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Science Forum Index » Optics Forum » terrestrial fiber diversity?
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| Trs80 |
 Posted: Fri Jan 18, 2008 1:14 am |
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Is there a spec or standard that recommends the distance between fibers
primary and secondary fibers to prevent a fiber cut of both say by a
backhoe?
any thoughts? |
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| Louis Boyd |
| Posted: Fri Jan 18, 2008 9:59 am |
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Trs80 wrote:
Quote: Is there a spec or standard that recommends the distance between fibers
primary and secondary fibers to prevent a fiber cut of both say by a
backhoe?
any thoughts?
In the telephone industry it's common to build fiber optic systems in
loops, community to community with each circuit returning to the point
of origin. That also makes circuit testing easy. If there is a cut
the traffic simply takes the alternate path already in place. Common
sense goes a long way in preventing single point outages. Not all
single events are single point such a when a flood or earthquake damages
multiple locations.
Bluestake is the best protection against cable cuts from digging. In
most places there are heavy fines for digging without adequate cable
location even if the backhoe doesn't damage anything.
Spacing? How far can a backhoe dig in the time it takes you to diagnose
a cut location and dispatch someone to physically stop them. In a
remote rural area with easy digging it could be hundreds of feet. More
for a cable plow crossing your path.
Economics is always a consideration. How much does the diversity
circuit cost compared to the cost of an outage? That varies radically
depending on the traffic on the circuits. Sometimes it makes sense to
backup only a few most critical circuits with microwave or satellite
instead of an alternate fiber route. |
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