WELCOME

A Presentation on Resilient Packet Ring Technology

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RPR TECH

CONTENTS INTRODUCTION. ETHERNET AND SONET. LIMITATIONS OF ETHERNET AND SONET. WHY RPR TECHNOLOGY ? RPR TECHNOLOGY. CLASSIFICATION OF QOS. RPR CHARACTERISTICS. PACKET RING STANDARD DEVELOPMENT . CONCLUSION.

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INTRODUCTIONPacket-based technologies from LAN to MAN MAC protocol for metro fiber ring networks.Emerging networkTransport of data traffic over optical fiber ring

networks.Ethernet and sonet

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Today’s Traditional Metro Access Networks

ETHERNET

SONET

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ETHERNET• Service offered via Ethernet interface.

• Speed10 Mbps to 10 Gbps

• Rapid acceptance in the marketplace.

• Familiarity, simplicity, and low cost.

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SONET Synchronous optical network. High speed. Run on optical fiber. Multiplexing protocols. Point-to-point circuits between ring nodes.

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WHY RPR TECHNOLOGY ?

• Limitations of sonet and ethernet.

Fixed Circuits. Multicast Traffic. Wasted Protection Bandwidth. Does not have a fast protection

mechanism. Not good at implementing global

fairness.8

RPR TECH

WHY RPR TECHNOLOGYReliability and manageability

Advanced Protection.Distributed Control.Speed And Number Of Nodes. Plug-and-play Operation.Performance Monitoring Capabilities.Bandwidth Management.Unicast, Multicast And Broadcast Data

Traffic.9

WHAT IS RPR TECHNOLOGY• Resilient Packet Ring Tech• Symmetric Counter-rotating Rings• Physical Layers• Spatial Reuse• Quality Of Service

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Symmetric Counter-rotating Rings

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Wrapping the Packets

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Physical Layers

• Physical layer: two existing physical layers of high interest – Ethernet and Sonet/SDH. There are two varieties of each:

• Gigabit Ethernet reconciliation sublayer (GERS) for the Gigabit Ethernet  

• 10-Gigabit Ethernet reconciliation sublayer (XGERS) for the 10-Gigabit Ethernet

• Sonet/SDH reconciliation sublayer (SRS) for Generic Framing Procedure (GFP)

• GFP reconciliation sublayer (GRS) for GFP adaptation sublayer only

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SPATIAL REUSE

Unlike SONET/SDH, bandwidth is consumed only between the source and destination nodes. Packets are removed at their destination, leaving this bandwidth availableto downstream nodes on the ring.

CLASSIFICTIONS OF QOS• SERVICE TYPE

Class A (high-priority)Class B (medium-priority)Class C (low-priority).

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The 802.17 MAC controls traffic access to four different logical services on the ring three of which provide different QOS capabilities:

CLASS A

It is a High priority Quality of service, it provides indefeasible reserved bandwidth that cannot be reclaimed by active lower-priority traffic, even if there is idle bandwidth available on the channel.

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CLASS B

It is a medium priority Quality of service it provides reserved bandwidth that may be reclaimed by active equal- or lower-priority traffic if there is idle bandwidth available on the channel.

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CLASS C

It is a Low priority  Quality of Service it provides a share of any unused ring bandwidth. This channel is for best-effort services only.

RPR CHARACTERISTICS

1. Packet ADM Architecture.

2. Spatial Reuse.

3. Resiliency.

4. Bandwidth Fairness.

5. Broadcast or Multicast Traffic.

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SPATIAL REUSE

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Increase Efficiency.

Bidirectionallytraffic.

Provide Full Bandwidth.

RESILIENCY

•Recovery from a Fiber Cut

•Self-healing or automatic recovery.

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RECOVERY FROM FIBER CUT

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Broadcast or Multicast Traffic

Natural fit for broadcast and multicast traffic.

Nodes can simply receive the packet and forward it.

Packet by sending one copy around the ring.

Reserved Bandwidth of RPR is ¼ the bandwidth

as the SONET multicast.

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BANDWIDTH FAIRNESS

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ETHRNET RPR TECH

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PACKET RING STANDARD DEVELOPMENT IN IEEE 802.17The Institute of Electrical and Electronic Engineers (IEEE) began the RPR standards (IEEE 802.17) development project in December 2000 with the intention of creating a new Media Access Control layer for fiber optic rings.

Some of the goals of the 802.17

Supports dual counter rotating ring topology. Full compatibility with IEEE's 802 architecture. Protection mechanism with sub 50ms fail-over. Packets destination stripping. Avoid technical risk.

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CONCLUSION

True alternative to SONET transport for packet networks.

Fast protection, restoration, and performance monitoring comparable of SONET.

Unlike SONET RPR provides an ETHERNET like cost curve as well as superior bandwidth utilization.

RPR MAC with Ethernet offers highly efficient metro networks.

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THANK YOU

QUIESTIONS

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