[NANOG] DWDM More Details
john at internetassociatesllc.com
Fri Apr 25 17:26:07 UTC 2008
Do you want
CWDM - Course Wave Division Multiplexing - > 100 nm optical spacing 1 - 10 x 2.5 - 10 Gbps lambdas
DWDM - Dense Wave Division Multiplexing - = 50 nm optical spacing 20 - 40 x 2.5 - 10 Gbps
UDWDM - Ultra Dense Wave Division Multiplexing - < 50 nm optical spacing 40 - 80 x 2.5 - 10 Gbps
What size area do you want
CAN - Campus Area Network 1 - 5 Miles Short Optics, No amplifiers
MAN - Metro Area Network 10 - 40 Miles Medium Optics, No amplifiers
WAN - Wide Area Network 150 Miles between In Line Amplifiers (ILA) Long haul optics, EDFA or Ramiun Amps
ULHWAN - Ultra Long Haul 600 - 800 Miles between ILA, ULH optics, Ramiun Amps
What type of fiber do you want to use?
SMF, Zero dispersion, phase shifted, etc.. This one you usually cannot control fiber since it depends on who you lease or buy the fiber from.
Running the fiber cost the money.
There are now a large number of regional fiber providers with Level (3) having the "most available" dark or lite fiber nationally in the US.
Alcaltel/Lucent, ADVA, Ciena, Cisco and the Chinese are normal list of optical equipment providers and Siemens, Ericson and others.
Subscribe to Lightwave (at no charge) and look at the back issues for networks. Show up at Supercom or OFC or what is replacing them and get the latest on ROADM, full channel tunable lasers and maintenance costs.
What size of network do you want to grow to before replacing the optical link equipment including ILAs?
Most any org can cost justify a CWDM / CAN since you can add one fiber pair at a time and one lambda per fiber pair.
DWDM gear is much more expensive and is aimed at 20 to 40 lambdas per fiber for service providers while UDWDM and ULHWAN are aimed at trans oceanic links and are very very expensive.
John (ISDN) Lee
From: Scott E. MacKenzie [smackenzie at qf.org.qa]
Sent: Friday, April 25, 2008 4:00 AM
Subject: [NANOG] DWDM
Does anyone know where I can locate a list of DWDM networks deployed for
Education, Science & Research, and Commercialization?
We need to determine the practicality of DWDM use...
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