iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Subsea cables carry data between countries through optical fibres on the ocean floor. But a cable is not a passive wire that plugs directly into the public internet: it is a complete system with underwater equipment, shore transitions, terminal equipment and terrestrial network connections. At each coast, a landing station turns the undersea transmission path into usable capacity for operators, backhaul providers, data centres and other networks.
The route is therefore a chain: an operator network, terrestrial fibre to the coast, a landing-station terminal, the wet cable system, a second landing station and terrestrial networks at the destination. Landing-station location, access arrangements and the diversity of onward routes determine how useful and resilient that ocean crossing is.
What a subsea cable system actually includes
The US Federal Communications Commission (FCC) defines a submarine cable as an electrically powered system linking two or more land-based terminal cable landing stations. That definition matters because “the cable” includes more than the fibre lying underwater. It includes wet and dry segments and the equipment needed to operate and maintain the system. The FCC’s Technical Appendix on Submarine Cable Systems describes the underwater portion as typically running between beach manholes and notes that it can contain repeaters and branching units.
| Part of the system | What it does |
|---|---|
| Terrestrial network | Carries traffic from an operator, data centre or other network to the coast, and from the destination coast onward to users and services. |
| Landing-station terminal equipment | Terminates the submarine transmission system and provides the controlled handoff to land-based networks. |
| Beach manhole and shore route | Provide the protected transition between the underwater cable and the land cable route. |
| Wet cable | Contains optical fibres that carry communications data across the seabed. |
| Repeaters | Underwater equipment that can be installed along a long cable span to support optical transmission. |
| Branching units | Underwater network elements that can allow a system to connect to more than two landing points, where the design includes them. |
This architecture is not identical for every project. Some systems have only two principal landings; others include additional landings or branches. The FCC diagram is illustrative rather than a universal blueprint.
#1 Best Overall
- Optical digital audio cable: Perfect for equipment with a TOSLINK interface (OPT In / OPT Out or S/PDIF In / S/PDIF Out). TOSLINK connector to TOSLINK connector (F05 connector)
- Versatile: Ideal for transmitting crystal-clear digital audio from your TV, video game console (PS3/PS4/Xbox One), DVD/Blu-ray player, or TV streaming box to a soundbar, amplifier/amp, stereo/Hi-Fi system, D/A converter, and more
- High-End: This metal-free fiber optic audio cable, featuring a fully flexible PVC jacket, is entirely immune to electrical interference. Each cable undergoes multi-stage testing during manufacturing to ensure maximum product quality and durability
- 24K gold-plated connectors: Corrosion resistant gold plating keeps connectors clean. And because these cables are fiber optic, they provide 100 % signal transmission with 0 % loss
- No risk: 36 months manufacturer warranty
The journey from a network to another country
A packet does not travel from a laptop straight into an ocean cable. It moves through several controlled handoffs.
- Traffic enters an operator or enterprise network. A customer request, cloud connection or other data flow first reaches the network that serves the user. That network decides which available path can carry the traffic toward its destination.
- Terrestrial fibre carries the traffic toward the coast. The network uses land-based routes to reach a coastal cable facility. The distance and cost of this backhaul affect which landing station is practical for an operator or data-centre customer.
- The landing station’s terminal equipment receives the handoff. At the station, the submarine cable system is terminated and connected to terrestrial transmission equipment. The station is the controlled interface between the wet system and the networks on land, not an independent version of the internet.
- The signal crosses the shore transition. The land cable route leads toward a beach manhole, where the dry plant meets the wet segment. The exact civil layout differs by site, but the manhole and shore route form the physical transition from land to sea.
- Optical fibres carry the data through the wet segment. The underwater system can include repeaters along the route and branching units where the design requires additional connections. These elements are part of the engineered transmission system, rather than accessories that a household or ordinary office can connect directly.
- A second shore transition reaches the destination landing station. The cable comes ashore through another beach manhole and land route. The receiving station’s terminal equipment terminates the submarine transmission path on that side.
- Terrestrial networks deliver the traffic onward. From the destination landing station, operators use backhaul, points of presence, data centres, internet exchanges or other network facilities to reach the intended service and user. The final route can cross several networks after the cable journey ends.
Because the ocean crossing is only one segment, a country can have a cable landing and still need substantial terrestrial capacity to reach its population centres, cloud regions or other operators.
