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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

Developments in Transmission Technologies

Dr. John S. Graham

University of London Computer Centre


Key areas
Key Areas

  • Speed

  • Agility

    • ROADM Technology

    • Digital Wrapper

  • Reliability

    • Mesh Protection

  • Access (Ethernet Everywhere)

    • Ethernet OA&M, PM and APS

    • Provider Backbone Transport (PBT)


40 gb s deployment challenges
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


Roadm implementation

DWDM Network

Express

VOA

+

Attenuation

OSC

OSC

DCM

Transponders

ROADM Implementation

Pre-Amp

ROADM

Post-Amp


Roadm architectures 1 2
ROADM Architectures (1/2)

Wavelength Blocker

Add Wavelengths

Drop Wavelengths



Roadm applications
ROADM Applications

OADM: DWDM ACCESS Rings or Linear Segments

2D-ROADM: Core Network Rings

MD-ROADM: Inter-Ring Switching and Mesh Networks


Digital wrapper otn or g 709
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.


Use of gfp with otn
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


Mesh displacing rings

F

A

B

F

A

B

SNCP

Mesh

E

C

C

D

D

E

Mesh Displacing Rings

2-fibre counter-rotating ring


Provider backbone transport
Provider Backbone Transport

Ethernet over SDH or OTN

PBT or VPLS


Pbt deterministic ethernet
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


Pbt ethernet trunks

B-VID = 75

B-VID = 76

B-MAC

B-MAC

PBT: Ethernet Trunks


Metro ethernet oam
Metro Ethernet OAM

  • 802.3ah = Ethernet in the First Mile OAM

  • 802.1ag = Ethernet Connectivity Fault Management (CFM)


Context for ethernet cfm
Context for Ethernet CFM

Operator 1

Operator 2

Operator 3

Operator 4

E2E Provider


Connectivity fault management
Connectivity Fault Management

  • Continuity Check (CC)

    • multicast from MEPs

    • catalogued by receiving MEP

  • Link Trace

  • Loopback (ping)

  • Alarm Indication Signal


Ethernet in the first mile
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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