User Guide

NETNode Operations Guide
Commercial in
Confidence
IP Mesh Systems
000-130
R1.8 2015-07-24
Commercial in
Confidence
Page 6-105
D
Means…
Demodulate
To collect the information originally impressed on the radio wave.
E
Means…
Electromagnetic field
The field of force that an electrical current produces around the
conductor through which it flows.
Electromagnetic
Waves
A wave propagating as a periodic disturbance of the electrical and
magnetic fields and having frequency in the electromagnetic
spectrum; the means by which energy is transmitted from one
area to one more area.
Elementary Stream
(ES)
Elementary streams: These streams contain only one MPEG-2
video channel and no audio. Elementary streams are required if
you intend to operate Milestone or a player that cannot operate
with Transport streams.
You must be in RTSP mode to operate Elementary streams.
Encoder
A processor in a video transmitter which changes analogue video
from a camera to digital data.
F
Means…
FEC
Forward Error Correction is a system of error control for data
transmission, whereby the sender adds redundant data to its
messages, also known as an error-correction code. This lets
the receiver find and correct errors (inside some bound) without
the need to ask the sender for additional data. The advantage of
forward error correction is that a back-channel is not required, or
that retransmission of data can often be prevented, at the cost of
higher bandwidth requirements on average. FEC is thus applied in
situations where retransmissions are relatively costly or
impossible.
Firmware
Software which is installed directly on a device and is intended
specially for that device and is used to control it.
FOV
Field of View - The field of view (also field of vision) is the
angular quantity of the observable world that is seen at a given
moment.
Fading
A periodic decrease in the received signal strength.