Virgil Dobrota Technical University of Cluj-Napoca...

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Virgil DobrotaTechnical University of Cluj-Napoca, [email protected]

Broadband Networks

Copyright © Virgil Dobrota 2007-2008, All rights reserved

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46. NGN – Next Generation Networks

Course 12 - Outline


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47. NGN – Next Generation Networks


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NGN – Next Generation Networks (I)

ITU-T’s Definition of NGN [Rec. Y.2001]

a packet-based networktelecommunications services to users

multiple broadband + QoS-enabled transport technologies service-related functions independent of the underlying transport-related technologies

unfettered access for users to:networksservice providersservices

generalised mobilityconsistent and ubiquitous provision of services to users

support of multiple last mile technologies


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NGN – Next Generation Networks (II)

BT’s 21CN (British Telecom’s 21st Century Network)through strategic 21CN domains

[Source: http://www.btplc.com/21CN/]

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NGN – Next Generation Networks (III)

BT’s 21CN (British Telecom’s 21st Century Network)Access domain

Multi-service access nodes (MSANs) aggregate the voice, data and video services from end users on to the 21CN core IP-based network. replace the service-specific equipments of the legacy network (System X and AXE10 concentrators for PSTN and ISDN and DSLAMs for broadband).Approximately 5,500 BT sites in the UK will house MSANs with Fujitsu and Huawei selected as suppliers. Copper MSANs - terminate the copper cables from end user customersFibre MSANs - terminate the fibre cables from many business sites.

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NGN – Next Generation Networks (IV)

BT’s 21CN (British Telecom’s 21st Century Network)Metro node

provides the IP routing, Ethernet switching, SDH switching and gateways to existing networks for the unified 21CN network for voice, data and video. approximately 100 metro nodes in the UK with Alcatel, Cisco and Siemens selected to provide the technologyincludes Provider edge IP routers; Ethernet switches; media servers; trunk media gateways and session border controllers.

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NGN – Next Generation Networks (V)

BT’s 21CN (British Telecom’s 21st Century Network)Core node

the high capacity, large scale routers providing cost efficient connectivity between metro nodesapproximately 20 core nodes in the UK with Cisco and Lucent selected to provide the technology, MPLS routers.


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NGN – Next Generation Networks (VI)

BT’s 21CN (British Telecom’s 21st Century Network)i-Node

where the service execution functionality is located - in essence the intelligence that controls services. includes soft switches, network intelligence and bandwidth management capabilities. approximately 10 i-Nodes in the UK with Ericsson selected to provide the technology for the control of voice services which includes call servers; application servers and signalling gateways.

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NGN – Next Generation Networks (VII)

BT’s 21CN (British Telecom’s 21st Century Network)Transmission

includes the optical fibre transport infrastructure that connects all nodes in 21CN but also the electronics that convert the signals carried at high capacity over the cables connecting the MSANs, metro and core nodes. much of the optical fibre infrastructure is already in place and Ciena and Huawei have been selected to provide the electronics which include WDM and high bit-rate SDH cross connects.

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NGN – Next Generation Networks (VIII)

BT’s 21CN (British Telecom’s 21st Century Network)Technologies and protocols


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NGN – Next Generation Networks (IX)

BT’s 21CN (British Telecom’s 21st Century Network)Technologies and protocols

EthernetIMS (Internet Protocol Multi-media Sub-system)IP (Internet Protocol)MPLS (Multi-Protocol Label Switching)SDH (Synchronous Digital Hierarchy)SIP (Session Initiation Protocol)VLAN (Virtual Local Area Network)WDM (Wave Division Multiplexing)


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NGN – Next Generation Networks (X)

BT’s 21CN (British Telecom’s 21st Century Network)Ethernet

BT GigeStream, a low cost, point-to-point Ethernet private circuit service available nationally at speeds of between 250 Mbps and 1 GbpsBT EVLAN, a VPLS-based metro any-to-any Ethernet LAN service BT Enterprise Ethernet, a new low bandwidth version of MegaStream Ethernet that will offer many of the characteristics of a traditional private circuit, but with the benefit of a low cost

Ethernet interface.


