GlobalConnect 3 (GC3): A Short Submarine Cable in Denmark
GlobalConnect 3 (GC3) is a submarine cable connecting two locations in Denmark:
Korsor and
Nybor. With a length of just 19 kilometers, it is among the shortest submarine cables in operation globally. Despite its modest scale, GC3 plays a role in the regional connectivity infrastructure managed by GlobalConnect, a major telecom operator in Northern Europe.
What stands out about GC3 is the lack of publicly disclosed technical details, such as its design capacity, fiber pair count, or supplier. This absence of information makes it challenging to assess its technological profile or compare it with other cables in the same family system. Additionally, while GeoCables records its ready-for-service (RFS) year as 2006, industry sources do not provide corroborating data, leaving room for potential discrepancies.
Quick facts
🗺 Show GlobalConnect 3 (GC3) on the interactive cable map
Route
GC3 connects Korsor and Nybor, two locations in Denmark situated across the Great Belt strait. This corridor is geographically significant as it bridges the western and eastern parts of Denmark, facilitating data transmission across the country. The cable's short length suggests it primarily serves as a localized link rather than a transcontinental system. Both landing points are within the Danish mainland, emphasizing its role in domestic connectivity.
Why it was built and what it carries
The construction of GC3 likely aimed to enhance intra-Denmark connectivity, providing a reliable link across the Great Belt. This strait is a critical geographic feature separating the main Danish islands of Zealand and Funen. By establishing a direct submarine cable connection, GlobalConnect ensured high-speed data transfer between the two regions, supporting both residential and enterprise customers. Given the lack of disclosed capacity data, it is unclear whether GC3 is optimized for high-bandwidth applications or serves as a redundancy link within the broader GlobalConnect network.
History: what can be established
GeoCables records GC3's ready-for-service year as 2006, but no corroborating industry sources are available to confirm this date. If the 2006 RFS date is accurate, it places GC3 among the earlier submarine cables developed by GlobalConnect, which has since expanded its network with systems like GlobalConnect 2 (GC2) and GlobalConnect 6 (GC6). The absence of detailed historical documentation limits further insights into its construction timeline, supplier involvement, or initial deployment challenges.
Capacity and technology
Publicly available data does not disclose GC3's design capacity, fiber pair count, or the technology employed. Without operator documentation, attributing specific capabilities to the cable would be speculative. However, as part of GlobalConnect's network, GC3 is likely integrated with terrestrial systems and other submarine cables to ensure smooth data flow across Denmark and beyond. Its short length suggests relatively straightforward engineering requirements compared to longer transoceanic cables.
Latency: the physics
The computed one-way light propagation latency for GC3 is approximately 0.1 milliseconds over its 19-kilometer wet segment. The theoretical round-trip time (RTT) floor for this segment is about 0.2 milliseconds, assuming light travels at speeds between 200,000 and 204,000 kilometers per second in fiber. Real-world RTT measurements would be higher due to additional factors such as land tails, terminal equipment, and routing. No live latency measurements are currently available for GC3, and any estimates beyond the theoretical floor would require direct testing.
Redundancy: what happens if it breaks
In the event of a failure, redundancy for GC3 would likely rely on other cables within the GlobalConnect network, such as GlobalConnect 2 (GC2) or GlobalConnect 6 (GC6). These systems, along with terrestrial fiber routes, provide alternative pathways for data transmission. Repairing GC3 would involve standard industry practices, including deploying cable ships to locate, retrieve, and repair the damaged section. Given its short length, repair operations would likely be faster and less complex than for longer cables.
Bottom line
- GlobalConnect 3 (GC3) is a 19-kilometer submarine cable connecting Korsor and Nybor in Denmark.
- Its ready-for-service year is recorded as 2006, though corroborating industry sources are unavailable.
- Technical details such as design capacity, fiber pairs, supplier, and technology are not publicly disclosed.
- Latency for the wet segment is theoretically 0.1 ms one-way, with real-world RTT expected to be higher.
- Redundancy is provided by other cables in the GlobalConnect network, including GC2 and GC6.