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GLOSSARY
LNB
The Low Noise Block resides at the centre of
parabolic antenna.
Eg. It implements the satellite frequencies that
are between 10.7–11.75 or 11.8–12.75 GHz
in 950 to 2150 MHz and ensures cable trans-
mission with coaxial cables (and with fibre-optic
cables recently) and reception with satellite
receivers.
MP3
Compressed audio file format.
NAS (network attached storage)
The abbreviation NAS is used for devices that
provide data from a hard drive to a network.
Network mask
The network mask or net mask, sometimes also
referred to as a subnet mask, is a bit mask that
separates an IP address into a network part and
a device/host part. It is used in IP networks to
make routing decisions.
Network name (SSID)
The network name (SSID – service set identifier)
is the term used for the identification of a wire-
less network that is based on IEEE 802.11. Every
wireless LAN has a configurable SSID, which
uniquely identifies the wireless network. The
character sequence of the network name can
be up to 64 characters in length. It is configured
in the base station (access point) of a wireless
LAN and set on all clients which access it.
Noise Reduction
Reduces the "snow" areas by displaying the
picture a bit sharper and creating a slight blur.
Thus, it must be used as little as possible with
good picture material.
Perfect Clear
Improves the general image by means of a
gentle blue hue (giving the appearance of
greater sharpness) and increases the black level
by setting this entirely to black from a specific
level of black hue. This reduces the visible grey
values in the dark areas of the picture.
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Special IP Address
Private IP addresses belong to the particular
IP address ranges that are not routed in the
Internet. They can be used by anybody for pri-
vate networks, such as LANs. Many computer
networks require complete connectivity at IP
level, but only limited access to the Internet. If
such a computer network has a private IP ad-
dress range, it forms an Intranet whichcannot be
accessed from the Internet as the Internet rout-
ers ignore private address ranges. A gateway
or router that is placed in this private network
and which has a public address in the Internet
as well as a private IP address makes the con-
nection to the Internet. This can be performed
by a proxy or using NAT/PAT/masking. As the
address range used can only be viewed within
the private network, the same range can also
be used in other private networks. The unique
nature of an IP address required by the Internet
protocol is ensured by this restricted visibility.
Proxy server
A proxy or proxy server is a service programme
for computer networks that administers data
transfer. It makes data transfer faster, and can
also increase security by implementing access
control mechanisms. The transfer is conducted
between computers or programmes in computer
networks. On the server side, the proxy acts as
a client; on the client side, it acts as a server.
Router
A router is a network component that links sev-
eral computer networks. Router analyses (on the
basis of layer 3 information) the network pack-
ages of a protocol it receives and forwards it to
the intended destination network. Conventional
routers work on layer 3 of the application layer.
A router has an interface for every network con-
nected to it. When data is received, the router
determines the correct path to the destination
and thereby the suitable interface via which the
data can be transferred. For this it uses a locally
available routing table that specifies via which
router connection a particular network can be
reached.
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ENGLISH
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