Network Evolution for Operational Excellence and … · Network Evolution for Operational Excellence and Service ... - Restoration and SNCP/MSP-Ring protection ... Network Evolution

Torino, 15 October 2002

Workshop on “Intelligent High-Capacity Optical Networks: opportunities and challenges”

Valentina Brizi

Network Evolution for Operational Excellence and Service Innovation

Telecom Italia



Valentina Brizi

Agenda

Telecom Italia today's Backbone architecture Towards a “Next Generation Network”How does TI plan for migration?

3Telecom Italia

Valentina BriziIntelligent High-Capacity Optical

Networks: opportunities and challengesTorino, 15 October 2002

TI today's Backbone topology

Recent introduction of Och management and of OADM

Using SDH Rings up to 10 Gbit/s and DWDM systems up to 40 x 10 Gbit/s, with Raman amplification for long-haul links

High speed backbone network connecting all major Italian citiesReliable architecture using double interconnections between each couple of nodes

4 f.o. MS-SPRingRings

SNCP Rings National Backbone

Regional level 1

Regional level 2

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Link DWDM N x 2.5 Gbit/s (N up to 16)

DWDM actual development

- support to SDH ring based network- multiclient (SDH, IP GbE, ATM)lambda services

Link DWDM N x 10 Gbit/s (N up to 40)

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…

ODXC

…

…

…

SNCP Ring

………

…

DXC 4/3/1

DXC 4/3/1

DXC 4/3/1

DXC 4/3/1

DXC 4/3/1

DXC

4/3/1

DXC

4/3/1

DXC 4/3/1DXC 4/3/1

4 fibres MS SPRing Ring

Lambda@ 2.5/10 Gbit/s

ADM

ADM

ADM

ADM

DW

DM

DW

DM

DWDM

DWDM

DWDM

TI today's Backbone topology

DWDM

ADM

DWDM

DWDM

DWDM DWDM

DW

DM

DW

DM

ADM

ADMADM



Valentina Brizi

Agenda


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Wireline Network Model

VOICE

DATAOPTICALACCESS

VOICEACCESS

xDSLACCESS

MANAGEMENTPLATFORM

INTERNETDATA

CENTER

INTERNETDATA

CENTER

INTELLIGENTVOICE

SERVER

INTELLIGENTVOICE

SERVER

EfficiencyEfficiency

InnovationInnovation

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OPTICALACCESS

xDSLACCESS

OPTICALPACKET

BACKBONE

MANAGEMENTPLATFORM

VOICEVOICE

VIDEOVIDEO

DATADATA

Towards a “Next Generation Network”

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Optical Packet BackboneThe “Thin Network”

DWDM

ATM

IP

SDH

OTN

IPIP

SDH

DWDM

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Optical Packet Backbone EvolutionA “Thin” Platform based on:

– IP over Optical Transport Network– Multiservice Data PoPs

IPIP

OTNOTN Multiservices Optical Transport Network (OTN) for SDH, IP and the Next Thing

the IP Backbone transports traffic for Executive and Mass Market Services, Internet Data Centers, private and public peerings, TI mission critical IP networks and voice traffic

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ODXCODXC

OTN POPOTN POPOptical

Transport Network

OTN OTN

Packet BackbonePOP

OTN

OTN

POP

OTN

POP

OTN

POP

POP

The OPB backbone

Optical Transport Level

ATM - IPATM - IPSDH - OTNSDH - OTN

POP

Optical Packet Backbone Evolution

Broadband NAS

Service Gateway

Cache Server

NB NAS ATM Concentrator Media

Gateway

V EDGE Router

POP Architecture

ATM IP

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IP Backbone strategy

Goals:– Capex reduction in deploying a single backbone

infrastructure– Opex reduction related to the number of network elements – Integration with the Optical Transport Level– Deployment of a future proof IP technology

Tools:– broadband and high performance IP infrastructure– enhanced IP/MPLS functionalities (CoS/QoS, MPLS Traffic

Engineering, MPLS Fast Rerouting, MPLS VPN)

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OTN Backbone strategy

Goals:– Reduction of investments – New connectivity services– Introduction of Class of Services concept at transport layer– Strong integration with IP networks– Future proof technology

Tools:– Integrated equipment (SDH and Optical Channel)– Mesh approach– Distributed intelligence

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From rings to mesh

RingsMS-SPRing protection

RingsMS-SPRing protection

OXC :Optical Cross Connect:DWDM 40x10 Gbit/s:DXC 4/3/14/1

MeshRestoration

MeshRestoration

OXC OXC

OXC

OXCOXC

OXC

4/1

4/1

4/14/1

4/1

4/1

16

16 16

16

16

16 16

16

4/1

4/1

4/14/1

4/1

4/1 Node integration: one equipment vs stacked ADMsflexibility: destination reached along different pathsscalability: each span can be upgraded independentlyefficiency: smart use of bandwidth with restoration

16 :Stacked ADM-1616

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From rings to meshRing architecture

– simple and fast protection schemes – simple design and management– low flexibility: due to routing strong constraint– low scalability: each span transport the sum of all the traffic.

