North American Network Operators Group

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Re: exchange point media (was: Re: MAE-EAST Moving? ...)

  • From: Alex Bligh
  • Date: Thu Jun 15 10:14:02 2000

> i have been suggesting a DACS for many years.  then all one needs is one
> channelized oc48 and it's fat city.

As passive DWDM becomes dirt cheap, having a loop carrying to a
redundant optical (wavelength) cross-connect has advantages, like
you can bilaterally upgrade your peering line cards without having
to bother to inform / be bothered by the exchange point (remember
MAE-ATM). I can't see why people would want to put in less than
an OC-3. n x OC-3 + passive DWDM is (I believe) cheaper than OC-48
channelized (per bit per second) for many values of n (i.e. spreading
the DWDM cost across many OC-x's.) - & this will last until 
n x parallel OC-192 is insufficient for bilateral cross connect. By
the time anyone listens to your (good) DACS idea, 2.4Gbps (total)
won't be enough.

Alex Bligh
VP Core Network, Concentric Network Corporation
(formerly GX Networks, Xara Networks)