Tonga Cable: latency up to 2.3× normal, 14 Aug 2026
What we measured
| Cable | Tonga Cable |
| Segment | Nuku'alofa, TO → Suva, FJ |
| Detected | 2026-08-14 12:31 UTC |
| Resolved | 2026-08-14 17:02 UTC |
| Duration | 4h 30m |
| Observed latency | 12.5 ms |
| Baseline | 33.2 ms · 2.29× |
| Increase | +129% |
| Severity | warning |
Who is affected
Countries where Tonga Cable comes ashore, how much of their submarine diversity this cable represents, and what our measurements into them show.
| Country | Dependence on this cable | Other submarine cables | What the measurements show |
|---|---|---|---|
| Fiji resilience index: 81 · resilient |
1 of 9 cables (11% of submarine diversity) | APX East, Bulikula, Gondwana-2/Picot-2 +5 more | median 399 ms today vs 377 ms over 30 days (18 routes) - unchanged |
| Tonga resilience index: 57 · moderate |
1 of 3 cables (33% of submarine diversity) | Hawaiki, Tonga Domestic Cable Extension (TDCE) | no measurement today; median 426 ms over 30 days (7 routes) |
Dependence is structural (share of the country's submarine cables), not a traffic share: real traffic distribution across cables is not public.
Path analysis
Traffic kept the same route. Latency rose without a visible path change, which points at congestion or a fault on the existing route rather than a reroute.
Cross-probe verdict. Other measurements did not confirm the event. We treat this as a probable false positive and label it as such.
Timeline
- Alert 2026081401: warning - ratio 2.29x
- Alert #168 improving: 1/3 consecutive OK
- Alert #168 improving: 2/3 consecutive OK
- Alert #168 resolved: RTT 12.49ms (baseline 33.21ms), 3 consecutive OK
Detection method
Latency is sampled continuously from our probe network. An alert opens when round-trip time to a monitored endpoint holds above its rolling baseline, and closes automatically once it returns. Full method is described on the methodology page.