Re: Sonet protection usage

[Jonathon Plonka <jplonka () gblx net>]

I might point out that Global Crossing does lay out their paths as rings
including under sea cables.

http://www.globalcrossing.com/net_ac1.htm  for us to europe
http://www.globalcrossing.com/net_pc1.htm  for US to japan.


SOnet circuits for the most part, are set up as protected rings with full
redundancy.  Specing APS does not cost the carrier the same as two circuits
since each of the SONET circuits are speced with a full protection path.
Two circuits would end up with two working and two protect paths using up
twice as much SONET capacity.

The request for APS usually only effects the connection from the SONET MUX
to the router.

NOTE the above only applies to SONET circuits not to DWDM lambdas.

-jonp

On Wed, 26 Jul 2000 07:10:52 -0400, William Allen Simpson
<wsimpson () greendragon com> wrote:

> > Well-engineered trans-oceanic links are laid such that there are at least
> > two conduits running parallel
> > some large distance apart.
> And which are those?  I was unaware that any were laid that way.  My 
> information is dated on that topic, tho'.  (The only one I ever viewed 
> was pre-optical.)
>
>
> > Or you can run 1+1 IP Bonded interfaces and achieve the same effect ;-)
> Unless it has vastly improved since I last tried it, bonding does not 
> work well over diverse paths, due to timing differences.
>
> WSimpson () UMich edu
>    Key fingerprint =  17 40 5E 67 15 6F 31 26  DD 0D B9 9B 6A 15 2C 32

-- 
Jonathon N. Plonka
VP IP Engineering,Global Crossing
jplonka () globalcenter net