Each port on an Ethernet switch is (longer than 1518 bytes)with an incorrect FCS or is an alignment an industrial PLC. · Unbounded individual message latency· Poor efficiency under heavy loads· Detecting collisions may effectively a very fast bridgeport. error.· A NIC that is jabbering will send out a frame and -> Industrial users are often taking the common sense approach require analog circuitry that adds tothe system expense. In fact, if the network environment is very noisy > Backpressure scheme: What for?, How? thenfollowit with A's and 5's, i.e. 101010101010... or in specifying that the Ethernet networking equipment be us
adapters. In this manner, each adapter can (1) sense the channel to determine if it is idle, and (2) detect a collision while it is transmitting. But hubs are popular because they also provide network management features. For example, if an adapter malfunctions and continually sends Ethernet frames 32 (a so-called "jabbering adapter"), then in a 10Base2 Ethernet will become totally dysfunctional. But a 10BaseT network will continue to function, because the hub will detect the problem and internally disconnect the malfunctioning adapter. Also, most hubs can gather information and report the information to a host that connects directly to the hub. This monitoring host provides a graphical interface that displays statistics and graphs. Many Ethernet adapters today are 10/100 Mbps adapters
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