
The address of a host on the Internet,
consisting of four numbers, each from 0 to
255, separated by periods, for example
192.168.1.1. An IP address consists of a
network ID that identifies the particular
network the host belongs to, and a host ID
uniquely identifying the host itself on that
network. A network mask is used to define
the network ID and the host ID. See also
Private IP address and Public IP address.
LAN – Local Area Network
A computer network limited to the immediate
area, such as a home, office, or small
building.
Lease time
The amount of time that an dynamically
assigned IP address will be valid for a specific
device.
MAC address – Media Access Control
address
The permanent hardware address of a device
assigned by its manufacturer. MAC
addresses are expressed as six pairs of
hexadecimal characters (0-9 and a-f), with
each pair separated by colons. For example:
1a:2b:23:5b:66:9a
Mass Storage
Various techniques and devices used to store
large amounts of data. An example of a mass
storage device is a hard disk.
NAT – Network Address Translation
A service performed by many routers that
translates a network’s IP address into a
private IP address for each device on the
LAN. Only the router and the LAN know these
addresses; the outside world sees only the
public IP address when talking to a computer
on the LAN.
Network mask
A sequence of bits applied to an IP address
to select the network ID while ignoring the
host ID. Bits set to 1 mean “select this bit”
while bits set to 0 mean “ignore this bit”. For
example, if the network mask 255.255.255.0
is applied to the IP address 100.10.50.1, the
network ID is 100.10.50, and the host ID is 1.
See also subnet mask.
Packet
The units of data transmitted on a network.
Each packet contains a payload (the data),
plus overhead information such as where it
came from (source address) and where it will
go (destination address).
Passphrase
A secret password used for WPA and WPA2
wireless data encryption. The encryption is
based on a WPA master key that is derived
from the passphrase and the network name
(SSID).
PC – Personal Computer
A computer designed for use by one person
at a time.
Port
In TCP and UDP networks, an endpoint to a
logical connection. The port number identifies
what type of port it is. For example, port 80 is
used for HTTP traffic.
PIN – Personal Identification Number
A secret code used for individual access to
for example computer networks. Generally, a
PIN is made up of 4 to 10 digits.
PPP – Point-to-Point Protocol
A protocol for serial data transmission that is
1/1551-CRH 102 167 Uen Rev D 2007-11-16 77