3 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 Server) 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
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