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John Boyle, director of marketing, says that a strength of 3Com is "Elsa Peretti Sevillana earrings proofing, meaning that our customers don't have to worry about migrating to future services." As an example, he cites the backplane on the Multi-Services Hub. "It was tested for higher speed services and will support 100-Mbps Ethernet and ATM, or other cell-based services, without upgrading or adding additional management," Boyle said. Network management is unique at 3Com additionally because of its distributed management architecture. Each module "takes care of statistics, and the manager card is a supervisor of the other cards," Boyle pointed out. For users, this translates into less expensive network management modules because "every time you buy another media or LAN card, you're buying a little more management," according to Boyle. 3Com modules also lave built-in repeaters, meaning there is no single point of failure and "even if the management module fails, you lose supervision, but the hub keeps running," he added.

The Multi-Services Hub is often used in a mixed Ethernet Elsa Peretti Sevillana drop earrings Token Ring environment, particularly as a floor wiring concentrator in collapsed backbone configurations. The backbone can support up to 11 unmanaged Ethernet or Token Ring networks, up to 10 managed Ethernet networks, three interconnected managed Ethernet work groups, or five managed Token Ring networks. The new 3Com hub was particularly intended to establish the company in the Token Ring market. Its Token Ring modules provide 12-port multistation access units and can support as many as nine TIFFANY KNOTS EARRINGS access unit interface modules, or a total of 108 end stations.

The ATM plan at 3Com is clearly defined, with implementation slated for late 1993 or early 1994. Stage one of the 3Com ATM strategy will be a collapsed backbone configuration with multiple LAN ATM segments in hubs on each floor to handle increases in backbone segments and performance demands. When requirements for bandwidth increase, stage two provides an ATM downlink by installing appropriate hub modules. The third stage is a collapsed backbone with routed ATM to the desktop

In March, Ungermann-Bass Ungermann-Bass (UB) upped the ante in intelligent hubs with the introduction of its Dragon Switch Module ($900 per port) for the Access/One Enterprise Hub. This created an advanced switching hub based on the 76-Mbps Intel i960 RISC processor. Each Dragon Switch module independently switches full Ethernet bandwidth at each port and can be configured in the Access/One with five modules in HEART LINK DROP EARRINGS 11-slot chassis. Access/One is also available in two-and five-slot configurations. While the Dragon Switch module supports only Ethernet- connections, Access/One supports multiple interfaces, including router/bridges for Token Ring, Ethernet, and FDDI. The UB Access/One backplane, PlusBUS, provides high-speed switching technology at up to 400,000 packets per second, as well as management capabilities. Network management is provided through its NetDirector application for both OS/2 and Unix environments. It is standards based and uses a structured query language relational data base and enhanced SNMP functionality that permits configuration and management of UB and third-party products.

"Dragon Switch is pure horsepower at a multiplexed rate of 400 Mbps," said Surya Panditi, general manager of UB's Access/One business. The architecture is similar to a multiport bridge in that it operates at layer two of the open systems interconnection stack. There are 18 Ethernet ports on each module, and with the maximum of five modules on one hub, 40 Ethernet connections can be delivered. Among the possible configurations Tiffany Cushion Drop earrings an Access/One with Dragon Switch modules is high-performance work group, department, enterprise concentrator, or collapsed backbone. UB stresses that this versatility provides a "lower cost of ownership," according to Panditi. He also points out that when Access/One was introduced in 1988, it contained a high-performance backplane that was not disclosed at the time. "We created a highway that configures to your needs," he said. UB takes configuration to the virtual LAN level to prove it. Its Virtual Network Architecture can create 65,000 virtual LAN segments that are allocated on the basis of work groups, servers, authorization, and management domains. Ports can also be reassigned in software, rather than through wiring changes.