Anyone having any fallout from:
Nanogers,
We are looking for advice/experience from folks who has used small 6-8
Wavelength DDWM.
Also what are the pros and cons of CDWM and DDWM?
Application; 5 Mile Dark Fiber between two carrier neutral hotels in SF.
All help is appreciated and results will be shared if requested.
thanks
arman
Nanogers,
We are looking for advice/experience from folks who has used small 6-8
Wavelength DDWM.Also what are the pros and cons of CDWM and DDWM?
Application; 5 Mile Dark Fiber between two carrier neutral hotels in SF.
All help is appreciated and results will be shared if requested.
Arman,
I think the biggest difference between small DWDM and CWDM is how much
growth room you need.
If you need 8 wavelengths (possibly 16 is still called CWDM but I doubt it)
you can stay on the CWDM side. The lasers and the gear is generally cheaper.
With DWDM gear everything seems to be more expensive, but you get a lot
more control as the electronics governing the chassis' tend to be much more
advanced. On a short run like that, many advanced features like all-optical
amplification and such are not necessary. I am not aware of any all-optical
CWDM amplifiers yet. (for example).
If you are planning more than just 1 DF run, you could buy the less
expensive solution and just swap it out when you need something more and use
the CWDM solution somewhere else.
If you have decent/modern fiber, you should be able to comfortable signal
8 waves x 1G or 8 x 2.5G (full duplex). Some DWDM gear will let you double
that on just 8 colors by going full duplex on each fiber (each thread).
So its a question of how much BW you need and how much you want to pay
for right now.
(If I am wrong, someone please correct me).
Hope this helps, let me know what you decide.
Deepak Jain
AiNET
Deepak Jain writes:
[a response with excellent pieces of advice on CWDM vs. DWDM.]
If you are planning more than just 1 DF run, you could buy the less
expensive solution and just swap it out when you need something more and use
the CWDM solution somewhere else.
Yes. What we often do is buy a single pair of fiber (which happens to
be the smallest amount you can get) and use a bi-directional optical
system (CWDM or DWDM). So we have one of the two fibers free for a
later upgrade (or another useful purpose).
[...]
So its a question of how much BW you need and how much you
want to pay for right now.
An excellent management summary of CWDM vs. DWDM 