Cable power feed equipment
technology
The high-voltage direct-current supply, standing in a room at each end of a cable, that keeps the repeaters on the seabed alive. It is a constant-current system rather than a constant-voltage one: the shore stations drive a fixed current — typically on the order of one to two amps — through the copper conductor that runs the length of the cable, and each repeater takes the voltage drop it needs from that current as it passes. Published descriptions put working voltages in the range of about 10 to 15 kV, and on the longest systems the two ends share the load, each feeding roughly half the cable so that neither has to hold the full potential. Two consequences matter for this Journey. A submarine cable is not a passive object that merely lies there — it is continuously energised infrastructure, and the sea itself is the return path, so a cable that is cut loses power on the far side of the break as well as light. And the power problem, not the optics, sets the practical ceiling on how many fibre pairs a very long cable can carry, which is why capacity growth on the longest routes has depended as much on making amplifiers more efficient as on making lasers better.
A technology is not a place. Drawing it on a map would assert something about the world that no stored fact supports.
Read in · 1
Evidence · 1
Timeline
No dated observations are stored for this object. Atlas shows what was observed and when — it does not infer a history.
Connections · 1
- The cable landing stationlocated_in
Assembled narrative · 1
Assembled from 15 blocks · 1 evidence · 16 related
- Story
- The high-voltage direct-current supply, standing in a room at each end of a cable, that keeps the repeaters on the seabed alive. It is a constant-current system rather than a constant-voltage one: the shore stations drive a fixed current — typically on the order of one to two amps — through the copper conductor that runs the length of the cable, and each repeater takes the voltage drop it needs from that current as it passes. Published descriptions put working voltages in the range of about 10 to 15 kV, and on the longest systems the two ends share the load, each feeding roughly half the cable so that neither has to hold the full potential. Two consequences matter for this Journey. A submarine cable is not a passive object that merely lies there — it is continuously energised infrastructure, and the sea itself is the return path, so a cable that is cut loses power on the far side of the break as well as light. And the power problem, not the optics, sets the practical ceiling on how many fibre pairs a very long cable can carry, which is why capacity growth on the longest routes has depended as much on making amplifiers more efficient as on making lasers better.
- Knowledge
- Cable power feed equipment
- The cable landing station
- Connections
- The submarine optical repeater
- The cable landing station
- The submarine fibre-optic cable
- Cable power feed equipment
- Porthcurno cable station
- The Valentia Island cable station
- The Heart's Content cable station
- Evidence
- Supports the cable construction figures in this pack: unarmoured deep-water types of roughly 17–20 mm diameter, armoured shore-end types up to about 50 mm, weights of about 0.7 kg/m unarmoured to 4.8 kg/m double-armoured, and burial to a typical one to three metres. V55 verification basis: retrieved in summary only; www.iscpc.org is blocked to this session, and no manufacturer datasheet was opened. Every figure is a class range, not a specification for a named cable.
Observed changes · 0
No public Signals are attached to this object. Signals show what changed and when it was observed — never a direction or a rank.
Actions
/atlas?object=TECH_POWER_FEED_EQUIPMENT&experience=TECH_POWER_FEED_EQUIPMENT