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NGN – Next Generation Networks (XI)

BT’s 21CN (British Telecom’s 21st Century Network)IMS (Internet Protocol Multi-media Sub-system)

originally designed for the mobile industry to add a common session layer on top of the IP network layer to support many different applications. standardised for the mobile industry by 3GPP (3G Partners Program). standardised for fixed networks by ETSI TISPAN, adding AAA and QoS control


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NGN – Next Generation Networks (XII)

BT’s 21CN (British Telecom’s 21st Century Network)IP (Internet Protocol)

end-to-end network protocol for all types of communication and applications (now and in the future)


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NGN – Next Generation Networks (XIII)

BT’s 21CN (British Telecom’s 21st Century Network)MPLS (Multi-Protocol Label Switching)

to maximise efficiency, it allows different services - for example, voice, audio and video calls - to be assigned their own portion of the capacity on the links between metro nodes and for that portion to be given the appropriate prioritisationessential protocol for converged IP networks

it ensures that voice is prioritised over less time-critical data


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NGN – Next Generation Networks (XIV)

BT’s 21CN (British Telecom’s 21st Century Network)SDH (Synchronous Digital Hierarchy)

provides transmission pipes between the network nodes (typically at 2.5Gbps or 10 Gbps), although lower speeds of 155 Mbps and 622 Mbps are also usedThe pipes -> into smaller pipes (pipes within pipes) of 2, 34, 45, 150 and multiples of 150 Mbps and these smaller pipes can be switched at network nodes using SDH cross-connects to form an end-to-end connection across the networkvery suitable for leased linesring or mesh topologies protection and restoration

to improve network resilience


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NGN – Next Generation Networks (XV)

BT’s 21CN (British Telecom’s 21st Century Network)SIP (Session Initiation Protocol)

'signalling' standard for setting up a session across an IP networkoriginally standardised by IETF a framework of messages that can be exchanged between two endpoints (user, machine or source of content) to establish a session before media flows between them using IP. Higher layer applications at the edge of the network can set paths up across the network using SIP.intelligence in the network allows service providers to offer presence based routing of calls for their customers.


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NGN – Next Generation Networks (XVI)

BT’s 21CN (British Telecom’s 21st Century Network)VLAN (Virtual Local Area Network)

LAN -> a network of Ethernet links connecting together the computers, servers and printers of an enterprise (single site).WAN -> LANs can be extended geographically VLANs -> a common Ethernet switched network in which the links can be partitioned to provide capacity for several individual LANs.VLANs allow us to partition the capacity of the links according to the needs of the different types of service, for example, voice and video.


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NGN – Next Generation Networks (XVII)

BT’s 21CN (British Telecom’s 21st Century Network)WDM (Wave Division Multiplexing)

a multiplexing technology used for fibreacts like a prism, separating the light in the fibre into different coloured beams - or different wavelength channelsCWDM (Coarse WDM) - the wavelengths are spaced well apart which means lower cost optical transmitters and receivers can be used but the number of wavelengths is relatively small.DWDM (Dense WDM ) - much larger number of closely spaced wavelengths but requires more costly transmitters and receivers.


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NGN – Next Generation Networks (XVIII)

BT’s 21CN (British Telecom’s 21st Century Network)Voice call path - today

Voice call path - tomorrow

MSAN - Multi-Service Access Node , i-node – software that controls the servicesMetro node – routing and signalling


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NGN – Next Generation Networks (XIX)

BT’s 21CN (British Telecom’s 21st Century Network)Broadband - today

DSLAM - Digital Subscriber Line Access Multiplexer

ATM - Asynchronous Transfer Mode

ISP - Internet Service Provider

Broadband - tomorrow

MSAN - Multi-Service Access NodeMetro node – routing and signalling


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NGN – Next Generation Networks (XX)

BT’s 21CN (British Telecom’s 21st Century Network)Voice to Communications Provider - today

Voice to Communications Provider - tomorrow


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