On Sat, 4 Jun 2011, Keegan Holley wrote:
I'm struggling with a use for DWDM optics. I understand the concept of
DWDM/CWDM and phase shifting to create more links over a single fiber. Once
that is done the ASIC/FPGA bandwidth allocated to the port remains the same,
correct? So if I create multiple 1G connections on a single port with these
magic sfp's am I still limited by the 1g/2g chip in the device. Are all the
logical connections forced to be sub-rate? I know the larger equipment
handles this differently, so I'm only concerned with the 3750/3560 size
boxes.
Hmm, I may be misunderstanding - but I think you are misunderstanding how
DWDM tuned optics works. A 1g or 10g DWDM optic is still a singe 1 or 10
interface. It's just that that transmit laser is tuned to a channel (i.e.
1546.12).
Router#sh int tenGigabitEthernet 7/1 | inc media
Full-duplex, 10Gb/s, media type is DWDM-46.12
The reason you may need this is to connect this port directly to a
(R)OADM. There are (at least) two ways on the DWDM transport side to
handle this:
a) Use a *sponder (transponder = 1:1, muxponder = n:1, etc). You can use
'grey' optics now (i.e. good ole SX/LX etc). These cards on the DWDM side
are expensive though.
or
b) Buy DWDM optics, and go directly into the mux/demux on the DWDM.
We are doing option b) in parts of our network because the cost of a) was
too much, and these links aren't going to do any moving around or going
away any time soon.
Again, apologies if I've misunderstood you.
--
Brandon Applegate - CCIE 10273
PGP Key fingerprint:
7407 DC86 AA7B A57F 62D1 A715 3C63 66A1 181E 6996
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