ISO/IEC 9314-4:1999

Information technology — Fibre Distributed Data Interface (FDDI) — Part 4: Single Mode Fibre Physical Layer Medium Dependent (SMF-PMD) ISO/IEC 9314-4:1999

Publication date:   Oct 15, 1999

Scope

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 approximately80 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 actuallymeans "FDDI MMF-PMD".b) This standard ISO/IEC 9314-4 (SMF-PMD) which contains the requirements for singlemodefibre (SMF) physical connections between stations.c) ISO/IEC 9314-9 (FDDI LCF-PMD), an alternative lower cost multimode fibre (LCF) forshorter 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 streamfrom station to station. The SMF-PMD specifies the point of interconnectionrequirements for FDDI stations and cable plants at both sides of the Media InterfaceConnector (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 InputInterfaces using single-mode fibre optic cables and optical bypass switchesii) The MIC Receptacle mechanical mating requirements including the keying featuresiii) The single-mode fibre optic cable requirementsiv) The services provided by PMD to PHY and SMT2) A Physical Layer Protocol (PHY), which provides connection between multimode or singlemodePMD and the Data Link Layer (DLL). PHY establishes clock synchronization with theupstream code-bit data stream and decodes this incoming code-bit stream into anequivalent symbol stream for use by the higher layers. PHY provides encoding anddecoding between data and control indicator symbols and code-bits, medium conditioningand initializing, the synchronization of incoming and outgoing code-bit clocks, and thedelineation of octet boundaries as required for the transmission of information to or fromhigher layers. Information to be transmitted on the interface medium is encoded by the PHYinto a grouped transmission code.3) A Data Link Layer (DLL), which controls the accessing of the medium and the generationand verification of frame check sequences to assure the proper delivery of valid data to the– 8 – 9314-4 © ISO/IEC:1999(E)higher layers. DLL also concerns itself with the generation and recognition of deviceaddresses and the peer-to-peer associations within the FDDI network. For purpose of thePHY, references to DLL are made in terms of the Media Access Control (MAC) entity, whichis the lowest sublayer of DLL.4) A Station Management (SMT), which provides the control necessary at the station level to manage the processes underway in the various FDDI layers such that a station may work cooperatively on a ring. SMT provides services such as control of configuration management, fault isolation and recovery, and scheduling procedures.This part of ISO/IEC 9314 is a supporting document to ISO/IEC 9314-1 which should be read inconjunction with it.The SMT document ISO/IEC 9314-6 should be consulted for information pertaining tosupported FDDI station and network configurations.The set of FDDI standards specifies the interfaces, functions and operations necessary toinsure interoperability between conforming FDDI implementations. This part of ISO/IEC 9314 isa functional description. Conforming implementations may employ any design technique whichdoes not violate interoperability.