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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,
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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
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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
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Access switch failing.
14 | Teleprotection over IP/MPLS - Validation - March2011
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