4 ms·
You will notice that almost all the cables are laid out in a ring shape. For example, check out the TAT-14 cable: https://en.wikipedia.org/wiki/TAT-14#mediaview
by runeks 12y ago
You will notice that almost all the cables are laid out in a ring shape. For example, check out the TAT-14 cable: https://en.wikipedia.org/wiki/TAT-14#mediaviewer/File:Map_TAT-14.png https://en.wikipedia.org/wiki/TAT-14#mediaviewer/File:Map_TA...
If only a single cable break occurs, every point is still reachable from every other point -- the worst thing that happens is that ping times might increase because the packets will have to travel a longer route.
This layout is called a self-healing ring: https://en.wikipedia.org/wiki/Self-healing_ring https://en.wikipedia.org/wiki/Self-healing_ring
- dfox 12y agoAs typical L2 technology for such cables is SDH/SONET, the difference in latency after single ring failure tends to not be noticeable for normal IP traffic.
- runeks 12y agoInteresting. Can you expand on this? How is that possible? If we take the TAT-14 example again: https://en.wikipedia.org/wiki/TAT-14#mediaviewer/File:Map_TAT-14.png https://en.wikipedia.org/wiki/TAT-14#mediaviewer/File:Map_TA... How will the ping times not increase dramatically from Bude (UK) to Saint-Valery-en-Caux (FR) if the connection between them breaks?
- mikeyouse 12y agoThe total length of the cable is 'only' 15,428km. So the maximum one-way latency between any two points is only ~70ms assuming 0.7C. You'd definitely notice if you were gaming, but probably not if you were watching YouTube.