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ISO/IEC 8802-5 : 1998 and ANSI/IEEE Std 802.5, 1998 Edition Part 5: Token ring access method and physical layer specifications -Description

Abstract: This Local and Metropolitan Area Network standard, ISO/IEC 8802-5 : 1998, is part of a family of local area network (LAN) standards dealing with the physical and data link layers as defined by the ISO/IEC Open Systems Interconnection Basic Reference Model. Its purpose is to provide compatible interconnection of data processing equipment by means of a LAN using the token-passing ring access method. The frame format, including delimiters, addressing, and priority stacks, is defined. The medium access control (MAC) protocol is defined. The finite state machine and state tables are supplemented with a prose description of the algorithms. The physical layer (PHY) functions of symbol encoding and decoding, symbol time, and latency buffering are defined. The services provided by the MAC to the station management (SMT) and the services provided by the PHY to SMT and the MAC are described. These services are defined in terms of service primitives and associated parameters. The 4 and 16 Mbit/s, shielded twisted pair attachment of the station to the medium, including the medium interface connector (MIC), is also defined. The applications environment for the LAN is intended to be commercial and light industrial. The use of token ring LANs in home and heavy industrial environments, while not precluded, has not been considered in the development of the standard. A Protocol Implementation Conformance Statement (PICS) proforma is provided as an annex to the standard.

Keywords: data processing interconnection, local area network (LAN), medium access controls (MAC), token ring

