APCN-2 cable: latency up to 2.6× normal, 22 Jul 2026
What we measured
| Cable | APCN-2 |
| Segment | Kitaibaraki, JP → Katong, SG |
| Detected | 2026-07-22 09:01 UTC |
| Resolved | 2026-07-22 10:31 UTC |
| Duration | 1h 30m |
| Observed latency | 89.2 ms |
| Baseline | 98 ms · 2.63× |
| Increase | +163% |
| Severity | warning |
Who is affected
Countries where APCN-2 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 |
|---|---|---|---|
| China resilience index: 100 · resilient |
1 of 24 cables (4% of submarine diversity) | Asia Africa Europe-1 (AAE-1), Asia Direct Cable (ADC), Asia Link Cable (ALC) +20 more | median 159 ms today vs 160 ms over 30 days (99 routes) - unchanged |
| Japan resilience index: 100 · resilient |
1 of 53 cables (2% of submarine diversity) | 5 Villages 6 Islands, Apricot, Asia Direct Cable (ADC) +49 more | median 225 ms today vs 203 ms over 30 days (468 routes) - unchanged |
| Malaysia resilience index: 100 · resilient |
1 of 34 cables (3% of submarine diversity) | Asia Africa Europe-1 (AAE-1), Asia Link Cable (ALC), Asia Pacific Gateway (APG) +30 more | median 217 ms today vs 180 ms over 30 days (47 routes) - slower |
| Philippines resilience index: 100 · resilient |
1 of 26 cables (4% of submarine diversity) | Apricot, Asia Connect Cable-1 (ACC-1), Asia Direct Cable (ADC) +22 more | median 284 ms today vs 244 ms over 30 days (102 routes) - slower |
| Singapore resilience index: 78 · resilient |
1 of 46 cables (2% of submarine diversity) | Apricot, Asia Connect Cable-1 (ACC-1), Asia Direct Cable (ADC) +42 more | median 155 ms today vs 163 ms over 30 days (509 routes) - unchanged |
| South Korea resilience index: 100 · resilient |
1 of 17 cables (6% of submarine diversity) | Asia Pacific Gateway (APG), Asia United Gateway East (AUG East), E2A +13 more | no measurement today; median 98 ms over 30 days (22 routes) |
| Taiwan resilience index: 100 · resilient |
1 of 21 cables (5% of submarine diversity) | Apricot, Asia Pacific Gateway (APG), Asia United Gateway East (AUG East) +17 more | median 9 ms today vs 147 ms over 30 days (129 routes) - faster |
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 2026072201: warning - ratio 2.63x
- Alert #156 improving: 1/3 consecutive OK
- Alert #156 resolved: RTT 89.24ms (baseline 98.03ms), 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.