In case of traffic growth either all nodes have to be updated oranother ring should be added

Meshed architectures– high flexibility: destination reached along different paths– high scalability: each span can be upgraded independently– efficient use of bandwidth (restoration)



Valentina Brizi

Agenda


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How does TI plan for migration?Input: • actual network topology (existing DWDM systems, existing fibres)• traffic matrix• migration of voice over IP

Requirements: • meshed topology with restoration• Service differentiation • different survivability and fault management according to

Client network requirement• Integration with the SDH ring based network

“Soft” migration: two steps“Soft” migration: two steps

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First Step

SDH network (ring & mesh) + meshed OTNSDH network (ring & mesh) + meshed OTN

Introduction of O-DXC nodes to allow:- flexibility- compatibility with the legacy network- re-use of the actual DWDM systems- different class of survivability:- Restoration and SNCP/MSP-Ring protection for SDH layer- Restoration/protection for Optical Layer

The O-DXC node should integrate:- ADM function (for STM-1, STM-16 and STM-64)- DXC function (for lower order path)- OXC function (OCh switching, OSNCP, OMSP and restoration)

Centralised Control Plane (integration with Network Manager)

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First Step: introduction of integrated equipment

New Optical Digital Cross Connect (OXDC) :

– Cross connection of both SDH and OCh– SDH protection (SNCP and MS-Spring) – Restoration of both VC4 and OCh

ADM

DW

DM

DW

DM

SDHOCh

ODXC

SDHOCh

DW

DM

DW

DM

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First Step: network topology

…

ODXC

…

…

…

SNCP Ring

………

…

Pre-existing DXC 4/3/1

DXC 4/3/1

DXC 4/3/1

DXC 4/3/1

DXC 4/3/1

DXC

4/3/1

DXC

4/3/1

DXC 4/3/1DXC 4/3/1

4 fibres MS SPRing Ring

Meshed topology to supply Optical Channel and/or VC-4 with medium reliability

OD

XC

DW

DM

DW

DM

DWDMPre-existing DWDM

DWDM

DWDM

ODXC ODXC

ODXC

DWDM

DWDM

DWDM

DWDM

OD

XCO

DXC

OD

XC

ODXC

DW

DM

DW

DM

- No change to previous network topology- Node topology change with the introduction of Optical-Digital CrossConnect

-- No change to previous network topologyNo change to previous network topology-- Node topology change with the introduction Node topology change with the introduction of Opticalof Optical--DigitalDigital CrossConnectCrossConnect

DWDM

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First Step: structure of a generic node

STM-1

STM-1, STM-4, STM-16, GbE

DXC 4-3-1

STM-1, STM-4, STM-16, GbE

VC12 o STM-1 structured

STM-16, STM-64 o transponder G.709

OChVC4

DW

DM

STM-16, STM-64 o transponder G.709

STM-1, STM-4, STM-16, STM-64 GbE o transponder G.709

DW

DM

DWDMDWDM

ADM-16/64

ADM-4/16

ODXC

OLO

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Second Step

Totally meshed OTNTotally meshed OTN

Evolution from O-DXC nodes to OXC nodes:- dynamic adaptive restoration- bandwidth optimisation

Control Plane integration of IP, SDH and OTN

Justified only in case of great traffic increaseJustified only in case of great traffic increase

Distributed Control Plane

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CCI: Connection Control InterfaceNMI-A: Network Management Interface for the ASON Control PlaneNMI-T: Network Management Interface for the Transport Network

NNI: Network to Network InterfaceOCC: Optical Connection ControllerUNI: User Network Interface

Management Plane

ASON Control Plane

Transport Plane

Distributed intelligenceEvolution towards ASON

ASON is based on:– Management Plane– Control Plane– Transport Plane (OTN)

OCC OCC OCC

Client Datae.g. IP, ATM,

TDM

CCI

I-NNI

OCC

SGSDHNMI-A

NMI-T

UNISignaling

ODXC ODXC ODXC

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Distributed intelligenceEvolution towards ASON

Benefits of ASON:

– Fast and automatic end-to-end provisioning– Fast and efficient re-routing– Dynamic set-up of connections based on client (and

customer) request– Support of Optical Virtual Private Networks (OVPN)– Support of different levels of Quality of Service

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Management of a ASON in TI

Q3 o Corba

CustomerNetworkManagerSGSDH-NM

Legacy SDHRings

(REGIONAL)

EM rete regionaleEM regional

network

Legacy SDH rings

(NATIONAL)

EM Ariannanetwork

TIRKS/GAT Internet

NMI-A

BackboneASON

Control PlaneUNI

NNIRete client IP/ATM

EMASON

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Economics

Capex reduction– Multivendor Management: competitions among suppliers– New technologies:

• equipment integration• optimisation of existing equipment functionality (DXC used only for lower order path cross-connection)

– New architectures: more efficient use of bandwidth

– Reduction of number of Network Elements (delayering)– Reduction of equipment foot print and power consumption– Powerful multivendor Network Management (SGSDH)– Fast provisioning– Staff reduction

Opex reduction



Valentina Brizi

Network Evolution for Operational Excellence and Service Innovation

Telecom Italia

Documents

Network Evolution for Operational Excellence and … · Network Evolution for Operational Excellence and Service ... - Restoration and SNCP/MSP-Ring protection ... Network Evolution