IEEE 802.5c-1991
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
LOCAL AND METROPOLITAN AREA NETWORKS: SUPPLEMENT TO TOKEN RING ACCESS METHOD AND PHYSICAL LAYER SPECIFICATIONS: RECOMMENDED PRACTICE FOR DUAL RING OPERATION WITH WRAPBACK RECONFIGURATION
Hardcopy , PDF
07-23-2013
English
01-01-1991
Section
1 Overview
1.1 Introduction
1.2 Definitions
1.3 Abbreviations and symbols
2 Dual ring station definition
3 Dual ring reconfiguration
4 Dual ring management function
4.1 Dual ring management function inputs
4.1.1 Break indication
4.1.2 MAC insert control indication
4.1.3 Active monitor present indication
4.1.4 Receive beacon reconfigure indication
4.1.5 Receive beacon normal indication
4.1.6 Transmit beacon reconfigure indication
4.1.7 Management interlock flag (MIF) value
4.1.8 Merge permission flag (MPF) value
4.2 Dual ring management function variables
4.3 Dual ring management function timers
4.4 Dual ring management function finite state
machine
4.4.1 State D0: PASS
4.4.2 State D1: NORMal
4.4.3 State D2: TPWBNR
4.4.4 State D3: RBPWRS
4.4.5 State D4: TSWBNR
4.4.6 State D5: WRAPB
4.4.7 State D6: WRAPA
4.4.8 State D&: ISOLated
4.5 Dual ring management function outputs
5 Management interface
5.1 Station management interface
5.1.1 Parameters
5.1.2 Events
6 IEEE 802.5 MAC finite state machine (FSM) changes
for dual ring stations
6.1 MAC inputs
6.1.1 MAC break flag
6.1.2 MAC transmit BNR enable flag
6.2 Changes to the standby monitor FSM
6.2.1 Additional standby monitor state/variable
6.2.2 New/modified standby monitor FSM state
transitions
6.3 Changes to the active monitor FSM
Figure
Fig 1-1 Dual ring architecture
Fig 1-2 Failure recovery by wrapback
Fig 2-1 Dual ring station functional partitioning
Fig 2-2 Dual ring crosspoint function abstract
definition
Fig 2-3 Dual ring crosspoint function abstract
definition in WRAPA state
Fig 3-1 Dual ring wrapback scenario diagram
Fig 4-1 DRFSM inputs/outputs
Fig 4-2 Frequency error detection criteria
Fig 4-3 DRFSM transition diagram
Fig 6-1 Modified/new standby monitor FSM transitions
Fig 6-1 Modified/new active monitor FSM transitions
Table
Table 4-1 DRFSM transition diagram legend
Table 4-2 DRFSM outputs
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