[time-nuts] Frequency over fiber (was WWV and legal issues)

Poul-Henning Kamp phk at phk.freebsd.dk
Sun Sep 2 14:45:23 EDT 2018


In message <C3C70D17-3E2D-44C6-924C-F780B2245CEB at n1k.org>, Bob kb8tq writes:

> That’s why they design a certain amount of “slack” into the structure.

As far as I know, thermal expansion and contact losses are far
bigger dimensioning factors, except for a few very active fault-lines.

At these fault-lines and/or with very important fibers, special and
site-specific precautions are usually taken.

For terrestial faultlines, the cheapest and easiest mitigation is
to cross the fault-line on poles with a slack messengerwire.

For oceanfloor faultlines, plenty of slack and an oblique crossing
is the best we've come up with yet.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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