THE EFFECT OF DATA-EFFICIENT TRANSMISSION TECHNOLOGIES ON SUBMARINE - PowerPoint PPT Presentation

conference & convention enabling the next generation of networks & services THE EFFECT OF DATA-EFFICIENT TRANSMISSION TECHNOLOGIES ON SUBMARINE CABLE SYSTEM OPERATING MODELS Gavin Doyle Cable and Wireless Worldwide

conference & convention enabling the next generation of networks & services Presenter Profile Gavin Doyle is a Systems Engineer working for Cable & Wireless Worldwide. Gavin joined Cable & Wireless in 2005 as part of the Cable and Wireless graduate training scheme and joined the Submarine Cable Systems department in 2007. Since then he has worked on various cable systems including Maya-1, DSCN, PanAm, Taino Carib, Apollo, EIG and WACS. He is a Prince2 Practitioner and also a Member of the Institution of Engineering and Technology. Gavin Doyle Email: gavin.doyle@cw.com Tel: +44 (0)1344 811874 Mobile Tel: +44 (0)7776 284991

conference & convention enabling the next generation of networks & services The evolving telecoms market The trend in telecoms revenues over the last 10 years indicates: UK Telecommunications Traffic 14 12 • rising use of data 10 ) Revenue (£bn 8 based services. 6 4 • declining fixed voice 2 telephony use 0 8 9 0 1 2 3 4 5 6 7 8 0 0 0 0 0 0 9 9 0 0 0 9 9 0 0 0 0 0 0 0 0 0 1 1 2 2 2 2 2 2 2 2 2 Year Business fixed voice Retail Fixed voice Retail Fixed data Corporate data services

conference & convention enabling the next generation of networks & services Evolving telecoms operators Telecoms operators are now adapting their networks to take advantage of:  High profit margin data services  Increasing volume of IP based traffic  Increasing volume of consumer internet traffic

conference & convention enabling the next generation of networks & services Design principles behind the next generation of terrestrial networks  Based on data efficient IP-based transmission technologies such as Ethernet.  Incorporate network control and traffic management at the higher levels of the network.  Protection architecture is based on ‘mesh’ network.

conference & convention enabling the next generation of networks & services Typical design principles of submarine cable systems  Assume traffic is mainly aggregates of traditional voice channels and not ‘bursty’ data traffic.  Are SDH based cable systems that need to be capable of managing the traffic that it transports.  Assume the SDH based cable system should provide 1+1 protection paths to ensure high system availability.

conference & convention enabling the next generation of networks & services The shortcomings of this approach are that:  Control of the submarine link is out-sourced to the operations and maintenance committee that own the cable system, reducing the visibility and control that operators have over their own traffic.  Capacity bottle-necks are caused by popular SDH drop points.  SDH protection schemes cause poor bandwidth efficiency.

conference & convention enabling the next generation of networks & services And even more importantly: SDH based architectures are not an efficient way of handling data traffic.

conference & convention enabling the next generation of networks & services How can this situation be improved?

conference & convention enabling the next generation of networks & services Interim solutions  Optical Transport Network (OTN G.872 and G.709)  Ethernet over SDH

conference & convention enabling the next generation of networks & services Optical Transport Network vs SDH SDH Transponders STM-n STM-n SDH Line ADM OTN gives the network Ethernet operator a greater Ethernet flexibility of client side interfaces to/from the OTN Transponders SLTE with no need for intermediary ADMs. STM-n Line Ethernet STM-n Ethernet

conference & convention enabling the next generation of networks & services Advantages of OTN  Can transmit various types of traffic across the same infrastructure.  Combines the reliability of SDH with the efficiency of packet based transmission.  Allows system management to be executed by the operator due to a transparent data channel for network management data.  Includes Forward Error Correction to allow users to stretch their power budgets even further.

conference & convention enabling the next generation of networks & services OTN advantages  OTN also accommodates signal levels down to 155Mb/s and also allows concatenation of these signal to form hybrid data-rate channels. OTN Multiplex Structure OPVC (155Mb/s) OTU-1 (2.7Gb/s) OTU-2 (10.7Gb/s) OPVC1-1 OPVC1-2 OPVC1-16

conference & convention enabling the next generation of networks & services Ethernet over SDH Asynchronous Data-stream Framed into Ethernet frames inserted into SDH synchronous layer data-stream Data transported on 2 1 separate SDH 5 4 3 2 1 5 4 3 2 1 4 3 channels using Virtual Concatenation. 5

conference & convention enabling the next generation of networks & services Assuming the trend in telecoms continues towards higher volumes of data traffic What architecture for submarine cable systems would best accommodate this traffic?

conference & convention enabling the next generation of networks & services 10Gb/s Ethernet access would not be of any use to a small investor that currently requires only 2 x STM-16s. The use of IP-VPNs may be a solution to this.

conference & convention enabling the next generation of networks & services The IP-VPN model IP Router/Switch IP Router/Switch VPN 5 VPN 1 VPN 2 VPN 6 VPN 5 Ethernet link Ethernet link Ethernet link VPN 2 VPN 1 Ethernet link VPN 3 VPN 4 VPN 4 VPN 6 IP Router/Switch IP Router/Switch

conference & convention enabling the next generation of networks & services IP-VPN applied to submarine cable systems Ethernet WAN/LAN PHY or OTN Transponders Line Client Ethernet VLAN Ports IP switch/router Ethernet WAN/LAN PHY or OTN Transponders Line Client Ethernet VLAN Ports IP switch/router

conference & convention enabling the next generation of networks & services IP-VPN Class of Service (CoS) Premium Premium Enhanced Enhanced Enhanced Standard Standard Standard

conference & convention enabling the next generation of networks & services IP-VPN design in consortium system  Each operator is assigned a separate VPN on the network  Minimum Investment Unit is the lowest access bandwidth possible on the client side VPN ports.  This VPN bandwidth is guaranteed using CoS to prioritise traffic.  Each VPN bandwidth can exceed the guaranteed maximum when excess capacity exists in other VPNs.

conference & convention enabling the next generation of networks & services To summarise  Telecoms market is evolving towards more data- centric services.  Terrestrial networks have evolved or are evolving to accommodate increased levels of data.  The submarine cable system model is still based on data-inefficient synchronous transmission technology.

conference & convention enabling the next generation of networks & services In conclusion  OTN and Ethernet over SDH can improve the data- efficiency of submarine cable systems.  OTN and Ethernet can allow terrestrial operators to use the submarine cable system as a transparent transmission path.  An IP-VPN (CoS) based system could be implemented on submarine cable systems to handle predominately data based transmission.

conference & convention enabling the next generation of networks & services In conclusion An Ethernet WAN PHY or IP-VPN based system would allow:  Terrestrial operators to incorporate the submarine cable link into their terrestrial ‘mesh’ networks.  MIU bandwidth can be exceeded if sufficient over capacity is available  Client port bandwidth can be upgraded remotely with no capital costs.

2010 conference & convention enabling the next generation of networks & services The 7th International Conference & Convention on Undersea Telecommunications Pacifico Convention Plaza Yokohama & InterContinental The Grand Yokohama 11 ~ 14 May 2010 www.suboptic.org