Data Communications Networking Devices - 4th Ed.pdf

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3.4 ETHERNET NETWORKS ________________________________________________________ 313Figure 3.20Fast Ethernet 100BASE-T) physical layer subdivision overviewWhen the speci®cations for Fast Ethernet were being developed it wasrecognized that the physical signaling layer would incorporate medium-dependentfunctions if support was extended to two-pair cable 100BASE-TX) operations.To separate medium-dependent interfaces to accommodate multiple physicallayers, a common interface referred to as the Medium Independent InterfaceMII) was inserted between the MAC layer and the physical encoding sublayer.The MII represents a common point of interoperability between the medium andthe MAC layer. The MII can support two speci®c data rates, 10 Mbps and100 Mbps, permitting older 10BASE-T nodes to be supported at Fast Ethernethubs. To reconcile the MII signal with the MAC signal, a reconciliation sublayerwas added under the MAC layer, resulting in the subdivision of the link layer intothree partsÐa Logical Link Control sublayer, a Media Access Control sublayerand a reconciliation sublayer. The top portion of Figure 3.21 illustrates thissubdivision.That portion of Fast Ethernet below the MII, which is the new physical layer, isnow subdivided into three sublayers. The lower portion of Figure 3.21 illustratesthe physical sublayers for 100BASE-T4 and 100BASE-TX.The physical coding sublayer performs the data encoding, transmit, receive andcarrier sense functions. Since the data coding method differs between 100BASE-T4 and 100BASE-TX, this difference requires distinct physical coding sublayersfor each version of Fast Ethernet.The physical medium attachment PMA) sublayer maps messages from thephysical coding sublayer PCS) onto the twisted-pair transmission media and viceversa.The medium dependent interface MDI) sublayer speci®es the use of a standardRJ-45 connector. Although the same connector is used for 100BASE-TX, the useof two pairs of cable instead of four results in different pin assignments.100BASE-T4Figure 3.22 illustrates the RJ-45 pin assignments of wire pairs used by 100BASE-T4. Note that wire pairs D1 and D2 are unidirectional. As indicated in Figure 3.22,
314 ________________________________________________________ LOCAL AREA NETWORKSFigure 3.21100BASE-T4 and 100BASE-TX physical and link layersFigure 3.22100BASE-T4 pin assignmentsthree wire pairs are available for data transmission and reception in each direction,while the fourth pair is used for collision detection.The 100BASE-T4 physical coding sublayer implements 8B6T block coding.Under this coding technique, each block of eight input bits is transformed into aunique code group of six ternary symbols. Figure 3.23 provides an overview of the8B6T coding process used by 100BASE-T4.
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Copyright # 1986, 1989, 1992, 1999
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CONTENTSPrefaceAcknowledgementsxxii
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CONTENTS __________________________
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Data Communications Networking Devi
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1.2 LINE CONNECTIONS ______________
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1.3 TYPES OF SERVICES AND TRANSMISS
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1.4 TRANSMISSION MODE _____________
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1.4 TRANSMISSION MODE _____________
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1.5 TRANSMISSION TECHNIQUES _______
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1.7 LINE STRUCTURE ________________
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1.8 LINE DISCIPLINE _______________
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1.9 NETWORK TOPOLOGY ______________
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1.10 TRANSMISSION RATE ____________
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1.11 TRANSMISSION CODES ___________
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1.12 ERROR DETECTION AND CORRECTION
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1.13 STANDARDS ORGANIZATIONS, ACTIV
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1.16 INTEGRATED SERVICES DIGITAL NE
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4.3 INTELLIGENT MODEMS ____________
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4.6 SECURITY MODEMS _______________
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4.9 BROADBAND MODEMS ______________
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4.10 DIGITAL SERVICE UNITS ________
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4.11 CHANNEL SERVICE UNITS ________
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Data Communications Networking Devi
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