When people talk about the metro data center interconnect (DCI) market, we have to remember that it’s a different topology from the long haul, and thus a different architecture is required. When content providers built their own long haul networks, they were all point-to-point: “no OTN, no ROADMs, please”. The metro, however, is different. Almost every content, colocation and IX provider has at least three data centers in a metro area, and oftentimes up to 12 or more. Do the same products apply that were used in the long haul? No. Do the same topologies exist? No. These are mesh topologies with multiple interconnections established for resiliency where fiber cuts are plentiful and redundancy of local services are a major priority.
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