HIKVISION DS-M7608HN, Руководство пользователя

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Network Video Recorder Quick Start Guide
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Chapter 18 Appendix
18.1 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 device used to record the movement
information of the vehicle, such as the braking, left-turning and right-turning 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.