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The boards provide real-time audio and video capture and compression. The software, called FluentStreams, manages video and audio processes in the network, including support for scalable video.That means a NetWare server with FluentLinks can dynamically allocate bandwidth and adjust compression rates on the fly to support changing video demands. In this way, FluentLinks can support from two to 16 concurrent video sessions on one Ethernet LAN (see Figure 1, this page).

FluentLinks stores digital motion video and audio files on NetWare servers for access by client PCs running Microsoft Corp. Windows and FluentStreams software. FluentLinks displays the video in a window on the user's PC screen, thereby enabling users to implement applications such as video training, voice-annotated file transfer and desktop videoconferences.While some vendors argue that products such as FluentLinks make it possible to support wholesale silver pendants alongside text and image data, others concede that users will still experience slowdowns on Ethernet and token rings.

Products such as FluentLinks cannot totally compensate for the perfomance limitations of today's LANs. The number of concurrent video sessions that can be run is limited. Furthermore, the potential adverse effect of a few video sessions on network response times for data users is a major concern.For full-scale networking of multimedia applications in which any number of LAN users can participate. CWRU's Neff believes that very substantial bandwidth --in the area of the 155M bit/sec provided by the SONET Optical Carrier-3 specification--will have to be installed to each desktop. "If you can't do that, you're going to be in trouble doing full multimedia on a daily basis," Neff says.

Recognizing this fact, many net managers are looking to FDDI and ATM-based networks for solutions. FDDI, which supports transmission rates up to 100M bit/sec, is considered an acceptable but not optimal high-bandwidth solution. Its main advantage wholesale silver earrings that it is available today.A great deal of interest is being focused on the longer term availability of ATM services. Initially targeted solely as a technology for wideband telecommunications networks, ATM now is envisioned as a wideband transport system for LANs.

ATM would be well suited for networked multimedia for three reasons:* It switches fixed-sized 53-byte cells, reducing and making predictable transmission delays to eliminate voice and video clipping.* It supports speeds from 51M to more than 1G bit/sec, sufficient bandwidth for full-scale multimedia applications.* It can allocate bandwidth while supporting connectionless channels for data traffic and connection-oriented channels for voice and video.According to wholesale silver necklaces Haigh, president of JWP Network Services' Technical Services Division, a Pittsburgh data communications consultancy, ATM cards for LAN hubs will be available within a few months at costs comparable to those for today's FDDI cards.Meanwhile, a Swedish government-sponsored research effort relating to multimedia support in wideband networks is investigating alternatives that support speeds in the multigigabit range. The program, called MultiG, is not only deploying ATM as one of many protocols, but is looking at a new protocol, Dynamic synchronous Transfer Mode, which reportedly offers bandwidth allocation capabilities superior to those of ATM.

So while a large number of U.S. users are focusing on ATM as the solution for wholesale silver rings multimedia applications on LANs, the Swedes are questioning just how efficient ATM is at allocating bandwidth on demand and are exploring alternatives.