BS ISO/IEC 9314-5:1995

Foreword
1. Scope
2. Normative references
3. Definitions
4. Conventions and abbreviations
4.1 Conventions
4.2 Abbreviations
5. General description
5.1 Traffic types
5.2 Transmission facilities
5.3 Bandwidth management
5.4 Station structure
6. HRC services
6.1 PHY to H-MUX services
6.2 H-MUX to MAC services
6.3 H-MUX to P-MAC services
6.4 H-MUX to I-MAC services
6.5 H-MUX to SMT services
6.6 I-MAC to CS-MUX services
6.7 I-MAC to SMT services
7. Facilities
7.1 H-MUX symbol set
7.2 Cycle
7.3 HRC protocol parameters
7.4 Variables
7.5 Timers
7.6 Counters
7.7 Signals
7.8 Functions
8. Operation
8.1 Ring operation overview
8.2 Error recovery
8.3 Structure
8.4 Cycle acquisition
8.5 Cycle generation process
8.6 Cycle exchange process
Annexes
A. Examples of the circuit-switch service class
B. FDDI station considerations
C. Isochronous call control procedures
D. Isochronous channel security
E. Isochronous bandwidth management
F. Logical ranking of monitors
Figures
1. Structure of FDDI standards
2. HRC cycle structure
3. Hybrid mode traffic types
4. Bandwidth management hierarchy
5. Data flow through an FDDI-II monitor station
6. Data flow through an FDDI-II non-monitor station
7. Architectural block diagram of the H-MUX
8. Architectural block diagram of the I-MAC
9. H-MUX cycle structure at 100 Mbps
10. H-MUX cycle header
11. Example of wideband channel interleaving
12. Example of wideband channel sorting
13. H-MUX structure
14. HRC receive state diagram
15. WBC template filter state diagram
16. HRC cycle control state diagram
17. HRC cycle generate state diagram
18. WBC template generation state diagram
A.1 Example of a byte interleave burst mode CS-MUX
A.2 Example of a bit interleave burst mode CS-MUX
A.3 Example of a bit interleave continuous mode CS-MUX
A.4 Example of 2048 kbps G.703/G.732 bridge and associated
     CS-MUX
A.5 Example FDDI-II to G.703/G.732 protocol layers
B.1 FDDI-II clock tolerance budget
B.2 Sinusoidal and triangular jitter waves
B.3 FDDI-II allowable input jitter vs. network maximum
     jitter
C.1 Isochronous channel reservation
C.2 Isochronous call establishment
C.3 Isochronous call released from destination station
C.4 Isochronous call released from originating station
C.5 Isochronous channel release

Specifies a hybrid ring control (HRC) protocol which provides a mode of operation in which both packet switched and isochronous data are transmitted within the same special frame structure, called a cycle. Defines the format, clocking and synchronisation of cycles, and the operation and interfaces of the hybrid multiplexer (H-MUX) and the isochronous media access control (I-MAC).

This part of ISO/IEC 9314 specifies a hybrid ring control (HRC) protocol which provides a mode of operation in which both packet switched and isochronous data are transmitted within the same special frame structure, called a cycle. HRC is designed to operate with the existing media access control (MAC), physical layer (PHY), and physical medium dependent (PMD) layers of the FDDI protocol.

The HRC is composed of the hybrid multiplexer (H-MUX) and the isochronous media access control (IMAC) protocols. The H-MUX integrates packet and isochronous data into cycles which it transmits onto and receives from the medium using the services of the physical layer. The l-MAC provides separate transmission channels for the transfer of user isochronous data streams. The format, clocking and synchronization of cycles, and the operation and interfaces of the H-MUX and l-MAC are defined by this part of ISO/IEC 9314. These interfaces include the interface to the FDDI station management (SMT) protocol.

The HRC is designed to support various transmission rates, from 100 Mbps upwards, in increments of 6,144 Mbps. All transmission rate dependent parameters defined in this part of ISO/IEC 9314 assume a transmission rate of 100 Mbps.

Stations composed of FDDI and HRC entities are referred to as FDDI-II stations. The FDDI packet MAC (P-MAC) and the HRC components, and their architectural relationship to LLC and a circuit switching Multiplexer (CS-MUX) are illustrated in figure 1. This figure does not imply an implementation configuration

FDDI-II networks consist of FDDI-II stations. Interoperability between FDDI and FDDI-II stations on the same network is provided in HRC basic mode, which only supports packet transmission.

The set of FDDI standards, ISO/IEC 9314, specifies the interfaces, functions, and operations necessary to ensure interoperability between conforming FDDI implementations. This part of ISO/IEC 9314 specifies a hybrid ring control protocol: HRC. Conforming implementations may employ any design technique that does not violate interoperability.