2n Helios IP Configuration Manual v2.7 Manuel d'utilisateur télécharger pdf (Page 71)

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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 viaHelios 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 sending2N 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 ONVIF2N 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 image2N 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 in2N 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/

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2n Helios IP Configuration Manual v2.7 Manuel d'utilisateur Page 71

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