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Developments in Transmission Technologies

Developments in Transmission Technologies. Dr. John S. Graham University of London Computer Centre. Key Areas. Speed Agility ROADM Technology Digital Wrapper Reliability Mesh Protection Access (Ethernet Everywhere) Ethernet OA&M, PM and APS Provider Backbone Transport (PBT).

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Developments in Transmission Technologies

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  1. Developments in Transmission Technologies Dr. John S. Graham University of London Computer Centre

  2. Key Areas • Speed • Agility • ROADM Technology • Digital Wrapper • Reliability • Mesh Protection • Access (Ethernet Everywhere) • Ethernet OA&M, PM and APS • Provider Backbone Transport (PBT)

  3. 40 Gb/s: Deployment Challenges • Deployment over existing infrastructure: • Fibre PMD audit • Line cards require: • Adaptive Dispersion Compensators • Powerful FEC for improved OSNR • Increased transmission distances: • Fibre type • Amplification scheme • Complex line codes

  4. DWDM Network Express VOA + Attenuation OSC OSC DCM Transponders ROADM Implementation Pre-Amp ROADM Post-Amp

  5. ROADM Architectures (1/2) Wavelength Blocker Add Wavelengths Drop Wavelengths

  6. ROADM Architectures (2/2)

  7. ROADM Applications OADM: DWDM ACCESS Rings or Linear Segments 2D-ROADM: Core Network Rings MD-ROADM: Inter-Ring Switching and Mesh Networks

  8. Digital Wrapper (OTN or G.709) • Includes FEC for improved OSNR at high bit rates • Small, efficient OAM structure without need to convert all client signals to TDM • Transports native line-rate 10 G LAN-PHY • Particularly useful for WDM gateway application. • Soon consolidated OTN, SONET/SDH and Layer II MAC switching in a single chassis.

  9. Use of GFP with OTN • Rate adaptation of packet-based client into CBR carrier • Multiple different Ethernet streams can be carried in same OTN frame using GFP CID field • Multiple different client signals can be carried in same OTN frame using GFP PTI field • Multiple different client signals cannot be separately switched

  10. F A B F A B SNCP Mesh E C C D D E Mesh Displacing Rings 2-fibre counter-rotating ring

  11. Provider Backbone Transport Ethernet over SDH or OTN PBT or VPLS

  12. PBT = Deterministic Ethernet • Dispense with flood and learn • No more spanning tree (Hurray!) • Distribute bridging tables using control plane • Carrier switching uses 802.1ah at the edge • Carrier protected from customer’s loops & storms • Fast failover uses reserved 802.1ad B-VID

  13. B-VID = 75 B-VID = 76 B-MAC B-MAC PBT: Ethernet Trunks

  14. Metro Ethernet OAM • 802.3ah = Ethernet in the First Mile OAM • 802.1ag = Ethernet Connectivity Fault Management (CFM)

  15. Context for Ethernet CFM Operator 1 Operator 2 Operator 3 Operator 4 E2E Provider

  16. Connectivity Fault Management • Continuity Check (CC) • multicast from MEPs • catalogued by receiving MEP • Link Trace • Loopback (ping) • Alarm Indication Signal

  17. Ethernet in the First Mile • Discovery • Remote Loopback • Remote Failure Indication • Link Fault • Dying Gasp • Critical Event • Threshold Crossing Events • MIB Variable Retrieval

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