Why the landing station is the critical gateway
It turns submarine capacity into usable network access
A fibre pair on the seabed is not useful to an operator until the system is terminated and connected to equipment on land. The landing station provides that controlled termination and the physical facilities for onward interconnection. It is where capacity can meet an operator’s network, a backhaul provider, a point of presence or a data-centre environment.
Recommended Free Tools
Rank #2
- Please REMOVE the end protective caps before using the cable.
- IN THE BOX: 6-foot digital optical audio Toslink cable.
- CLEAR AUDIO: Multi-channel, fiber-optic digital audio output; corrosion resistant gold-plated connectors and buffer tubing for optimal signal transfer.
- DURABLE: Lightweight, flexible cable with a rugged PVC exterior and removable rubber tips that protect the cable when not plugged in; remove before using.
- CONNECTS DEVICES: Quickly connects a sound bar, CD player, Blu-Ray player, game console, or other device to an audio system or TV.
The FCC notes that points of presence and internet exchange points may be located inside a landing station or data centre, and that a data centre can itself serve as a landing station. Those are possible arrangements, not features present at every site. What is consistent is the station’s role as the place where the submarine system meets terrestrial networks.
Its location determines terrestrial reach
Two landing points can provide similar ocean access but very different practical connectivity. A station near major fibre routes, data centres and carrier facilities may offer more economical onward paths than an isolated site that requires long or limited backhaul. The landing point also influences how quickly an operator can reach customers and interconnection hubs once traffic comes ashore.
Access is a commercial and regulatory issue
Using a landing station is not simply a matter of plugging in a patch cable. An operator may need colocation space, cross-connects, backhaul links or managed services, subject to contracts and local rules. Qatar provides a specific example: in an announcement dated July 20, 2026, its Communications Regulatory Authority said a new access regulation covered colocation, cross-connect arrangements, backhaul links and managed services. The announcement describes Qatar’s regulatory framework; it is not a global rule. See the Qatar CRA announcement for that jurisdiction’s details.
Rank #3
- 【Extra-Long 10ft Cable for Flexible Setup】iVANKY 10ft optical audio cable provides just the right length to connect your devices comfortably - no more struggling with cables that are too short. Enjoy the same pristine, lossless audio quality while having the freedom to arrange your home theater, gaming system, or audio components exactly how you want
- 【Ultra-Clear Audio Quality with Japan Toray Original Fiber Core】iVANKY optical audio cable uses Japan Toray Original Fiber Core to deliver zero-distortion, lossless audio. This toslink cable is compatible with uncompressed PCM audio and compressed 5.1 to 7.1 surround sound systems, including Dolby Digital Plus, DTS-HD High Resolution, and LPCM. This digital optical audio cable ensures a wide dynamic range for an immersive listening experience
- 【Universal Device Compatibility】This optical cable for soundbar and home theaters connects seamlessly to a wide range of devices with standard Toslink (s/PDIF, Optical) ports, such as TVs, Soundbar, Speaker, Receiver, PS4, Xbox, Blu-Ray players, and more. It’s perfect for anyone looking to enhance their audio setup with a fiber optic cable that works flawlessly across multiple devices
- 【24K Gold-plated Connectors & Superior Durability】 Unlike conventional PVC jackets, iVANKY optical cable features a high-quality nylon braided jacket that withstands over 16,000 bends, making it highly durable and resistant to breakage. The aluminum shell and 24K gold-plated connectors prevent tarnishing and maintain conductivity over time, ensuring long-lasting performance
- 【Precision Design】The precisely designed cuboid connectors of this digital optical audio cable make installation easy and secure. The flexible and lightweight nylon material ensures hassle-free handling. Additionally, removable rubber caps protect the connectors from dust and oxidation when not in use. CL3-rated, this cable is also designed for in-wall installation, providing flexibility for your setup
Routes, branches and why no single diagram fits every cable
Subsea systems can be designed with different landing counts and branching arrangements. A route may connect two countries directly, include intermediate landings, or use a branching unit to reach another shore. The practical path also depends on which operator networks buy capacity and which terrestrial facilities they use after landing.
