ALCATELLUCENT_Levrau_MPLSforTeleprotection

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Teleprotection over an IP/MPLS

Network

ec n ca va at on

ir. Lieven LEVRAU

Alcatel-Lucent IP Division

April 4th, 2011


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How IP/MPLS Address the challenges of the Utility Networks?

Reliability

Traffic Isolation

Multiple Legacy technologies

High Availability, Fast Reroute, end-to-end,

IP/MPLS based - L2-VPNs, VLL, L3-VPNs, PWE

FR, ATM, TDM, Serial, analog voice, synchronous,

All Rights Reserved Alcatel-Lucent 2011

Security

Unified management

Quality of Service `

Traffic isolation, Rtng protocols authentication, L2/L3Encryption + dynamic secure Key distribution, DoS

Guaranteed bandwidth, low latency and jitter

Enhanced QoS on different network layers

End-to-end secure management of network and

services


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Main Challenges for Teleprotection

End to End Delay

Jitter

Asymmetry

Depending on vendor equipmentMay include packetisation/depacketisation

Variation of delay in certain circumstances such astraffic burst on network

Delay variations between transmit and receive


Resiliency

Denial of Services

Synchronization

Quality of Service

The impact of a failure in the network shouldntbe noticed by application

TDM applications need

end to end synchronization

How DoS/DDoS can affect applications

Guaranteed bandwidth, low latency and jitter

Enhanced QoS on different network layers


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End-to-End TDM Transport Model (only left-to-rightdirection shown)

PacketSwitched

Network(PSN)

DS1

LIU

DS1

LIU

DS1 Data

Sig

Packetization

GigE GigE Data

Sig

Jitter

Buffer

PacketizationNetwork

Playout

DS1

AccessCircuit

AccessCircuit

TDM Packets moving in this direction

All Rights Reserved Alcatel-Lucent 20119 | MPLS Network for Teleprotection | Sep 2009

As TDM traffic from theAccess Circuit (AC) isreceived, it is packetizedand transmitted into thePSN

Two modes of operation:

CESoPSN (RFC5086) forstructured nxDS0/64kchannels

SAToP (RFC4553) forunstructured T1

Packet transfer delay basedon link speeds and distancesfrom end to end

Variable delay

the number of and type of

switches queuing point in theswitches

QoS is key to ensureeffective service delivery

TDM PW packets arereceived from the PSNand stored into itsassociated configurable

jitter buffer

Play-out of the TDM data

back into the AC when itsat least 50% full


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Impact of failure

Todays teleprotection applications were developed towards SDH/PDH 50ms

failover time.

The impact of a failure (node or link) can have huge impact in case the failure

exceeds the 50ms.

MPLS FRR technology allows 50ms failover time in any failure scenario.

These 50ms appl onl in the core of MPLS network, but not in the case of the


Access switch failing.

14 | Teleprotection over IP/MPLS - Validation - March2011


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ALCATELLUCENT_Levrau_MPLSforTeleprotection

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