BOOM! there goes WorldCom

Thu Jul 17 01:31:05 UTC 1997

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.

Tony

> 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).
> 
> 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.
> 
> -rb
> 
> 
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------------------------------------------------------------------------------
Tony Pardini
Systems Engineer
CompuNet, INC.
tony at cmpu.net
pgr 2145817737