Alex,

Very simple, 1.28 TB is the maximum capacity which is not required at the moment. Using a technology called DWDM (Dense Wavelength Division Multiplexing) "

Definition: In digital signal processing, DWDM is a technique for increasing the bandwidth of optical network communications. DWDM allows dozens of different data signals to be transmitted simultaneously over a single fiber. To keep the signals distinct, DWDM manipulates wavelengths of light to keep each signal within its own narrow band.

DWDM is a more cost-effective alternative to Time Division Multiplexing (TDM). Electrical engineers often use a motorway analogy to explain the difference between the two. TDM relates to traffic flow on one lane of the motorway. To increase the throughput of autos, one can increase their speed, that is equivalent to time multiplexing. DWDM, on the other hand, relates to the number of lanes on the motorway. Another way to increase auto throughput is to add more travel lanes, that is equivalent to wavelength multiplexing."


There's therefore no need to light up the entire capacity, if there's not capacity or demand, they'll light up in incremental dozes to match demand.

Hope you find this helpful.


Kiania D.




On Sat, Jul 25, 2009 at 8:34 PM, Gakuru Alex <alexgakuru.lists@gmail.com> wrote:
ok, this is just a gut feeling..

"SEACOM has completed and commissioned its 1,28 terabits per second
(Tb/s), 17, 000 kilometres"

yet at launch "Attendees at all launch events experienced the
high-speed capabalities took place through a one-gigabit-per-second
live international connection at all locations."

http://www.seacom.socialmediarelease.co.za/

see also: http://whiteafrican.com/2009/07/23/reactions-to-seacom-going-live-today/

Questions:
1) Why was it that only 1 GB/s at all launch location if they had 1.28
Tb/s capacity?
2) Could they have just purchased some temporary 1 GB/s from
satellites, pumped it to completed segments for the launch?
3) Were we taken for a ride thus you guys that stayed up all night
pinging... pinging.. and pinging... you were fell for it?

oh no, I hope I am wrong...

Alex
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