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RMX 2000 Administrator's Guide - Polycom Support

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<strong>Polycom</strong> <strong>RMX</strong> <strong>2000</strong>/4000 Administrator’s <strong>Guide</strong><br />

Cascading Conferences - Star Topology<br />

Cascading enables administrators to connect one conference directly to<br />

another conference using an H.323 connection, creating one large<br />

conference. The conferences can run on the same MCU or different MCUs.<br />

There are many reasons for cascading conferences, the most common are:<br />

• Connecting two conferences on different MCUs at different sites.<br />

• Utilizing the connection abilities of different MCUs, for example,<br />

different communication protocols, such as, serial connections, ISDN,<br />

etc....<br />

The link between the two conferences is created when a participant that is<br />

defined as a dial-out cascaded link in one conference (Conference A)<br />

connects to the second conference (Conference B) via a special cascaded<br />

Entry Queue (EQ). When MCU A dials out to the cascaded link to connect<br />

it to conference A, it actually dials out to the cascaded Entry Queue<br />

defined on MCU B.<br />

Conference<br />

A<br />

Cascaded<br />

Link<br />

MCU A MCU B<br />

Figure 2-3 Cascaded Conferences - Star Topology<br />

Conference<br />

B<br />

Though the process of cascading conferences mentioned in this section<br />

refers to conferences running on two different <strong>RMX</strong> units, it is possible to<br />

cascade conferences running between <strong>RMX</strong> units and other MCUs.<br />

Simple cascade links are treated as endpoints in CP conferences and are<br />

allocated resources according to Table 2-3 on page 2-6. Cascaded links in<br />

1x1 video layout are in SD resolution.<br />

In HD Video Switching, simple cascade links behave like HD endpoints if<br />

all HD prerequisites are met - if not, the link is audio only.<br />

EQ<br />

Cascaded<br />

Link<br />

2-51

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