
Chapter 7 MultiPoint Conferencing - HD3000’s Embedded MCU
108 Emblaze VCON HD3000 User’s Guide
7.4 Cascaded Multipoint Conferences
Up to 4 participants (Chair + 3 sites) at 384 Kbps, or 3 participants at 768 Kbps,
may be joined directly in a conference managed by the HD3000’s MCU. However,
the HD3000 may join up to 10 participants in a Cascaded MCU conference.
A cascaded MCU refers to another HD3000 that has joined two other sites, in
addition to the Chair which called it. In a 10-site session, the Chair calls three other
HD3000/2000 systems, each having joined two other sites.
The following figure shows a conference expanded to six sites by joining a
cascaded MCU. HD3000 A (Chair) has opened a conference with Sites #1, #2 and
#3. Site #3 is HD3000 B, which has joined two other sites - #4 and #5, as well as
being connected to HD3000 A. Therefore, cascading HD3000 B’s MCU expanded
the conference to five sites + a Chair.
The video from HD3000 A is being transmitted to all the sites, and appears as the
main video display on all the systems. The only exception is HD3000 A, whose
own video appears in a PIP window on its monitor.
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