* [Starlink] Blog on Tonga cable
@ 2022-02-28 23:11 Ulrich Speidel
2022-03-01 17:12 ` Michael Richardson
0 siblings, 1 reply; 3+ messages in thread
From: Ulrich Speidel @ 2022-02-28 23:11 UTC (permalink / raw)
To: starlink
Shameless self-promotion: For those interested - this is kind of a
wrap-up of my seminar last week:
https://blog.apnic.net/2022/03/01/when-volcanoes-go-bang-submarine-cables-do-what/
--
****************************************************************
Dr. Ulrich Speidel
School of Computer Science
Room 303S.594 (City Campus)
The University of Auckland
u.speidel@auckland.ac.nz
http://www.cs.auckland.ac.nz/~ulrich/
****************************************************************
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Starlink] Blog on Tonga cable
2022-02-28 23:11 [Starlink] Blog on Tonga cable Ulrich Speidel
@ 2022-03-01 17:12 ` Michael Richardson
2022-03-01 21:53 ` Ulrich Speidel
0 siblings, 1 reply; 3+ messages in thread
From: Michael Richardson @ 2022-03-01 17:12 UTC (permalink / raw)
To: Ulrich Speidel; +Cc: starlink
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Looking at the diagram in the blog entry, I see how Australia/NZ<->Hawaii
cable crosses the Tongatupu/Suava cable.
How does cable repair work when there is another cable "on top"?
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* Re: [Starlink] Blog on Tonga cable
2022-03-01 17:12 ` Michael Richardson
@ 2022-03-01 21:53 ` Ulrich Speidel
0 siblings, 0 replies; 3+ messages in thread
From: Ulrich Speidel @ 2022-03-01 21:53 UTC (permalink / raw)
To: Michael Richardson; +Cc: starlink
Usually, you would cut either side of the cable on top and then put the
splice on top of that cable and leave the cut piece on the seafloor.
Pulling out from underneath would likely cause damage to the cable on
top. That said, damage close to crossover sites is very rare: For one,
damage to cables in deep water is actually a rare event - many systems
run for decades without a fault - and most cable systems have few if any
crossover points.
In this case, the Hawaiki cable was actually laid after the Fiji-Tonga
cable, so Hawaiki is on top, however the recent damage on the Fiji-Tonga
cable was a significant distance to the east of Hawaiki, so it wasn't
impacted. In fact, there are plans for a Hawaiki spur to Tonga's
northern island group of Vava'u (and microwave links from there to
Ha'apai and down to Tongatapu / 'Eua).
On 2/03/2022 6:12 am, Michael Richardson wrote:
> Looking at the diagram in the blog entry, I see how Australia/NZ<->Hawaii
> cable crosses the Tongatupu/Suava cable.
> How does cable repair work when there is another cable "on top"?
--
****************************************************************
Dr. Ulrich Speidel
School of Computer Science
Room 303S.594 (City Campus)
The University of Auckland
u.speidel@auckland.ac.nz
http://www.cs.auckland.ac.nz/~ulrich/
****************************************************************
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