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The Cisco IP/VC 3540 Series H.320-to-H.323 PRI Gateway Module
The Cisco IP/VC 3540 Series Gateway module bridges the gap between the installed base of ISDN videoconferencing
group and room systems and the rapidly growing world of IP-based H.323 systems. The gateways connect H.320
video systems on ISDN to H.323 systems on IP by translating calls initiated from the Public Switched Telephone
Network (PSTN) to their equivalent on the packet network, and vice-versa. Videoconference users have
media-independent worldwide connectivity, regardless of their underlying network technology.
The Cisco IP/VC H.320-to-H.323 Gateway module offers:
• Two ISDN Primary Rate Interface (PRI) ports capable of T1 or E1 rates
• Bonded ISDN calls at 128, 256, 384, 512, 768, or 1420 kbps
• Support for 2B (2 x 64) calls
• Support for restricted mode (56-kbps instead of 64-kbps channels)
• Support for H.261 and H.263 video coding
• Support for G.711, G.728, and G.722 audio coding
• Optional transcoding between G.711 and G.728 or G.723 and G.711
• Call initiation from ISDN to IP, or IP to ISDN
• Interactive-voice-response (IVR) system to transfer inbound ISDN calls to the desired H.323 endpoint or
multipoint conference
• Support for T.120 data conferencing
The Cisco IP/VC 3540 Series Gateway supports up to 23 calls at 128 kbps on ISDN T1 (30 calls on ISDN E1)
or 7 calls at 384 kbps on ISDN T1 (10 calls on ISDN E1), or a mixture of calls at different bandwidths (see
Tables 8 and 9 in the specifications at the end of this document).
The Cisco IP/VC 3540 Series Application Server and T.120 Conferencing Application
The Cisco IP/VC 3540 Series Application Server is a Pentium/Microsoft Windows Server platform that hosts
applications critical to multimedia conferences, including the T.120 Data Conferencing Server Application. The
Application Server/Data Conferencing Server combination makes data sharing an integral part of multipoint
conferences. PC-based H.323 endpoints can be equipped with a T.120 application that allows users to dynamically
share views of an application such as spreadsheets, documents, schedules, or Web pages. The ability to interactively
change numbers in an analysis; point to a Web-page feature; view diagrams, graphic presentations, or slide lectures;
or engage in text chats, whiteboard exchanges, or rapid file transfers can all greatly enhance the discussion.
Based on the ITU T.120 multimedia conferencing standard, the T.120 Data Conferencing Server offers scalability,
reliability, and high performance. In addition to providing processing resources for data sharing while remaining
transparent to conference participants, the server works with the Cisco IP/VC 3540 Series MCU to support a
dynamic graphical-user-interface (GUI) “live” log, which offers the following features:
• Allows the user to monitor the application
• Reports every time a T.120 connection is requested
• Reports when a port is opened or closed
• Provides an alert function in the event of errors
• Is displayed in a generic window
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