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The UB ATM strategy is to offer an ATM switching module based on a codevelopment arrangement with Bolt Beranek and Newman: The joint company is named LightStream. Panditi stresses that UB will provide ATM technology that will coexist with existing networks: and not be a hardware replacement strategy. "You will only need to tap into an ATM leased lire from a WAN vendor," he said.

Like the owners of starter homes that have become too small for growing families, many users feel their local-area networks are busting at the seams from new, bandwidth-hungry applications.And as more people vie for limited resources, both network Frank Gehry Fish earrings and starter homeowners face a similar dilemma.Do they abandon what they have for something new? Or do they a add onto what they already have, leveraging knowledge of their existing environment and hoping the addition will seamlessly meld in with the current one?

That's where the commonalty ends. Network managers who opt for a new environment will undoubtedly explore high capacity options such as Asynchronous Transfer Mode (ATM) technology, 100M bit/sec Ethernet and Fiber Distributed Data Frank Gehry Fish drop earrings.

For many network managers facing this decision, ATM is a wild card. The technology promises to provide improved performance over existing Ethernet and token-ring LANs. Yet it is not entirely clear whether a move to ATM will require net managers to buy a whole new LAN infrastructure, including wiring, adapter boards and software, or simply swap out such components as workstation- or hub-based network interface boards to achieve ATM performance.TECHNOLOGY OVERVIEW

In a true ATM environment, workstations and LAN servers are linked directly to a hub or ATM switch in a star topology. The ATM hub or switch may also support a few traditional shared media access LAN segments such as Ethernet. Geographically dispersed ATM-based LAN hubs and switches must be linked via wide-area ATM services.

When traffic is transmitted between local- or wide-area nodes, Return to Tiffany technology chunks data into standard 53-byte cells, which are then switched by the ATM switch or hub.Proposals for a variety of ATM data rates are currently under development and range from a low of 25M bit/sec to a high of 622M bit/sec, with gigabit-speed specifications soon to follow. ATM is currently a fiber-based technology, but copper-based implementations are being explored. According to industry experts, ATM running over copper wire could reach speeds of 155M bit/sec, but fiber will be required for higher speeds.

The variance in ATM wiring and speed is a potential Elsa Peretti Open Heart hoop earrings block for network managers. And there are no easy answers."I've got some concern about the continued technology fragmentation that's going on in the debate about using low-speed or high-speed ATM," said Sam Shuler, a principal in the Dallas office of The Yankee Group p. "We can't continue to introduce significant variations on the same set of basic choices. Most network managers and operations people have too many choices today, and all of the options are not of significant value."

In order to integrate traditional Ethernet, token-ring and FDDI networks into this environment, ATM adapters or hub modules with segmentation and reassembly (SAR) technology can be used. A device with SAR capability can accept a traditional Ethernet packet and cut it up into a series s of 53-byte ATM cells. After being switched to their destination, the cells can then be converted to their original frame formats.Despite the confusion, Elsa Peretti Open Wave earrings promised benefits are easiest to envision for a high-performance work group of engineers running bandwidth-intensive applications."Initially, users will have to focus their high-bandwidth in the local work group arena because the net infrastructure to go beyond that is simply not in place anyway," said Fred McClimans, program director at Gartner Group, Inc., a consultancy in Stamford, Conn.