Please enable JavaScript.
Coggle requires JavaScript to display documents.
Sea Cables: 2.2.7 - Coggle Diagram
Sea Cables: 2.2.7
Background:
99% of data transmitted via
Installed by cable laying boats
life expectancy: 25 yrs
Less expensive and more reliant than satellites
750,000 miles of cables
Japanese Tsunami 2011:
Cables damaged - slowed/stopped comms between US and Japan
Damage offshore takes time to identify and address problem
Aftershocks slowed repairs
Back-up cables used in short-term
China Telecomm corp made emergency repairs
Location:
laid on flat sea beds - avoiding coral reefs & shipwrecks
Only govs & comps know exact location
Avoid common routes
International Management:
Laws and regs set out in UNCLOS - legal framework for cable laying set out there
UNCLOS:
Article 2: permission and consent to lay submarine cables
Possibility for states to set conditions regarding track and dimensions
Laying of cables in territorial waters (12 nautical miles from base line) = under states jurisdiction
Innocent passage may be restricted to protect cables
Defintion:
Means of comm by laying cables on the sea bed between 2 terminal points
Typhoon Morakot 2009 - severed 6 undersea cables linking Asia & Europe - took 2 months to repair 5 cables