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Re: BOOM! there goes WorldCom
From: Anthony Pardini <apardini () cmpu net>
Date: Wed, 16 Jul 1997 20:31:05 -0500 (CDT)

On Wed, 16 Jul 1997, Ron Buchalski wrote:

Sprint uses 4 ring sonet loops.  Two backup and two active.  This way 
there is total capacity availiable in the event of a fiber cut.  The data 
just takes the reverse way around the loop on the backup path.  I believe 
they should have all the loops completed by the end of the year.


The key is to go with multiple suppliers who can guarantee diverse 
routes.  Carriers lease capacity from each other in some cases, so 
Sprint and MCI can give you circuits in the same physical fiber.

Sprint and AT&T are implementing SONET protection switching which will 
reroute circuits around fiber cuts in 50ms.  I don't know if they do it 
as a rule, or if you need to specify rerouting priority (and pay for 

It's interesting to look at a carrier's fiber map and compare it to a 
railroad map.  You'll see MANY similarities.  Railroad rights of way are 
the easiest areas to install fiber.


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Tony Pardini
Systems Engineer
CompuNet, INC.
tony () cmpu net
pgr 2145817737

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