Dahua Mobile DVR Series - 9 Glossary

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9 Glossary
 DHCP: DHCP (Dynamic Host Configuration Protocol) is a network protocol. It is one of the
TCP/IP protocol cluster. It is principally used to assign temporary IP addresses to computers
on a network.
 DDNS: DDNS (Dynamic Domain Name System) is a service that maps Internet domain
names to IP addresses. This service is useful to anyone who wants to operate a server (web
server, mail server, ftp server and etc) connected to the internet with a dynamic IP or to
someone who wants to connect to an office computer or server from a remote location with
software.
 eSATA: eSATA(External Serial AT) is an interface that provides fast data transfer for external
storage devices. It is the extension specifications of a SATA interface.
 GPS: GPS (Global Positioning System) is a satellite system, protected by the US military,
safely orbiting thousands of kilometers above the earth.
 PPPoE: PPPoE (Point to Point Protocol over Ethernet) is a specification for connecting
multiple computer users on an Ethernet local area network to a remote site. Now the popular
mode is ADSL and it adopts PPPoE protocol.
 Wi-Fi: Wi-Fi is the name of a popular wireless networking technology that uses radio waves
to provide wireless high-speed Internet and network connections. The standard is for wireless
local area networks (WLANs). It is like a common language that all the devices use to
communicate to each other. It is actually IEEE802.11, a family of standard The IEEE (Institute
of Electrical and Electronics Engineers Inc.)
 3G: 3G is the wireless network standard. It is called 3G because it is the third generation of
cellular telecom standards. 3G is a faster network for phone and data transmission and
speed Is over several hundred kbps. Now there are four standards: CDMA2000, WCDMA,
TD-SCDMA and WiMAX.
 Dual-stream: The dual-stream technology adopts high-rate bit stream for local HD storage
such as QCIF/CIF/2CIF/DCIF/4CIF encode and one low-rate bit stream for network
transmission such as QCIF/CIF encode. It can balance the local storage and remote network
transmission. The dual-stream can meet the difference band width requirements of the local
transmission and the remote transmission. In this way, the local transmission using high-bit
stream can achieve HD storage and the network transmission adopting low bit stream
suitable for the fluency requirements of the 3G network such as WCDMA, EVDO,
TD-SCDMA..
 On-off value: It is the non-consecutive signal sampling and output. It includes remote
sampling and remote output. It has two statuses: 1/0.