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Figure 141 Comparison of Ethernet and IEEE 8023 frame structures
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Figure 142 Ethernet and IEEE 8023 networks connect devices in a logical bus topology, where each has
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access to the same transmission media
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Figure 143 The 10Base-T star-wired topology uses twisted-pair cabling and a multiple-port repeater called a hub to implement Ethernet and IEEE 8023 networks
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Mbps using baseband signaling over twisted-pair cabling A 10Base-T hub is a repeater that connects all networked devices together using twisted-pair cabling The star-wired topology of 10Base-T improves the network s tolerance to physical faults, and is easier and less expensive to install and maintain A 10Base-T network is still a logical bus, however, in that all devices must share the same 10 Mbps of transmission bandwidth Ethernet networks perform best under light to moderate traffic loads, generally under 30 to 40 percent of the available media bandwidth The CSMA/CD media access method is inherently random and non-deterministic, meaning that the media access time increases exponentially under heavy traffic loads (Figure 144) The 1518-byte maximum data payload per packet specification also limits the maximum data throughput of Ethernet networks, particularly when Ethernet is used to interconnect Token-Ring or FDDI ring segments, which have larger allowable data packet sizes In these cases, the larger packets must be fragmented or broken up into smaller packets so they can be transmitted over the Ethernet/8023 segment The packet fragmentation process usually is implemented in the routers that interconnect the two different network types Reassembling the fragmented packets is the responsibility of the destination network node Packet fragmentation and reassembly consumes computing resources in the routers and in the end nodes, with a negative impact on network performance Key performance parameters for Ethernet networks include utilization percentage, frame rate (frames per second), collision rate, packet deferral rate, error rate, and average frame size These are explained briefly in subsequent paragraphs, and enumerated in more detail in Table 142
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Collision rate Collisions are a regular Ethernet occurrence and happen when two or more nodes try to send on the media at the same time When a collision occurs,
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Figure 144 The media access time for Ethernet is random and de-
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pends on the traffic volume At high traffic levels, the amount of time required to access the media increases exponentially with traffic volume
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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TABLE 142 There are no standards for acceptable levels of the performance parameters listed below What is acceptable for one network may not be on another because of the number of attached stations, the amount and type of data traffic, and many other factors However, these guidelines can be applied for many typical Ethernet/8023 network implications
Parameter Utilization % Frame Rate Collision Rate Packet Deferral Rate Error Rates Runts Jabbers (Giants) Bad FCS Frames Misaligned Frames Broadcast, Multicast Frame Rate Protocol Distribution by frames by kbytes
Used to Indicate Network (transmission media) congestion Device congestion Network (transmission media) congestion Network (transmission media) congestion Collision fragments; faulty NIC Faulty NIC; misconfigured router Electrical noise; Collision fragments Collision fragments; faulty NIC Misconfigured routers, nodes or applications Consumption of interconnect device bandwidth by application Consumption of network (transmission media) bandwidth by application Efficiency of networked applications
Guidelines <40% sustained utilization <70% peak (1 second) Device dependent (typically <5,000 frames/second) <10% of Frame Rate <10% of Frame Rate
None, except collision-related None None, except collision-related None, except collision-related Network-dependent (generally <20 to 30 per second) Network and application dependent Network and application dependent
Frame Size Distribution
Application dependent (generally, larger frames are more network-efficient than smaller ones)
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