Aerial Fiber: Composite Ground Wire with Optical Fiber or Optical Ground Wire (OPGW)

[David Farber <dave () farber net>]

Begin forwarded message:

From: "Mark Goldstein" <markg () researchedge com>
Date: April 14, 2009 1:20:55 AM EDT
To: <dave () farber net>, "'ip'" <ip () v2 listbox com>
Subject: Aerial Fiber: Composite Ground Wire with Optical Fiber or  
Optical Ground Wire (OPGW)

For IP if you wish:

Actually, U.S. power companies commonly use Composite Ground Wire with
Optical Fiber or Optical Ground Wire (OPGW) cables deployed aerially  
along
with their high voltage transmission lines. It's a ground wire  
sheathed with
multiple fiber strands, up to 96 unique optical fibers, maybe higher.  
Thus
incremental cost of adding on newly built transmission facilities is  
quite
modest and for existing infrastructure still relatively low cost as
deployment is overhead. Of course much safer sheathing a ground wire  
than a
high voltage line.

In the Phoenix area, Salt River Project has probably the third most  
deployed
fiber after Qwest and Cox, the incumbent phone and cable companies.  
They do
bury a small amount of it where they control federal canals and the
associated right of way for those and in strategic spur extensions to  
on net
buildings,
but primarily deploy on all 64KV and
above distribution pathways. They have a telecom revenue center within  
their
enterprise to lease use of this fiber to telecom providers under Master
License Agreements as well as place vertical assets (leasing use and
backhaul) to cellular providers at over 200 locations. You can see an
overview of their fiber deployment at
http://www.srpnet.com/telecom/telecommap.aspx FYI.

They do support their own runs into most telecom COs, cable MTCs, and
regional data centers. as well as into some commercial buildings or  
through
business parks. Additionally they will splice into the OPGW at any of  
their
transmission towers and run down the tower to a small vault at the  
base for
handoff, but getting ROW and fiber paths to the point of delivery from  
there
can still be challenging.

A number of such OPGW cables can be seen on one manufacturers site at
http://www.afltele.com/products/fiber_optic_cable/opgw_cable/ 
index.html FYI.

Best Regards,
Mark Goldstein, President
International Research Center
Voice & Fax: 602-470-0389, Skype: mark.goldstein
LinkedIn: http://www.linkedin.com/in/markgoldstein
E-Mail: markg () researchedge com, IRC: http://www.researchedge.com/
Harnessing Global Information Resources for Informed Decision Making

-----Original Message-----
From: David Farber [mailto:dave () farber net]
Sent: Monday, April 13, 2009 6:46 AM
To: ip
Subject: [IP] Re: The Smart Grid and Cybersecurity

Begin forwarded message:

From: Bjørn <bv () norbionics com>
Date: April 12, 2009 8:14:11 PM EDT
To: dave () farber net
Subject: Re: [IP] Re:    The Smart Grid and Cybersecurity

On Sun, 12 Apr 2009 16:52:36 +0200, David Farber <dave () farber net>
wrote:

> Begin forwarded message:
>
> From: Peter Swire <peter () peterswire net>
> Date: April 12, 2009 10:17:07 AM EDT
> To: "dave () farber net" <dave () farber net>
> Subject: RE: [IP] Re:   The Smart Grid and Cybersecurity
>
> Hi Dave:
>
> I took part of the weekend off, but here are some responses to
> Thomas Lord's thoughtful questions.  Format is his question then my
> response:
>
> 1. How are cost savings obtained by putting up high voltage power
> lines and fiber at the
> same time?   My naive understanding is that
> the power lines are generally strung between towers while fiber is
> usually buried.  Even if the same right of ways are used it seems
> like you are suggesting having two crews, in the same spot, at the
> same time, getting in one another's
> way.   I did find reference elsewhere to case
> in Germany where power and fiber were both buried and were buried in
> the same conduit - so I can see the cost savings there - but is that
> the plan here?

At least in Norway, fiber is spun around the high voltage line. I can
see a cost saving from installing power lines with the fibe already
integrated with the conductor instead of using crawling robots to spin
fiber around the conducor after it has been put in place.






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