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The hub provides interoperability at the hub level. The 100BaseX signaling scheme has a convergence sublayer that adapts the full-duplex continuous signaling mechanism of the FDDI physical medium dependent (PMD) layer to the half-duplex, start-stop signaling of the Ethernet MAC sublayer. 100BaseTX’s use of the existing FDDI specification has allowed quick delivery of products to market. 100BaseX is the signaling scheme used in the 100BaseTX and the 100BaseFX media types. Figure 7-6 illustrates how the 100BaseX convergence sublayer interfaces between the two signaling schemes.

Each new network technology requires its own set of experts. In the early 1980s, the staffing requirements alone for managing large, heterogeneous networks created a crisis for many organizations. An urgent need arose for automated network management (including what is typically called network capacity planning) integrated across diverse environments. Network Management Architecture Most network management architectures use the same basic structure and set of relationships. End stations (managed devices), such as computer systems and other network devices, run software that enables them to send alerts when they recognize problems (for example, when one or more user-determined thresholds are exceeded).

From this point, ongoing measurement of resource use can yield billing information, as well as information used to assess continued fair and optimal resource utilization. Fault Management The goal of fault management is to detect, log, notify users of, and (to the extent possible) automatically fix network problems to keep the network running effectively. Because faults can cause downtime or unacceptable network degradation, fault management is perhaps the most widely implemented of the ISO network management elements.

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Cisco Internetworking Technology Overview


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