• • • DATA CENTRE MANAGEMENT • • •
over a single fibre, with each channel at a speed of 400 Gbps and 64 channels per fibre pair. Another advantage of DWDM is that the
networks are carried on distinct wavelengths and the channels do not interfere with each other, meaning they can use different data formats and be transmitted at different data rates. This feature is essential for maintaining data integrity and ensuring any security-related partitioning where there are multiple tenants in the same data centre. For these reasons, DWDM technology is a more
appropriate solution for large capacity data transport and connectivity over long distances. It is also useful for densely populated data centres, especially hyperscale cloud service providers or colocation providers for their densely multi- tenanted spaces.
Data Centre Interconnect Data Centre Interconnect (DCI) is a technology that connects two or more data centres together over short, medium and long distances with the use of packet-optical connection. To achieve an effective DCI strategy, companies
can choose to use muxponders. However, for large corporations that require more than 100G connection at a reasonable cost, a more suitable option is the use of QSFP+/QSFP28 ports. By installing a transportation solution directly in such devices, users can eliminate additional hardware and significantly lower the costs of implementation and network maintenance. QSFP28 DWDM solutions rely on advanced
pulse-amplitude modulation and thus provide a capacity of up to 4 TB/s on one fibre and facilitates the connection of data centres located at a distance of even 120 km. A great advantage of these solutions is the fact that the modules are installed directly in network devices and their signal is transferred directly onto multiplexers.
electricalengineeringmagazine.co.uk ELECTRICAL ENGINEERING • JUNE 2022 19
Thanks to this approach companies can have an economical but scalable solution. The entire solution will require the right
multiplexers, optical amplifiers and chromatic dispersion compensators. This is a one-time investment made at the stage of launching the first 100 Gbps transmission. However, a recent analysis conducted by ACG research showed that the application of QSFP28 DWDM transceivers installed directly in network devices allows users to save 58 to 67 per cent on the total cost of ownership (TCO) of transceivers, compared to the use of dedicated transport solutions in data centres situated at a distance of up to 80 km. This ensures a fast ROI for companies, while also giving them the possibility to scale up. For example, to start another 39 channels of 100 Gbps transmission, data centre managers just need to use the right transceivers.
Not only does a QSFP+/QSFP28 port reduce the
total transport solution costs, as it takes up minimal rack space, but it also lowers the power consumption per transmitted bit. This makes it ideal for connecting data centres over distances of up to 120km while maintaining a sustainable installation and deployment. Modern data centres require modern and
advanced solutions. They are no longer seen as just locations for storing data, but increasingly as a viable solution for scaling up businesses and improving customer satisfaction by offering them secure and easy access to their data. DWDM is the ideal technology for connecting data centres and respond to companies’ demands. Higher speeds, more channel capacity and longer distances, makes DWDM the technology of choice for modern enterprises.
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