Polycom realpresence 1800 Administrator's Manual page 211

Setting Conferences for Telepresence Mode (AVC CP)
● Directional media flows, A  B, are shown separately for readability purposes.
RMX Telepresence Layout Mode - Room Switch
In the RMX Telepresence Layout Mode - Continuous Presence figure:
 An HDX endpoint and an OTX Room System connects to RMX A.
 An HDX endpoint and an RPX Room System connects to RMX B.
 This layout requires that the Telepresence Layout Mode to be set to Continuous Presence in the
Conference Profiles of the Cascading Conferences in each RMX.
 The current speaker is the HDX endpoint connected to RMX A.
Polycom®, Inc. 180