Community Broadband Networks 
Recent Blog Headlines
About Al Bonnyman
"What's this blog thing about, anyway?"
Partial list: power utilities with fiber

Sponsored by:
Fiber Planners Inc.
Designers of fiber networks for electric utilities and communities.

News and comments on community broadband networks, the communities deploying them and the technologies that support them. Published by Denise Frey and Al Bonnyman.

Enter your email address below to subscribe to Community Broadband Networks:

powered by Bloglet
If the subscription form returns an error, send an e-mail to

Index of 2100 previous posts since March 2003

  Search help

Send news updates and feedback to:
Al Bonnyman

Sponsored by:

Fiber Planners logo

Some of the topics we cover:

  • ADSS cable technology
  • OPGW cable technology
  • Fiber to the home
  • Powerline broadband
  • Fixed wireless broadband
  • Other power utility telecom topics
  • Innovative fiber deployment technologies

Recent headlines:

Links to other blogs and free-form news sites:

Other links:

Note: comments posted are strictly the opinion of the poster and not necessarily those of Fiber Planners Inc. or any other posters.


Wednesday, February 25, 2004


Canada: "Fibre firm takes telecom out of the trenches"

"A Vancouver company thinks it has the solution to solving last mile headaches without tearing up the downtown core. TeraSpan Networks has developed a vertical inlaid fibre system of trenchless deployment. Instead of tearing up the street a saw cut is made down the asphalt or a crack cut in the sidewalk, and the cable is dropped in and then filled over."

This is a good article on TeraSpan's inlaid cable system for placing fiber cable in roadways and sidewalks with out costly and disruptive trenching or directional drilling.

Sprint Canada is using the system and likes it despite some critics' concerns that these installations are not as robust as fiber cable buried deeper in conduits. As the Sprint manager points out, the only real protection against interruptions is a truly redundant system laid out in a ring topology. (Note, the other cable has to follow a different route -- it can't just be a few ducts away in the same duct bank, a shortcut sometimes taken.)

A backhoe digging in the wrong place is usually going to take out a cable whether it's a few inches into the road surface or two feet below it. (A much safer exception to this would be fiber cable placed really deep below other utilities, but that's usually only done in conjunction with a sewer system deployment)

30 years ago, buried cable installations were more reliable than aerial installations, but this is no longer true, especially in big cities where there is so much utility construction. Buried cable installations are certainly more expensive. In extreme cases, they can cost hundreds of thousand of dollars per mile in places like Manhattan.

By substantially reducing costs, the TeraSpan system may actually facilitate better reliability by making it easier to cost-justify and deploy redundant fiber. The fiber cable itself only costs only a few thousand dollars per mile depending on fiber counts.


Add email subscriptions to your blog with Bloglet! Weblog Commenting by Listed on Blogwise
The Octopus Files
My Popdex Game Profile
Technorati Profile Creative Commons License
This work is licensed under a Creative Commons License.

This page is powered by Blogger.