Chapter 13
Appendix
13.1
Glossary
3G/4G:
3G/4G refers to the 3rd/4th-generation telecommunication technology which is the high speed transmission of
the cell data. The 3G/4G service can transmit sound and other data simultaneously and the bitrate is up to hundreds
kbps.
DHCP:
DHCP is the acronym of Dynamic Host Configuration Protocol, and it is one of the TCP/IP protocol stacks, it
is used to assign the dynamic IP address to the host on the network.
Dual Stream:
Dual stream is a technology used to record high resolution video locally while transmitting a lower
resolution stream over the network.
GNSS:
A satellite navigation system is a system of satellites that provide autonomous geo-spatial positioning with
global coverage. It allows small electronic receivers to determine their location (longitude, latitude, and altitude) to
high precision (within a few meters) using time signals transmitted along a line of sight by radio from satellites. The
signals also allow the electronic receivers to calculate the current local time to high precision, which allows time
synchronization. A satellite navigation system with global coverage may be termed GNSS (Global Navigation Satellite
System).
GPS:
GPS (Global Positioning System) is a space-based global navigation satellite system that provides location and
time information in all weather and anywhere on or near the earth, where there is an unobstructed line of sight to 4 or
more GPS satellite.
G-Sensor:
G-sensor (Gravity-sensor) can sense the change of the
accelerated force, such as the shaking, free falling
and lifting. And those changes of the accelerated force can be sensed by the G-sensor in a means of electrical signals,
and then link certain action according to the changes of the electrical signals. When applied in the hard disk
protection,
G-Sensor can check the current status of the hard disk in case of the affection of the R/W function by the
sudden change of the accelerated force.
NTP:
NTP
is Network Time Protocol, and it is a protocol used to synchronize the computer time.
Sensor-In:
Sensor-In is a built-in module on the mobile DVR used to record the movement information of the vehicle,
such as the braking, left-turning and right0turning and so on. The information can be used for analysis of an accident.
Transparent Channel:
Transparent channel is a mechanism which analyzes the IP datagram and sends it by the serial
interface. It extends the control distance of the serial devices and for the user, only the point to point transmission is
seen and the actual transmission is ignored.
VPDN:
Virtual Private Dial-up Network is a network that uses primarily public telecommunication infrastructure,
such as the internet, to provide remote office or travelling users’ access to a central organization network, such as the
ISP private network, financial network and so on.
Wi-Fi:
Wi-Fi is a mechanism of the wireless connecting electronic devices. A device enabled with Wi-Fi such as PC,
video game console, can connect to the internet via a wireless network access point.