Content +

  • 1. Overview
    • 1.1 Scope
    • 1.2 Normative references
    • 1.3 Definitions
    • 1.4 Conventions
    • 1.5 Abbreviations and acronyms
    • 1.6 Conformance requirements—station
      • 1.6.1 Static conformance requirements
      • 1.6.2 Dynamic conformance requirements
    • 1.7 Conformance requirements—concentrator
      • 1.7.1 Static conformance requirements
    • 1.8 Local regulations
  • 2. General description
    • 2.1 Architectural view
    • 2.2 Station functional organization and data flow
    • 2.3 Physical structure of a token ring network
    • 2.4 Data stations, servers, and system management
  • 3. Formats and facilities
    • 3.1 Formats
      • 3.1.1 Token format
      • 3.1.2 Frame format
      • 3.1.3 Abort sequence
      • 3.1.4 Fill
    • 3.2 Field descriptions
      • 3.2.1 Starting delimiter (SD) field
      • 3.2.2 Access control (AC) field
      • 3.2.3 Frame control (FC) field
      • 3.2.4 Destination address (DA) and source address (SA) fields
      • 3.2.5 Routing information (RI) field
      • 3.2.6 Information (INFO) field
      • 3.2.7 Frame-check sequence (FCS) field
      • 3.2.8 Ending delimiter (ED) field
      • 3.2.9 Frame status (FS) field
      • 3.2.10 Interframe gap (IFG) field
    • 3.3 Medium Access Control (MAC) frames
      • 3.3.1 MAC frame control
      • 3.3.2 MAC frame information field format
      • 3.3.3 Vector descriptions
      • 3.3.4 Subvector descriptions
      • 3.3.5 MAC frame tables
    • 3.4 System timing parameters
      • 3.4.1 Token holding time
      • 3.4.2 Timers
    • 3.5 Station policy flags
      • 3.5.1 Flag, beacon handling option (FBHO)
      • 3.5.2 Flag, claim contender option (FCCO)
      • 3.5.3 Flag, early token release option (FETO)
      • 3.5.4 Flag, error counting option (FECO)
      • 3.5.5 Flag, medium rate option (FMRO)
      • 3.5.6 Flag, multiple frame transmission option (FMFTO)
      • 3.5.7 Flag, reject remove option (FRRO)
      • 3.5.8 Flag, token error detection option (FTEO)
      • 3.5.9 Flag, token handling option (FTHO)
      • 3.5.10 Flag, transmit underrun behavior option (FTUBO)
      • 3.5.11 Flag, good token option (FGTO)
      • 3.5.12 Flag, wire fault detection option (FWFDO)
    • 3.6 Error counters
      • 3.6.1 Counter, abort error (CABE)
      • 3.6.2 Counter, ac error (CACE)
      • 3.6.3 Counter, burst error (CBE)
      • 3.6.4 Counter, frame-copied error (CFCE)
      • 3.6.5 Counter, frequency error (CFE)
      • 3.6.6 Counter, internal error (CIE)
      • 3.6.7 Counter, line error (CLE)
      • 3.6.8 Counter, lost frame error (CLFE)
      • 3.6.9 Counter, receive congestion error (CRCE)
      • 3.6.10 Counter, token error (CTE)
  • 4. Token ring protocols
    • 4.1 Overview
      • 4.1.1 Frame transmission
      • 4.1.2 Token transmission
      • 4.1.3 Stripping
      • 4.1.4 Frame reception
      • 4.1.5 Priority operation
      • 4.1.6 Token ring fault detection, reporting, and recovery
      • 4.1.7 Error reporting
      • 4.1.8 Administration of ring parameters
      • 4.1.9 Configuration control
      • 4.1.10 Early token release (ETR)
      • 4.1.11 Repeat path
      • 4.1.12 Assured delivery process
      • 4.1.13 MAC service interfaces
    • 4.2 Specification definitions
      • 4.2.1 Finite state machine (FSM) notation
      • 4.2.2 Join Ring FSM / Monitor FSM / Transmit FSM interaction
      • 4.2.3 Abbreviations and notations
      • 4.2.4 State machine elements
    • 4.3 Token ring MAC protocol specification
      • 4.3.1 Token identification
      • 4.3.2 Frame identification
      • 4.3.3 Actions on frame errors
      • 4.3.4 Station Operation tables
      • 4.3.5 Precise specification of terms
  • 5. Station specific components
    • 5.1 General
      • 5.1.1 Overview
      • 5.1.2 MAC interface service specification
      • 5.1.3 PMC interface service specification
      • 5.1.4 MAC/PMC interface service specification
    • 5.2 Data signaling rate
    • 5.3 Symbol coding (differential Manchester 1, 0, J, K)
    • 5.4 Repeat path
      • 5.4.1 Repeat/fill
      • 5.4.2 Burst error detection, correction, and indication
    • 5.5 Symbol encoder
    • 5.6 Symbol decoder
    • 5.7 Signal acquisition/loss and timing synchronization
      • 5.7.1 Signal acquisition/loss
      • 5.7.2 Frequency error
    • 5.8 Latency
      • 5.8.1 Ring latency
      • 5.8.2 Fixed latency buffer
      • 5.8.3 Elastic buffer
    • 5.9 Ring access control
  • 6. Token ring management
    • 6.1 Station management primitives
      • 6.1.1 Token ring actions
      • 6.1.2 Token ring events
      • 6.1.3 Attributes
    • 6.2 Token ring station managed objects
      • 6.2.1 TokenRingLayer2MAC MANAGED OBJECT CLASS
      • 6.2.2 TokenRingLayer2MAC NAME BINDING
      • 6.2.3 TokenRingLayer2MAC PACKAGES
      • 6.2.4 TokenRingLayer2MAC BEHAVIOR
      • 6.2.5 Attributes
      • 6.2.6 Attribute groups
      • 6.2.7 Actions
      • 6.2.8 Notifications
      • 6.2.9 MAC Definitions
  • 7. Station attachment specifications
    • 7.1 Media-independent PHY specifications
      • 7.1.1 Accumulated jitter
      • 7.1.2 Accumulated uncorrelated jitter
      • 7.1.3 PHY net delay
    • 7.2 Media-dependent PMC specifications
      • 7.2.1 Phantom signaling and wire fault detection
      • 7.2.2 Transmitter specification
      • 7.2.3 Receiver specifications
      • 7.2.4 Channel specifications for copper cabling
