CADMOS: a regional submarine cable connecting Lebanon and Cyprus
The CADMOS submarine cable is a 230-kilometer fiber optic system linking Lebanon and Cyprus. Operational since 1995, according to GeoCables records, it provides international connectivity between
Beirut and
Jdaide in Lebanon and
Pentaskhinos in Cyprus. The cable is owned by a consortium of operators, including A1 Telekom Austria, AT&T, Cyta, Deutsche Telekom, the Lebanese Ministry of Telecommunications, Orange, Sparkle, Syrian Telecommunications Establishment, and Tata Communications. While CADMOS remains in service, key technical details such as its design capacity, fiber pair count, supplier, and specific technology are not publicly disclosed.
What makes CADMOS particularly interesting is its longevity and the fact that it operates within a corridor rich with alternative cables. It shares landing points with newer systems like
CADMOS-2 and
MedNautilus Submarine System, raising questions about its current role in the region's connectivity landscape. Additionally, the latency measurements from remote probes suggest that real-world performance is significantly higher than the theoretical floor, highlighting the complexities of end-to-end internet routing.
Quick facts
| Cable name | CADMOS |
| Length | 230 km |
| Ready-for-service year | 1995 (GeoCables database; conflicting industry sources not identified) |
| Owners | A1 Telekom Austria, AT&T, Cyta, Deutsche Telekom, Lebanese Ministry of Telecommunications, Orange, Sparkle, Syrian Telecommunications Establishment, Tata Communications |
| Status | In service |
| Design capacity | Not disclosed |
| Fiber pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing points | Beirut (Lebanon), Jdaide (Lebanon), Pentaskhinos (Cyprus) |
🗺 Show CADMOS on the interactive cable map
Route
The CADMOS cable connects Beirut and Jdaide in Lebanon to Pentaskhinos in Cyprus. Beirut is a major urban center and port city, while Jdaide is a suburb located a short distance from Beirut. Pentaskhinos, in Cyprus, serves as a key landing point for multiple submarine cables, making it a hub for regional connectivity. The cable's route spans the eastern Mediterranean, a corridor characterized by dense cable activity due to its strategic importance for Europe-Middle East telecommunications.
Why it was built and what it carries
The CADMOS cable was constructed to provide reliable international connectivity between Lebanon and Cyprus, facilitating telecommunications and internet services. At the time of its commissioning in 1995, Lebanon was seeking to modernize its telecom infrastructure and expand its international reach. Cyprus, already a regional hub for submarine cables, offered an ideal landing point for such connections. While the cable's current traffic profile is not publicly disclosed, it likely carries a mix of voice, data, and internet traffic, complementing newer systems in the corridor.
History: what can be established
GeoCables records the CADMOS cable as ready for service in 1995. No conflicting dates from industry sources have been identified, so this year is presumed accurate. The cable has been operational for nearly three decades, a testament to its durability and the ongoing demand for connectivity in the region. Ownership is shared among a diverse consortium of telecom operators, reflecting the collaborative nature of submarine cable projects in the Mediterranean.
Capacity and technology
Publicly available information does not disclose the design capacity, fiber pair count, supplier, or specific technology of the CADMOS cable. Without operator documentation, attributing these details would be speculative. Given its commissioning year, the cable likely employs older optical technologies compared to newer systems, but its continued operation suggests periodic upgrades or maintenance to meet evolving demands.
Latency: the physics
The theoretical one-way light propagation latency over CADMOS's 230 km wet segment is approximately 1.1 ms, with a round-trip time (RTT) floor of 2.3 ms. However, real-world latency is higher due to factors such as land tails, terminal equipment, and routing complexities. Live measurements from remote probes indicate a minimum RTT of 91.3 ms and an average of 132.8 ms between Pentaskhinos and Jdaide over 107 checks. These figures reflect the full internet path, not the cable itself, and highlight the impact of terrestrial networks and routing inefficiencies.
Redundancy: what happens if it breaks
The CADMOS cable operates in a corridor with multiple alternative systems, including CADMOS-2, MedNautilus Submarine System,
POSEIDON, TE North, and
UGARIT. In the event of a cable fault, traffic can be rerouted through these alternatives, minimizing disruption. Repairs to submarine cables typically involve specialized ships equipped with cable-laying and retrieval equipment. Given the relatively short length of CADMOS, repair logistics would likely be simpler than for longer transoceanic systems.
Bottom line
- CADMOS is a 230 km submarine cable connecting Lebanon and Cyprus, operational since 1995.
- Landing points include Beirut and Jdaide in Lebanon, and Pentaskhinos in Cyprus.
- Ownership is shared among eight operators, including Cyta, Sparkle, and the Lebanese Ministry of Telecommunications.
- Key technical details such as design capacity and fiber pairs are not publicly disclosed.
- Theoretical latency is ≈ 2.3 ms RTT for the wet segment; live measurements show significantly higher values due to routing complexities.
- Redundancy is provided by multiple alternative cables in the same corridor.