The H.321 protocol is designed to support H.320 compressed video using ATM switched virtual circuit transport. The use of switched virtual circuits conserves network bandwidth by only using it when a conference is actually in progress. It also conserves network resources because point-to-point conferences do not need the services of a multipoint control unit (MCU). The following items describe how the VCCS uses the H.321 protocol to support compressed video in its ATM environment.

• H.320 to H.321 Video Network Upgrade Overview

• H.321 Compressed Video Network Model

• H.321 Commonwealth Classroom Model

• H.321 Commonwealth Conference Room Support:
• Commonwealth Conference Room Model
• H.321 Commonwealth Conference Room Guideline, When Available

• H.321 Video Bridging Support:
• H.321 Video Bridging Model
• H.321 Video Bridging Guideline

• H.321 Video Network Upgrade FAQ

• CVN Operator Guide