For that reason, a map showing a cable between two coastal points does not reveal the complete internet path. It may omit domestic backhaul, interconnection facilities, alternate routes and the network that ultimately serves the user. The ITU-T design guidelines provide technical guidance for optical-fibre submarine systems, but they are not a current inventory of every cable or a guarantee that all systems share one topology.
Reliability: what damages cables and what reduces the impact
Most cited incidents are accidental
ENISA’s overview, “Dive into the Deep Sea: A View of the Subsea Cable Ecosystem,” identifies anchoring and fishing as the most common causes in the incidents it discusses. Underwater earthquakes and landslides can also cause significant damage, particularly where several cables are concentrated in the same area.
Rank #4
- Optical digital audio cable: Perfect for equipment with a TOSLINK interface (OPT In / OPT Out or S/PDIF In / S/PDIF Out). TOSLINK connector to TOSLINK connector (F05 connector)
- Versatile: Ideal for transmitting crystal-clear digital audio from your TV, video game console (PS3/PS4/Xbox One), DVD/Blu-ray player, or TV streaming box to a soundbar, amplifier/amp, stereo/Hi-Fi system, D/A converter, and more
- High-End: This metal-free fiber optic audio cable, featuring a fully flexible PVC jacket, is entirely immune to electrical interference. Each cable undergoes multi-stage testing during manufacturing to ensure maximum product quality and durability
- 24K gold-plated connectors: Corrosion resistant gold plating keeps connectors clean. And because these cables are fiber optic, they provide 100 % signal transmission with 0 % loss
- No risk: 36 months manufacturer warranty
Geographic diversity matters more than a cable count alone
A network is more resilient when it has genuinely separate routes and enough capacity to move traffic if one path fails. Several cables that run close together through the same chokepoint can share exposure even if they are owned or operated separately. Conversely, a single damaged cable does not automatically cause a countrywide outage: the result depends on alternate routes, spare capacity, interconnection arrangements and the fault’s location.
ENISA also notes that information about cable resilience, redundancy and capacity is limited. That makes broad claims such as “one cut will disconnect a country” or “multiple cables guarantee continuity” unreliable without a specific network analysis.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repairs are specialized and slow
Underwater repairs are complex and can take a long time. ENISA says they require highly specialized cable-repair ships, of which only a small number exist. A chokepoint can therefore create a repair-capacity problem: multiple faults in the same area may compete for the same vessels, equipment and suitable weather windows.
Best Value
- 【Rugged Outdoor-Grade TPU Jacket】This armored fiber optic cable features a thick industrial TPU jacket with excellent tensile strength, UV resistance, abrasion protection, and waterproof performance. Built for long-term reliability in harsh environments like snowfields, deserts, mountain ridges, tunnels, coastal zones, rooftops, factories, roadside trenches, and construction sites. Supports direct burial, conduit routing, or overhead use. Available in 5m to 300m lengths for residential and commercial deployments.
- 【Dual Armored Construction for Protection】Built with a stainless steel spiral armor tube and inner fiberglass yarns, this outdoor fiber cable provides double-layer mechanical protection against crushing, rodent chewing, sharp bending, and pulling stress. With an outer diameter of 5.0mm, it offers significantly more resistance to physical damage than standard 3.0mm fiber cables, making it ideal for direct burial, industrial campuses, outdoor conduits, and environments with heavy foot or vehicle traffic. Engineered for long-term durability in harsh conditions.
- 【Pre-Installed Pulling Eye for Easy Deployment】The cable comes pre-terminated with a swivel pulling eye kit on one end, allowing for efficient and safe pulling through conduits, ducts, bridge trays, risers, telecom manholes, and underground raceways. It eliminates the risk of fiber damage during long-distance installations. The pulling eye cover is removable and reusable, making it ideal for multi-phase construction, structured cabling, building backbone links, outdoor trench routing, industrial campuses, and FTTH deployments across large properties.
- 【OM3/OM4 High-Speed Transmission up to 100Gbps】This armored fiber optic cable uses 50/125μm multimode fiber to support high-speed Ethernet connectivity. At 850nm wavelength, OM3 supports 10Gbps up to 300m, 40Gbps up to 100m, and 100Gbps up to 70m; OM4 extends these distances to 400m, 150m, and 100m respectively. Ideal for data center backbones, enterprise LANs, telecom rooms, FTTH deployments, server farms, campus networks, SAN/NAS storage interconnects, broadcast studios, control systems, surveillance backhauls, and other high-density, high-bandwidth fiber optic infrastructure.
