Illustrative independent optical-population event cadence
about 110 s between flaps; about 1 h between hard failuresmodeled
| Value kind | modeled — Interpret this value according to its displayed kind, scope, source, and as-of date. |
|---|---|
| Scope | Illustrative assumed rates, not measured fleet telemetry. Count modules, not duplex links; correlate common-cause faults separately. Event rate becomes job-interruption rate only through topology, recovery and affected-job exposure. |
| As of | 2026-03-04 |
| Source | Borrill v1, Table 1 stated component assumptions; guide recomputes the aggregate arithmetic. · Introduction and Table 1; per-optic assumptions ~10^7 h hard-failure MTBF and ~3x10^5 h mean time to flap |
| Derivation | Assume exactly N=10,000,000 optical modules, M_flap=300,000 h and M_hard=10,000,000 h, independent constant rates. M_flap/N*3600=108 s; M_hard/N=1 h. Display rounding: about 110 s and about 1 h. |
| Review | checking…review by 2027-03-01 · standard cadence |
| Recorded changes | last 2026-09-16 · 4 revisions tracked |
| Claim id | link-flap-cadence-in-a-10m-optic-fleet-hard |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.