Software-defined networking

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Trains, planes and software-defined multilayer networks

Imagine you are in charge of your country’s public transportation. You have three divisions, busses, trains, and aeroplanes. Each division shares patterns of passenger traffic with each other, but otherwise operate independently. The population is generally satisfied with the level of service, even when switching between modes of transport, but you know that this is primarily due to the fact that your budgets have been generous enough to allow each division to build sufficient route capacity and frequency.

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Self-service bandwidth

No self-respecting optical equipment vendor can afford to be without a well-considered strategy for software defined networking (SDN). Over the last 18 months or so, most of the major and second-tier vendors have announced how they intend to approach software control of the optical layer in carrier transport networks – which we will call transport SDN to distinguish it from the more well-developed application of SDN in data centre network environments.

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CableLabs is spearheading efforts to develop a proposal that uses coherent optics to dramatically boost the capacity of hybrid fibre coaxial networks, reports Andy Extance

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Systems vendors are using intelligent software to squeeze more performance from optical networks. Pauline Rigby reports on developments at OFC 2017