Technologie de l'information - Interface de données distribuées sur fibre (FDDI) - Partie 4: Single-Mode Fibre couche physique Medium Dependent (SMF-PMD)
Porté:
This part of ISO/IEC 9314 specifies the Single-mode fibre Physical Layer Medium Dependent (SMF-PMD) requirements for the Fibre Distributed Data Interface (FDDI). FDDI provides a high bandwidth (100 megabits per second) general purpose interconnection among computers and peripheral equipment using a fibre optic waveguide as the transmission medium. The FDDI may be configured to support a sustained transfer rate of approxi mately 80 megabits (10 megabytes) per second. The FDDI may not meet the response time requirements of all unbuffered high speed devices. The FDDI establishes the connection among many stations distributed over distances of several kilometers in extent. Default values for FDDI were calculated on the basis of 1000 physical connections and a total fibre path length of 200 kilometers (see the MAC Standard – ISO/IEC 9314-2 or ISO/IEC 9314-8). The FDDI consists of: 1) The Physical Layer Medium Dependent (PMD) is specified in four alternative standards: a) ISO/IEC 9314-3 (FDDI PMD) corresponding to multimode fibre (MMF) which actually means "FDDI MMF-PMD". b) This standard ISO/IEC 9314-4 (SMF-PMD) which contains the requirements for singlemode fibre (SMF) physical connections between stations. c) ISO/IEC 9314-9 (FDDI LCF-PMD), an alternative lower cost multimode fibre (LCF) for shorter distances. d) ISO/IEC 9314-10 (FDDI TP-PMD), a copper twisted pair (TP) alternative. An FDDI ring can be made up of all these alternatives. (For some restrictions see 6.4). The PMD provides all services necessary to transport a suitably coded digital bit stream from station to station. The SMF-PMD specifies the point of interconnection requirements for FDDI stations and cable plants at both sides of the Media Interface Connector (MIC) for conforming stations utilizing single-mode fibre. SMF-PMD includes the following: i) The optical power budgets for two (2) categories of Active Output and Active Input Interfaces using single-mode fibre optic cables and optical bypass switches ii) The MIC Receptacle mechanical mating requirements including the keying features iii) The single-mode fibre optic cable requirements iv) The services provided by PMD to PHY and SMT
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