SubTel Forum Magazine #121 - Data Centers and New Technology

Page 20



Creating Regional Connections From Data Centers Through Fiber Selection and High-Powered Amplifiers



n recent times the way subsea cables interconnect the worldwide data network has changed. Historically submarine systems were terminated in cable landing stations sited as close to population centers and to the landing locations as possible. This reflected the origins of the data flows which were – if we go back far enough – circuits connecting users, and then more recently, user or enterprise-originated data paths, possibly to a data center or another user or enterprise. If you had been able to drill down and interrogate the majority of data flows, they would have been a transaction recognizable to a human, perhaps a phone call, perhaps a demand for information or streaming data in real time. But then, sometime in our recent lifetime, the world changed… It is only 20 years since Google built its first data center (DC), roughly coinciding with the founding of Equinix out of Digital Equipment Corporation. It is roughly 10 years since Facebook’s first DC, and only 15 years since the first iPhone. That is a complete data revolution in 20 years. The consequence is that what fills the pipes now is mostly machine-generated data flows based on algorithms. Recent data suggests that between 50 and 65% of all internet traffic is ‘bots’. Good bots would be aggregator crawlers, search engine crawlers, social network bots, shop bots and monitoring bots, while the best known bad-bot would be a Distributed Denial-of-Service (DDoS) botnet. Unfortunately, research suggests that those bad bots account for perhaps 50% more traffic than the good




guys. These patterns of data traffic have led to industry and market revolutions – compare the customer base and funding sources for subsea cable systems today to twenty years ago, and to an imperative for technology to keep up! When subsea cables connected people, the signals arrived at the cable landing station and from here the signal was regenerated and transmitted terrestrially inland towards PoPs and then DCs based in cities and hubs. Now that machines spend much of their time and energy (literally) exchanging with each other systems are primarily designed to connect Data Centers to Data Centers, directly facilitating an end-to-end network that as far as possible resembles one pane of glass. Those Data Centers are also in locations

Fig 1: Crossover cost point for repeatered vs unrepeatered links as distance increases, for 100Tb/s and 20Tb/s capacities.