Appendix; Glossary - ROHS SV-HVR2800 series User Manual

10.1 Glossary

1. Dual Stream: Dual stream is a technology used to record high resolution video
locally while transmitting a lower resolution stream over the network. The two
streams are generated by the DVR, with the main stream having a maximum
resolution of 4CIF and the sub-stream having a maximum resolution of CIF.
2. DVR: Acronym for Digital Video Recorder. A DVR is device that is able to accept
video signals from analog cameras, compress the signal and store it on its hard
drives.
3. HDD: Acronym for Hard Disk Drive. A storage medium which stores digitally
encoded data on platters with magnetic surfaces.
4. DHCP: Dynamic Host Configuration Protocol (DHCP) is a network application
protocol used by devices (DHCP clients) to obtain configuration information for
operation in an Internet Protocol network.
5. HTTP: Acronym for Hypertext Transfer Protocol. A protocol to transfer hypertext
request and information between servers and browsers over a network
6. DHCP: PPPoE, Point-to-Point Protocol over Ethernet, is a network protocol for
encapsulating Point-to-Point Protocol (PPP) frames inside Ethernet frames. It is
used mainly with ADSL services where individual users connect to the ADSL
transceiver (modem) over Ethernet and in plain Metro Ethernet networks.
7. DDNS: Dynamic DNS is a method, protocol, or network service that provides the
capability for a networked device, such as a router or computer system using the
Internet Protocol Suite, to notify a domain name server to change, in real time
(ad-hoc) the active DNS configuration of its configured hostnames, addresses or
other information stored in DNS.
8. NTP: Acronym for Network Time Protocol. A protocol designed to synchronize
the clocks of computers over a network.
9. NTSC: Acronym for National Television System Committee. NTSC is an analog
television standard used in such countries as the United States and Japan. Each
frame of an NTSC signal contains 525 scan lines at 60Hz.
10. PAL: Acronym for Phase Alternating Line. PAL is also another video standard
used in broadcast televisions systems in large parts of the world. PAL signal
SV-HVR2800 Series DVR User Manual

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