3Com 3C63311 Reference Guide - Page 252
number associated with that vpi/vci, the central unit sees activity on that line
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240 APPENDIX B: PATHBUILDER S330/S310 MODULE AND APPLICATION OVERVIEW Multi-point Video Conferencing In multi-point video conferencing an MCU (Multi Conference Unit) device is connected to one T1-DSX/E1 CBR port of a PathBuilder S600 or PathBuilder S330/S310 at the central site. The remote PathBuilder S330/S310 switches communicate with each other via their serial (V.35/RS-366) ports, as they do in point-to-point video conferencing. In addition, the remote units can communicate with the MCU at the central site over a vpi/vci associated with a fractional T1/E1 bundle of the CBR port connected to the MCU. When a remote unit dials the number associated with that vpi/vci, the central unit sees activity on that line and automatically starts transmitting over the vpi/vci, thus completing the circuit. Figure 179 illustrates multi-point video conferencing between three remote PathBuilder S330 switches (#1111, #2222, and #3333) and one central PathBuilder S600 switch (#4444) connected to an MCU. Figure 179 Multi-point Video Conferencing Video/Audio Codec Video/Audio Codec Video/Audio Codec V.35/ RS-449/ RS-530/ X.21 RS-366 V.35/ RS-449/ RS-530/ X.21 RS-366 V.35/ RS-449/ RS-530/ X.21 RS-366 PBS330 #1111 PBS330 #2222 PBS330 #3333 ATM PathBuilder S600 n x T1/E1 PBS600 #4444 MCU