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Layer Model
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The RPR layer model and its relationship with the OSI reference model are illustrated in Figure 121 The RPR standard specifies the MAC control sublayer, the MAC datapath sublayer, the reconciliation sublayers, the MAC service interface and the PHY service interface The MAC service interface provides service primitives used by MAC clients to exchange data with one or more peer clients, or to transfer local control information between the MAC and MAC client The MAC control sublayer controls the datapath sublayer, maintains the MAC state and coordination with the MAC control sublayer of other MACs, and controls the transfer of data between the MAC and its client The MAC datapath sublayer provides data transfer functions for each ringlet The PHY service interface is used by the MAC to transmit and receive frames on the physical media Distinct reconciliation sublayers specify mapping between specific PHYs and medium independent interfaces (MIIs) The standard includes the definition of a reconciliation sublayer for each of the most commonly used PHYs and permits other reconciliation sublayers
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RPR Layers Higher Layers OSI reference model layers Application Presentation Session Transport Network Data-link Physical Logical Link Control (LLC) MAC client MAC control Fairness Topology and protection MAC data path OAM MAC service interface
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PHY service interface
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Physical layer Medium Figure 121 RPR service and reference model relationship to the ISO OSI reference model
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Ring Structure
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RPR employs a ring structure using unidirectional, counter-rotating ringlets Each ringlet is made up of links with data flow in the same direction The ringlets are identified as ringlet0 and ringlet1, as shown in Figure 122 Stations on the ring are identified by an IEEE 802 48-bit MAC address All links on the ring operate at the same data rate, but may exhibit different delay properties
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The RPR MAC Specification
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The services provided by the MAC sublayer allow the local MAC client to exchange data with peer client entities in other stations, and to exchange parameters to control the operation of the local MAC entity The client may omit some parameters, and leave their control to the discretion of the MAC sublayer; the MAC sublayer will set these parameters according to the standard definitions Optionally the MAC operation can be fully controlled by the client, but in that case it is the client responsibility to use these parameters in a way that does not violate the standard behavior of the MAC
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West East
Span
Links
S3 ringlet1
ringlet0
Dual ring structure and conventions
Resilient Packet Ring (RPR)
The MAC provides two types of frame transmission services: Strict and Relaxed
Strict
The Strict transmission service guarantees that all delivered data units are not duplicated nor reordered, at the expense of discarding more data frames than in the Relaxed mode
Relaxed The Relaxed transmission service has the same guarantees as the Strict service, except while recovering from failures in the ring in which case a negligible amount of reorder or duplication can occur Since Relaxed mode is more effective than Strict mode, its use is recommended when possible To support services with different quality of service demands, the MAC supports three classes of service (CoS) into which the services may be mapped by the MAC client according to their specific quality of service requirements
ClassA ClassA service provides an allocated, guaranteed data rate and a low end-to-end delay and jitter bound; as such classA can be used to support services such as TDM pseudo wire emulation Within this class, the MAC uses two internal subclasses, subclassA0 for reserved bandwidth and subclassA1 for reclaimable bandwidth The subclassA1partition is more efficient, but limited by the sizes of secondary transit queue ClassA traffic is not subject to the fairness algorithm at ingress to the ring or when transiting through the ring ClassA traffic has precedence over classB and classC traffic at ingress to the ring, and during transit through the ring (for dual-queue stations) ClassA traffic moves through the primary transit path in each station as it propagates around the ring, as a result a classA frame in transit can be preempted only by a frame that started transmission into the ring before the classA arrived to the transit station Description and operation of the primary and secondary transit paths, and descriptions of single-queue and dual-queue models, are provided later on in this paper ClassB ClassB service provides an allocated, guaranteed data rate, bounded endto-end delay and jitter for the traffic within the allocated rate; and access to additional best effort data transmission that is not allocated, guaranteed, or bounded, and is subject to the fairness algorithm Within this class, the MAC uses fairness eligibility markings to differentiate the committed information rate portion of classB (classB-CIR) and the excess information rate portion of classB (classB-EIR) ClassB is useful for services that require a guaranteed bandwidth component, but have also the ability to accesses more resources when available ClassC ClassC service provides a best-effort traffic service with no allocated or guaranteed data rate and no bounds on end-to-end delay or jitter ClassC traffic is always subject to the fairness algorithm In a single-queue implementation, classC traffic moves through the primary transit path In a dual-queue implementation, classC traffic moves through the secondary transit path
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