Polycom RealPresence 1800 Administration Manual page 115

● When creating a cascading link between two MGCs the MGCs must be configured to operate in VSW
mode.
For more details about the MGC to MGC connection, see MGC Manager User's Guide, Volume II,
Chapter 1, Ad Hoc Auto Cascading and Cascading Links.
● To enable the connection of the links between cascaded conferences, they must run at the same line
rate.
● To enable Content sharing between the Collaboration Server and the MGC, the rate allocated to the
content must be identical in both conferences. Make sure that the line rate set for both conferences,
and the Content Settings (Graphics, Hi-res Graphics or Live video) are selected correctly to ensure
the compatible rate allocation.
The following table summarizes Video Session Modes line rate options that need to be selected for each
conference in the cascading hierarchy according to the cascading topology:
MIH Cascading – Video Session Mode and Line Rate
Topology MCU Type
Level 1 RMX
Level 2 RMX
Level 1 RMX
Level 2 RMX
Level 1 RMX
Level 2 MGC
Level 1 MGC
Level 2 RMX
Level 1 MGC
Level 2 RMX
Level 2 RMX
Level 3 RMX
Level 2 MGC
Level 3 MGC
Level 2 RMX
Level 3 MCS 4000
Level 2 RMX
Level 3 MCS 4000
* When MGC is on Level 3, Content cannot be shared between Level 2 and Level 3.
Polycom, Inc.
Video Session Type
CP - HD
CP - CIF
CP
CP or VSW
CP - CIF 263
CP - CIF 264
VSW - HD
VSW HD
CP - HD
VSW*
CP/VSW -HD
CP - CIF
Line Rate
1.5Mb/s, 1Mb/s, 2Mb/s
768Kb/s, 2Mb/s
768Kb/s, 2Mb/s
768 kb/s, 2Mb/s
1.5Mb/s
1.5Mb/s, 1Mb/s, 2Mb/s
384 kbps, 768 kbps
1.5Mb/s, 1Mb/s, 2Mb/s
768kb/s, 2Mb/s
Cascading Conferences
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