09-04-2017 11:19 PM - edited 03-01-2019 05:22 PM
Hi everyone!
Wanted to know something about DWDM technology. For example, if we use 10G SFP+ DWDM transceiver, does it mean that it can handle multiple 10G channels? Up to what speed and distance it can practically provide?
Thanks!
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09-05-2017 12:02 AM - edited 09-05-2017 03:57 AM
A given DWDM transceiver (Cisco or otherwise) only handles a single 10 Gbps channel at at time.
Cisco offers two general types - fixed and tunable. All the various models are shown on the data sheet here:
With fixed you decide which channel you require for the transceiver and specify it when purchasing. Tunable allows you to control the wavelength via software configuration on the router. See the following discussion for some more info on that feature:
https://supportforums.cisco.com/t5/optical-networking/dwdm-sfp10g-c-tunable-optic/td-p/2684243
As far as distance, the transceiver capabilities are based on your optical link loss budget and some other factors such as dispersion. As transceivers, they are used on the input of a DWDM system and typically intra-data center if not intra-rack. The output is the link where distance generally comes in to play. It's something you would need to work with your SE on to get a detailed and verified answer. Since these cost about US$20,000 per transceiver (list price), it's something you want to enter into only after due diligence.
09-05-2017 03:37 AM - edited 09-05-2017 03:39 AM
That's what's know as "marketing math". It works something like this:
Populate your routers with 32 transceivers all on different channels feeding a DWDM system. The DWDM has 32 input channels and one aggregated output. 32x10 = 320 Gbps.
09-05-2017 12:02 AM - edited 09-05-2017 03:57 AM
A given DWDM transceiver (Cisco or otherwise) only handles a single 10 Gbps channel at at time.
Cisco offers two general types - fixed and tunable. All the various models are shown on the data sheet here:
With fixed you decide which channel you require for the transceiver and specify it when purchasing. Tunable allows you to control the wavelength via software configuration on the router. See the following discussion for some more info on that feature:
https://supportforums.cisco.com/t5/optical-networking/dwdm-sfp10g-c-tunable-optic/td-p/2684243
As far as distance, the transceiver capabilities are based on your optical link loss budget and some other factors such as dispersion. As transceivers, they are used on the input of a DWDM system and typically intra-data center if not intra-rack. The output is the link where distance generally comes in to play. It's something you would need to work with your SE on to get a detailed and verified answer. Since these cost about US$20,000 per transceiver (list price), it's something you want to enter into only after due diligence.
09-05-2017 02:10 AM
09-05-2017 03:37 AM - edited 09-05-2017 03:39 AM
That's what's know as "marketing math". It works something like this:
Populate your routers with 32 transceivers all on different channels feeding a DWDM system. The DWDM has 32 input channels and one aggregated output. 32x10 = 320 Gbps.
09-05-2017 03:49 AM
09-05-2017 03:56 AM
Regarding DWDM inputs, there are many forms. Depending on the DWDM system they can be as low speed as copper T-1/E-1 inputs.
When talking about 10 Gbps Ethernet inputs, yes they will generally be transceivers matching the input specifications of the given DWDM system. The overall system usually has a fair amount of complexity and Cisco (and its resellers) offer design validation services to get all that straight during the planning and design phase.
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