AirLive POE-100CAMv2 - Manual (Page 136)

AirLive POE100CAMv2 User’s Manual
135
Proxy server -
In an organization that uses the Internet, a proxy server acts as an intermediary between a workstation
user and the Internet. This provides security, administrative control, and a caching service. Any proxy
server associated with a gateway server, or part of a gateway server, effectively separates the
organization’s network from the outside network and the local firewall. It is the firewall server that
protects the network against outside intrusion.
A proxy server receives requests for Internet services (such as web page requests) from many users. If
the proxy server is also a cache server, it looks in its local cache of previously downloaded web pages. If
it finds the page, it is returned to the user without forwarding the request to the Internet. If the page is not
in the cache, the proxy server, acting as a client on behalf of the user, uses one of its own IP addresses
to request the page from another server over the Internet. When the requested page is returned, the
proxy server forwards it to the user that originally requested it.
PTZ -
Pan, tilt and zoom.
Resolution -
Image resolution is a measure of how much detail a digital image can hold: the greater the resolution,
the greater the level of detail. Resolution can be specified as the number of pixel-columns (width) by the
number of pixel-rows (height), for example, 320x240.
Alternatively, the total number of pixels (usually in megapixels) in the image can be used. In analog
systems it is also common to use other format designations, such as CIF, QCIF, 4CIF, etc.
RTCP (Real-Time Control Protocol) -
RTCP provides support for real-time conferencing of groups of any size within an intranet. This support
includes source identification and support for gateways like audio and video bridges as well as
multicast-to-unicast translators.
RTCP offers quality-of-service feedback from receivers to the multicast
group as well as support for the synchronization of different media streams.
RTP (Real-Time Transport Protocol) -
RTP is an Internet protocol for the transport of real-time data, for example, audio and video. It can be
used for media-on-demand as well as interactive services such as Internet telephony.
RTSP (Real Time Streaming Protocol) -
RTSP is a control protocol, and a starting point for negotiating transports such as RTP, multicast and
Unicast, and for negotiating codecs.
RTSP can be considered a "remote control" for controlling the media stream delivered by a media server.
RTSP servers typically use RTP as the protocol for the actual transport of audio/video data.