Incident report · 2026040605
Trans-Pacific Express (TPE) Cable System: latency anomaly, 6 Apr 2026
Resolved · 4h 59m
What we measured
| Cable | Trans-Pacific Express (TPE) Cable System |
| Segment | Tanshui, TW → Nedonna Beach, US |
| Detected | 2026-04-06 16:31 UTC |
| Resolved | 2026-04-06 21:31 UTC |
| Duration | 4h 59m |
| Observed latency | 30.6 ms |
| Baseline | 30.7 ms · 1× |
| Increase | +111% |
| Severity | warning |
Who is affected
Countries where Trans-Pacific Express (TPE) Cable System 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) | APCN-2, Asia Africa Europe-1 (AAE-1), Asia Direct Cable (ADC) +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, APCN-2, Apricot +49 more | median 225 ms today vs 203 ms over 30 days (468 routes) - unchanged |
| South Korea resilience index: 100 · resilient |
1 of 17 cables (6% of submarine diversity) | APCN-2, Asia Pacific Gateway (APG), Asia United Gateway East (AUG East) +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) | APCN-2, Apricot, Asia Pacific Gateway (APG) +17 more | median 9 ms today vs 147 ms over 30 days (129 routes) - faster |
| United States resilience index: 100 · resilient |
1 of 122 cables (1% of submarine diversity) | ACS Alaska-Oregon Network (AKORN), AEC-1, Airraq +118 more | median 116 ms today vs 108 ms over 30 days (3282 routes) - unchanged |
Dependence is structural (share of the country's submarine cables), not a traffic share: real traffic distribution across cables is not public.
Path analysis
No usable traceroute data for this window.
Cross-probe verdict. Too few independent vantage points were watching this endpoint to reach a cross-probe verdict.
Timeline
- Alert #57: warning (backfilled)
- Alert #57 improving: 1/3 consecutive OK checks
- Alert #57 improving: 2/3 consecutive OK checks
- Alert #57 resolved: RTT 30.62ms (baseline 30.71ms)
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.
How to cite
GeoCables (2026). Incident 2026040605: Trans-Pacific Express (TPE) Cable System. https://geocables.com/incident/2026040605
Embed this map
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