2N Helios IP Configuration Manual v2.8 - Manual (Page 71)

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2N TELEKOMUNIKACE a.s., www.2n.cz
®
Explanation of Terms
RTP (Real-Time Transport Protocol) – is a protocol defining the standard packet
format for audio/video transmission via IP networks.
employs 2N Helios IP
®
this protocol for audio/video streaming. The RTP transport protocol is either UDP
or also RTSP and HTTP.
RTSP
– is a network protocol for streaming (Real-Time Streaming Protocol)
server control (controls setting up, launching and stopping of audio/video
streams).
HTTP
– helps transmit practically any contents (Hypertext Transfer Protocol)
and is used primarily by internet browsers for web server communication. 2N
®
uses the HTTP to transmit static JPEG images or MJPEG streams via Helios IP
the HTTP Server Push.
IP Multicast – is a way of parallel sending of IP packets from one source to
multiple stations via IP networks.
uses IP multicast for sending 2N Helios IP
®
and receiving audio streams.
ONVIF (Open Network Video Interface Forum) – is a set of video camera
search, configuration and administration specifications for the IP network. The
intercoms are ONVIF compatible and fully implement the ONVIF 2N Helios IP
®
Profile S.
JPEG – is a standard method of lossy compression of images.
MJPEG – is a video stream encoding format in which each image is compressed
separately by JPEG. MJPEG encoding produces high-quality video at a
significantly higher bit rate compared to the methods mentioned below.
H.263 – is a video stream compression standard used in telecommunications.
Unlike MJPEG, H.263 uses differences between consecutive images and provides
a significantly higher level of compression to the detriment of the video stream
quality.
H.263+ – is like H.263, but supports a different bit stream packetisation
method.
MPEG-4 part 2 – is a video stream compression standard used mostly in areas
other than telecommunications, but often supported by IP camera and video
surveillance systems. In
, the compression level and image 2N Helios IP
®
quality are comparable with the H.263 standard.
H.264 – is a video stream compression standard. Compared to H.263 and
MPEG-4, H.264 provides an approximately identical level of video stream quality
but a half bit rate. This type of compression is sometimes called MPEG-4 part 10.
G.711 – is one of the most common audio transmission standards in
telecommunications. It uses the sampling frequency of 8 kHz and data are
compressed using logarithmic compression.
List of Parameters
RTSP
The intercoms integrate an RTSP server, which can be configured in 2N Helios IP
®
this tab. The RTSP server allows for audio/video streaming. You can choose the data
transmission method, video compression method/parameters and other parameters
associated with transmission security and quality.
Enter the following RTSP Uri for connection to the intercom RTSP server:
rtsp://intercom_ip_address/