- 【Space-Saving Uniboot & Broad Device Compatibility】LC uniboot connectors reduce cable clutter and enable quick polarity reversal—ideal for dense patching environments. This cable supports 1G/10G/25G/40G/100G SFP/SFP+/XFP/QSFP+ modules, and integrates smoothly with Ethernet switches, routers, firewalls, ONU/OLT terminals, media converters, patch panels, NICs, NVR systems, fiber mux/demux units, and industrial control equipment. Compatible with Cisco, Ubiquiti, Mikrotik, Juniper, HPE, Arista, TP-Link, Netgear, Intel, Fortinet, Zyxel, Mellanox, Supermicro, Huawei, ZTE, Brocade, D-Link, and others.
Landing stations are part of the security boundary
The shore facility deserves attention as well as the seabed. ENISA assesses that accessing communications data at landing stations or landing points is feasible and should be treated as a threat, while direct eavesdropping on cables on the seabed is considered unlikely in its discussion. This is a risk assessment, not a claim that every landing site is insecure. Physical controls, restricted access and network-security measures at the station are important because it is where the submarine system connects to land-based infrastructure.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to compare a landing point or cable route
For a network planner, carrier or public authority, the useful comparison is not simply “which cable is longest” or “which station is nearest.” Evaluate the whole path using four questions:
| Comparison axis | Questions to ask | Why it matters |
|---|---|---|
| Route diversity | Are alternate cables geographically separate, or do they share the same coastal approach and chokepoint? | Shared exposure can make apparently different connections fail together. |
| Terrestrial reach | How readily can the station reach operator networks, backhaul, points of presence, data centres and exchange facilities? | Ocean capacity has limited value if onward land connectivity is expensive, congested or unavailable. |
| Landing access | Are colocation, cross-connects, backhaul and managed services available, and under what local terms? | Commercial and regulatory conditions determine who can use the facility and how quickly. |
| Repair exposure | Is the route exposed to anchoring, fishing, earthquakes or landslides, and what repair resources serve the area? | Physical hazards and limited repair ships affect restoration time after a fault. |
This framework also prevents a common mistake: treating a landing station’s existence as proof of abundant or resilient service. The station is an enabling gateway; the quality of the complete route depends on what is connected to it and how those connections are protected.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →What “99% of intercontinental traffic” means
The European Commission’s submarine-cable security page states that submarine data cables carry 99% of intercontinental internet traffic. That figure describes the strategic importance of the infrastructure, not the share of every country’s domestic traffic and not a measurement whose year or method is specified in the cited passage. It should therefore be read as the Commission’s published characterization, rather than as a newly measured 2026 statistic. The source is the European Commission page on the Submarine Cable Security Toolbox and Cable Projects of European Interest.
Common misconceptions, corrected
- “The cable plugs straight into the internet.” No. Terminal equipment at a landing station connects the submarine system to terrestrial networks, which then connect to operators, exchanges, data centres and users.
- “Every cable is one uninterrupted wire between two beaches.” No. A system can include wet and dry segments, repeaters, branching units and more than two landing points.
- “A landing station routes the whole internet.” No. It enables a handoff and interconnection. Routing decisions and onward delivery occur across the connected terrestrial networks.
- “Any cable cut disconnects a country.” Not necessarily. The effect depends on alternate routes, available capacity, interconnection and where the fault occurs.
- “The seabed is the only security concern.” No. ENISA identifies landing stations and landing points as places where access to communications data should be considered a threat.
- “A global cable count is a permanent fact.” No. Cable projects, landings, routes and operational status change. Counts must be tied to a dated, clearly defined source.
What readers and network operators should remember
The internet’s intercontinental links are best understood as integrated systems. Optical fibres carry data through the wet segment, but the landing station’s terminal equipment, beach manhole, shore route and terrestrial interconnections make that capacity usable. The station’s location affects reach and cost; its access rules affect who can connect; and the diversity of routes around it affects resilience.
When assessing an international connection, follow the entire chain rather than stopping at the map’s coastline: identify the submarine route, the landing facility, the available backhaul, the destination networks and the alternate paths. That is why landing stations matter as much as the cables themselves.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
