Robert Boyle robert at tellurian.com
Mon Sep 1 19:50:46 CDT 2008

At 12:03 AM 8/31/2008, you wrote:
>Currently it is my understanding the 10 Gbps signals are carried on 
>4 x 2.5 Gbps signals that are compatible with existing CWDM and DWDM 
>equipment. There are 40 Gbps DWDM systems and 10 Gbps lasers on 100 
>Gbps and greater capacity systems. I agree with Alex's comments that 
>to have 10 Gbps on a CWDM system is to have a CWDM system of at 
>least 40 to 100 Gbps and that is very expensive today.

The only affordable CWDM 10G system I have seen although I haven't 
used it yet is a single 10G band at 1310 or 1550 with 8 additional 
2.5G bands around it. I haven't seen any 4 band 10G CWDM boxes with 
XFPs for less than $5000 yet, but I would expect them in the next 
year or two - I'm hoping anyway. I'm out of the country at the moment 
and access is a bit too slow to look it up easily now. If you need 
the manufacturer, let me know and I'll look it up when I return.


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