Vandalism in Arizona Shut Down Internet, Cellphone, Telephone Service Across State | Washington Free Beacon

[Tom Azlin W7SUA]

Hi Rob,

Indeed there are two major roads and one railroad north through the 
mountains from Phoenix then several long way around loops. Plus we are 
close to I-40 north of us.  Given most of Northern AZ was without 
internet must be no CenturyLink routes along I-40 so Flagstaff and 
Prescott served by a stub? Might be that Verizon has completely 
different physical layer.

I thought that that SONET was in fact being done cheaply with folded 
loops on single cables ( stubs?) in the ground with multiple fiber 
bundles. And that some out here in the West had years ago switched to 
mesh networks since SONET to economize.

Next event was that power for most of the two counties that contain 
Prescott and Flagstaff was out for several hours last night due to major 
storm. We are getting heavy rain and snow depending on elevation out 
here. Best rain in several years.

73, tom w7sua

On 3/2/2015 5:02 AM, Rob Seastrom wrote:
>
> Tom Azlin W7SUA <tom at nilza.org> writes:
>
>> I will go check out the URL you provided to understand the physical
>> layer some more.
>
> SONET is typically built in rings, so there are two ways to everything
> with auto-failover, unless someone cheaped out and built the circuits
> non-redundant at the conduit-in-ground layer.
>
> For Internet stuff, assuming you have more than one way in and out,
> routing protocols (if properly configured, which is often a big if)
> will do the rerouting.  Capacity issues when a link is missing out of
> the equation are a separate issue.
>
> Ethernet-based services (for instance, cell tower backhaul) can be
> provisioned with some sort of layer 2 redundancy, or provisioned over
> MPLS in which case the IP routing protocols do the heavy lifting.
>
> In general, places built as a stub are built that way because of
> straight up economics.  The geography makes it more costly to build,
> but it's rare to find a place that has only one road or railroad
> (pre-made right-of-way) in and out of town.
>
> -r
>
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