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Physical Path Diversity

Proving that two paths are actually separate — by routing them over infrastructure you own rather than trusting a carrier's map.

Also known as Route Diversity, Diverse Paths

Left to right is time. Each row is one of the 12 disciplines this one worked alongside, ordered so kindred disciplines sit next to each other rather than alphabetically — a landscape only means anything if neighboring rows belong together. Height is the work running in that domain in that year, weighted by what failure would have cost — life-safety ×3, a statutory obligation ×2.2, the estate itself ×1.5, an evaluation ×1. Every project declares which of those it was, so each ridge traces to an entry you can open and disagree with. Only the work that used this technology is counted, so what shows here is the company it kept rather than the record around it. Height and color are on the record-wide scale rather than this page’s own, so a modest estate draws a modest landscape and any two of these pages can be read against each other.

Built physical path diversity into the Florida LambdaRail consortium connection using infrastructure the city already owned: separate primary and backup fiber routes running over different bridge crossings on opposite structures, into a carrier facility, with an out-of-region backup path to Atlanta.

Diversity that exists only on a carrier’s paper map tends to converge in a single conduit somewhere. Routing over assets we controlled meant the paths could be proven separate rather than asserted separate.

Applied in

  • Enterprise Core Network2005–2024The city's core network across nineteen years — architecture, standards and, when it mattered, hands on the equipment.
  • Data Center Estate and Colocation Program2015–2024Six tiered sites for the city and five external agencies — and a municipal IT department selling colocation against commercial carriers, and winning on engineering.
  • Cecil Disaster Recovery Data Center2015–2023Facility and network design for the recovery site — power, cooling and carrier entry as well as what ran inside.
  • Fire & Rescue Mobile Gateway and SD-WAN Overlay2012–2023Three hundred apparatus turned into routed nodes on the enterprise network — dual carriers on private APNs, head-ends behind two providers, and a zero-trust overlay behind a firewall virtual system built for the fleet.
  • Reliability Engineering Practice2000–2023A reliability toolchain bought for one utility engagement in 2000, carried into a city estate, and still running twenty-three years later — availability as a computed number rather than a drawn assertion.
  • Florida LambdaRail Regional Consortium2013–2020Five independently governed public bodies onto the state research and education network, over fiber paths that could be proven separate.
  • Republican National Convention — National Special Security EventJune – October 2020Critical Infrastructure Subcommittee for a national special security event relocated to the city eight weeks into planning — first-responder mobility, venue design, carrier redundancy, and federal sensors landed on a municipal estate.
  • Municipal Fiber Plant2005–2016Citywide outside plant built as interlocking rings, designed down to conduit, manhole, slack and splice.
  • One Spark Festival Wireless2013–2015Forty-two access points in downtown traffic signal cabinets, backhauled over the fiber that runs the lights, with Ubiquiti mesh between intersections as the fallback and a tenfold internet burst for the week.
  • JEA Power Quality Metering Network2001–2004Voltage sags, swells and harmonics measured at ten substations — one template design, an addressing plan built for it, and fiber off the ground grid, before the data was aggregated into the PIE SCADA platform.

See also

Also searched as

  • dark fiber
  • outside plant
  • OSP
  • conduit design
  • metro fiber
  • fiber route diversity