Table of Contents
1Introduction
1.1Scope
1.2Referenceconfiguration
2PhysicalmediacharacteristicsattheSbreference
pointfor25,600kbit/sphysicallayerinterface
2.1Transmissionlinkrequirements
2.1.1Lineandbitrates
2.1.2Bitratesymmetry
2.1.3BitErrorRatio(BER)
2.1.4Transmissionlinktiming
2.1.5Freerunningtimingconfigurations
2.2Transmitterrequirements
2.2.1Transmitterzero-crossingdistortion
2.2.2Transmitterwaveshapes
2.2.3Transmitterlaunchamplitude
2.2.4Transmitterreturnloss
2.3Receiverrequirements
2.3.1Receiveracquisition
2.3.2Receiverreturnloss
2.4Copperlinksegmentcharacteristics
2.4.1100ohmlinksegment
2.4.2120ohmlinksegment
2.4.3150ohmlinksegment
3Functionsprovidedbythetransmissionconvergence
sublayer
3.1Cellscramblinganddescrambling
3.1.1PRNGsequence
3.24B5Bblockcodinganddecoding
3.2.1Symbol-pairlevelcodestructure
3.2.2Celldelineation
3.2.3Supportforatimingsignal
3.3NRZIencodinganddecoding
3.4HECgenerationandverification
4References
5Bibliography
6Definitions
7Abbreviations Abstract
Describes physical layer characteristics for transportation of Asynchronous Transfer Mode (ATM) cells at a nominal bit rate of 25,600 kbit/s over 100 ohm UTP, 120 ohm, and 150 ohm STP twisted pair cables at the S[B] reference point of the B-ISDN User Network Interface (UNI). The maximum distance is about 100 m, and existing building wiring may be used.
