Can participants electronically annotate shared images in real time (T.120)? Can users at different sites interactively share, manipulate and exchange still images (T.120)? Does system offer very-high-resolution graphics (including CAD support)? Is graphics subsystem an integral component or is it an outboard product? If external and PC-based, how does the graphics sub-system connect to the codec? Can system support the need for photorealism? (X-rays, medical imaging applications). Is a flatbed scanner included in price? (This is an application-driven requirement). If scanner is included what is the size of the bed? What is the scanner's color depth (4-bit grayscale, 24-bit color, etc.)? Multipoint Control Unit List proprietary video/ audio algorithms supported. Are conference ports are universal? Video Communication: the Whole Picture State the MCU maximum port size. With how many ports is it proposed? Describe the expansion process. Describe how the product can be upgraded to a more fully-featured model. How can MCUs be cascaded to expand capacity? Does cascading consume ports? Does it create delays in end-to-end transmission? Explain. Describe MCU in terms of network interfaces (e.g., public, private, LAN). What network speeds are supported? How many simultaneous conferences can take place at any given speed and how are the MCU bridging capabilities subdivided? Does system offer a director/chairperson control mode of operation? A voice- activated mode? A rotating mode? Other? Explain. In voice-activated mode, how does the system prevent loud noises from diverting the camera? Does the product offer full support of the ITU-T H.231/H.243 Recommendation? Explain fully. How does the MCU provide graphics support and what limitations exist? Does the MCU support G.729a audio? Does the MCU operate in meet-me, dial-out and hybrid arrangements? After a conference is arranged, state all limitations in terms of the user's ability to add conferees or change transmission speeds. Are conference tones provided to signal a conf