NCast N-Way Server - Manual (Page 5)

NCast N-Way Reference Manual
1.4.T
ELEPRESENTER
U
NITS
The Telepresenter is a stand-alone network communications appliance which captures RGB (VGA) signals from
a desktop or laptop, compresses the image with an industry standard compression algorithm, packetizes and
transmits the imagery as an internet media stream, receives a media stream from the internet, decompresses the
imagery, and presents the received information to a viewing audience through use of a large-screen computer
(VGA) monitor or via a room projector. Some Telepresenter models also archive the media stream in real-time,
allowing for playback by the recipient at a later date.
The following Telepresenter models are capable of using N-Way services:
Telepresenter S – A small stand-alone unit used primarily for webcasting.
Telepresenter G2 – A rack mounted unit with streaming and archiving capabilities.
Telepresenter M2 – A desktop unit with MPEG-2 video, PCM audio and JPEG graphics.
Telepresenter M2P – A rack mounted unit with streaming, archiving, collaboration and PIP capabilities.
Telepresenter M3 – A rack-mounted unit with streaming, archiving, collaboration, UXGA and PIP
capabilities.
Telepresenter M3 Series 2 – A rack-mounted unit with streaming, archiving, collaboration, WUXGA, HD
and PIP capabilities.
All Telepresenter models share a core operating system and base set of features.
1.5.N-W
AY
S
ERVER
F
UNCTIONALITY AND
M
ODES OF
O
PERATION
The N-Way Server supports the following major services:
1.5.1.One-to-Many Streaming using RTSP and the Auto Unicast (Announce) Feature
In this configuration a Telepresenter is given the IP address of the server and utilizes a unicast RTP stream to
broadcast directly to the server. The server then “reflects” the streams to clients logged in via RTSP protocol.
The “Auto Unicast (Announce)” facility is a mechanism within the RTSP protocol to automatically provide the
server with the correct SDP media-file information. The server automatically installs an .SDP file for the Session
and client players simply reference that .SDP to begin the connection and begin playing. The .SDP file is also
automatically removed when the Session stops, thus disconnecting any connected clients. The Announce feature
eliminates the need to manually configure and install .SDP files at the server.
NCast Corporation Revision 1.3
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