      • 7.2.5 Medium-dependent interface specifications
  • 8. Concentrator specifications
    • 8.1 Concentrator lobe port
      • 8.1.1 Concentrator lobe connector
      • 8.1.2 Concentrator lobe port indicators
    • 8.2 Concentrator trunk ports
      • 8.2.1 Concentrator trunk connector
    • 8.3 Ring access control function
      • 8.3.1 Concentrator ring insertion and ring bypass
      • 8.3.2 Ring insertion/bypass timing
      • 8.3.3 Concentrator ring access control loads
    • 8.4 Passive concentrator
      • 8.4.1 Passive concentrator return loss
      • 8.4.2 Passive concentrator attenuation
      • 8.4.3 Passive concentrator low-frequency attenuation response
      • 8.4.4 Passive concentrator crosstalk
    • 8.5 Active retiming concentrator
      • 8.5.1 ARC port
      • 8.5.2 ARC concentrator specific components
  • Annex A Protocol Implementation Conformance Statement (PICS) proforma
    • A.1 Introduction
    • A.2 Abbreviations and special symbols
      • A.2.1 Status symbols
      • A.2.2 Abbreviations
    • A.3 Instructions for completing the PICS proforma
      • A.3.1 General structure for the PICS proforma
      • A.3.2 Additional information
      • A.3.3 Exception information
      • A.3.4 Conditional status
    • A.4 Identification
      • A.4.1 Implementation identification
      • A.4.2 Protocol summary
    • A.5 Major capabilities
    • A.6 PICS proforma for the MAC sublayer
      • A.6.1 Transmission formats—DS::M
      • A.6.2 Frame parameters—DS::M
      • A.6.3 MAC frames—DS::M
      • A.6.4 MAC frame subvectors—DS::M
      • A.6.5 Timers—DS::M
      • A.6.6 Station policy flags—DS::M
      • A.6.7 Counters—DS::M
    • A.7 PICS proforma for the physical layer
      • A.7.1 Symbol timing—DS::M, ACON::M
      • A.7.2 Symbol encoding and decoding—DS::M
      • A.7.3 Station latency—DS::M
      • A.7.4 Access control
    • A.8 Attachment specifications
      • A.8.1 Accumulated correlated jitter—DS::M, ACON::M
      • A.8.2 Transmitter specification—DS::M, ACON::M
      • A.8.3 Receiver specification—DS::M, ACON::M
      • A.8.4 Connector specification
    • A.9 Concentrator specific requirements
  • Annex B Channel design considerations
    • B.1 Channel transmission parameters
      • B.1.1 Insertion loss
      • B.1.2 Channel noise
      • B.1.3 Channel input/output impedance
    • B.2 Passive channel design example
      • B.2.1 Single passive concentrator design example
      • B.2.2 Multiple passive concentrator design example
      • B.2.3 Passive concentrator with active trunk ports
      • B.2.4 Passive channel design conclusions
      • B.2.5 Cable budget table example for passive concentrators
    • B.3 Active channel design example
      • B.3.1 Design procedure—active channel
    • B.4 Use of alternate media—homogeneous 120 ࡎ cabling
  • Annex C Jitter considerations
    • C.1 Jitter contributions
      • C.1.1 Transferred jitter (1)
      • C.1.2 PLL jitter (2)
      • C.1.3 Transmitter jitter (3)
      • C.1.4 Channel jitter (4)
      • C.1.5 Equalizer error (5)
    • C.2 Jitter budgets
      • C.2.1 Jitter budgets—elastic buffer elasticity and maximum PMC count
      • C.2.2 Jitter budgets—filtered accumulated phase slope (FAPS)
      • C.2.3 Jitter budgets—phase slope tolerance (JTOL)
      • C.2.4 Jitter budgets—real network implementations
      • C.2.5 Outline of an implementation specific DFAPS measurement
      • C.2.6 Clarification of NDT specification
      • C.2.7 Model for calculation of accumulated uncorrelated alignment error
  • Annex D Transmitter example
  • Annex E Safety and environmental considerations
    • E.1 Network safety
      • E.1.1 Installation
      • E.1.2 Telephony voltages
    • E.2 Fault tolerance
    • E.3 Environment
      • E.3.1 Electromagnetic compatibility
      • E.3.2 Temperature and humidity
  • Annex F Low-level finite state machines (FSMs)
    • F.1 Interpreting the FSMs
  • Annex G Differences from 1992 version
    • G.1 Overview
    • G.2 MAC layer differences
      • G.2.1 Partitioning of state machines
      • G.2.2 Enhancements for Join FSM
      • G.2.3 Enhancements for the Monitor FSM
      • G.2.4 Modification to the claiming process
      • G.2.5 Enhancement to beacon process
      • G.2.6 Enhancements to the transmit FSM
      • G.2.7 Filtering
      • G.2.8 Additional differences are
    • G.3 PHY layer differences
      • G.3.1 UTP operation
      • G.3.2 Jitter specification
      • G.3.3 Ring access control (RAC)
      • G.3.4 Concentrators
      • G.3.5 Channel
      • G.3.6 Annexes
  • Annex H Example of a MAC frame parsing algorithm
    • H.1 Overview
    • H.2 MAC frame syntax checking
    • H.3 Syntax checking algorithm
  • Annex I Recommended use of priorities for token ring
    • I.1 Definition of terms
    • I.2 Introduction
    • I.3 Quality of service requirements
      • I.3.1 Non-time critical service
      • I.3.2 Time sensitive service (TSS)
      • I.3.3 Real time critical service (RTCS)
      • I.3.4 Priority and latency relationship
    • I.4 Priority discussion
      • I.4.1 Token-ring priority fields
      • I.4.2 Station priority structure
      • I.4.3 Station priority recommendation
      • I.4.4 Bridging priority recommendations
  • Annex J Bibliography
  • Annex P Bit error rate (BER) criteria for lobe media testing

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