Appendix A Glossary And Troubleshooting; Glossary - NEC NRS Expanded Series Configuration Manual

Glossary and Troubleshooting
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NVR Configuration Guide (Advanced) for NRS Expanded Series
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.
HDD: Acronym for Hard Disk Drive. A storage medium, which stores digitally
encoded data on platters with magnetic surfaces.
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.
HTTP: Acronym for Hypertext Transfer Protocol. A protocol to transfer hypertext
request and information between servers and browsers over a network.
PPPoE: 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.
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.
Hybrid DVR: A hybrid DVR is a combination of a DVR and NVR.
NTP: Acronym for Network Time Protocol. A protocol designed to synchronize the
clocks of computers over a network.
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.
NVR: Acronym for Network Video Recorder. An NVR can be a PC-based or
embedded system used for centralized management and storage for IP cameras, IP
Domes and other DVRs.
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 contains 625
scan lines at 50Hz.
Appendix A
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