NCast Telepresenter M4 - Manual (Page 8)

NCast Telepresenter Reference Manual
One-to-Many Streaming – In this mode of operation one of the Telepresenters is designated
as the “Sender” and all of the other units are designated as “Receivers”. The media streams
originate from the Sender and are decoded by one or more Receivers. The transmission is
strictly one-way, and no feedback or interactivity is provided for. The one-to-many operation is
enabled via use of multicast connected networks.
Full-Duplex Streaming – Two Telepresenters can be connected via a point-to-point unicast or
multicast link. Each endpoint will be transmitting to the other endpoint and simultaneously
receiving a stream from the remote unit.
Collaboration Mode – Two or more Telepresenters can be engaged in NCast’s proprietary
Collaboration Mode. In this mode, one unit is designated as “Conference Coordinator” and all
other units are designated as “Conference Participants”.
The Coordinator is the master controller for the conference, and is allowed to pass control to
any participant in the conference at any time. When a participant receives control, the
participant’s unit begins transmission and the coordinator’s unit stops transmission. All other
units are then “tuned in” to the media stream being generated by the participant unit which
was granted control. When the participant’s presentation is done, the coordinator takes back
floor control and continues the conference as before.
In this mode the audio from each unit transmits continuously, and at each receiver all audio
streams are combined or mixed to allow real-time interactive discussion amongst all
participants. Use of collaboration mode audio requires external echo-canceling microphones
or amplifiers to avoid problems with echo and feedback. Equipment made by companies such
as ClearOne (was Gentner), PolyCom or others is a must for quality audio-conferencing
results.
Collaboration mode requires units to be situated on a multicast-enabled network, or to use N-
Way bridging technology.
NCast Corporation Revision 2.2
Page 8