Network Redundancy Cost Calculator

N+1 shares a single spare unit across an entire group of working units, so its equipment multiplier is only 1 + 1/nodeCount — with 8 nodes that's just 12.5% more equipment and no additional fiber at all. 1+1 hot standby, by contrast, fully duplicates every piece of equipment and every fiber run (both multipliers are 2.0), because each working path needs its own dedicated backup rather than sharing one spare.

Mesh multipliers are explicitly built to scale with node count: equipment multiplier grows by 0.1 per node (capped at 10 nodes) for the extra switches and routers needed, and the fiber multiplier grows by 0.15 per node beyond the first for the additional inter-node paths a mesh requires. Ring and 1+1 multipliers, by comparison, don't depend on node count at all, which is why mesh becomes relatively more expensive as networks scale up.

Each protection scheme has an assumed 'gap-closure' factor applied to your current availability — for example 1+1 closes 95% of the remaining gap to 100% uptime, mesh closes 98%, and N+1 closes 80%. This is a modeling simplification representing typical real-world outcomes for each topology, not a calculation derived from actual component failure rates or a formal reliability-block-diagram analysis of your specific network.

Payback period is simply additional cost divided by annual revenue saved from avoided downtime, so it only accounts for the revenue-loss input you provide — it ignores other benefits like SLA penalty avoidance, customer retention, or regulatory requirements that might justify redundancy even with a long payback. Since the availability-improvement factors are rule-of-thumb figures, use the payback comparison to rank schemes relative to each other, not as a precise financial guarantee.