connect two locations using DWDM

Unanswered Question
May 6th, 2010
User Badges:

Hi all,

I am planing to connect two sites using cisco dwdm, the distance between them is 50 km,

i need 4 channels or 8 channels DWDM device.

i was wondering if it's possible to do that using CWDM.

any help please.


  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Tom Randstrom Thu, 05/06/2010 - 11:03
User Badges:
  • Gold, 750 points or more

It is possible to have up to 8 CWDM (GE) channels over 50km using the following products:

Additionally, if you wanted to add 8 DWDM channels (10G capable) to this same network, you can add the following solution:

I hope this helps!

inahhedammah Thu, 05/06/2010 - 11:34
User Badges:

Thank you for reply,

I feel something is missing , as my understood the input of CWDM device for instance "CWDM-MUX8A" should be optical,

so how it could be (GE).

i hope i am not out of the line.


Tom Randstrom Thu, 05/06/2010 - 11:53
User Badges:
  • Gold, 750 points or more

The input to the CWDM-MUX8A is the optical signals from an optical transceiver module (typically an SFP or GBIC transceiver module ) installed in the switch/router's trunk interface.  The output of the CWDM-MUX8A is to the fiber cable which links the sites together.

What equipment and services are you planning to transport over the CWDM equipment?



inahhedammah Thu, 05/06/2010 - 12:07
User Badges:

mm.., let's see, right now i am planing to use

  • GBICWS-G5483 as a converter .
  • CWDM-MUX8A to transfer signals over 8 channels.

what do you see ?! is it ok ?

oh ! one more thing , that means the "CWDM-MUX8A" has fiber interface, and there is

CAT5 "for instance" cable connect between the GBIC on swich/router and the fiber port, Correct ?!


Tom Randstrom Thu, 05/06/2010 - 12:17
User Badges:
  • Gold, 750 points or more

You would swap out the WS-G5483 1000Base-T GBIC for a CWDM GBIC, which has an optical output that is tuned to a specific CWCM channel.  This CWDM GBIC would then interface to the appropriate CWDM MUX-8A input port using a duplex, singlemode fiber jumper. 

See CWCM Installation Guide.

Let me know if you have additional questions.


inahhedammah Thu, 05/06/2010 - 12:36
User Badges:

Thank you very much.

basicly, i connection between the router and "CWDM  MUX-8A" might be singlemode fiber, so

i belive if i want to use the 8 channels, i will use all 1000Base-T GBIC, 8 singlemode fiber

connection+8 CWDM OADMS 1000Base-T GBIC (1470,...) , right ?

inahhedammah Fri, 05/07/2010 - 05:44
User Badges:

Thanks, now i have clear idea

I think i still need LC connecotrs,?

Is this scenario good for SAN storage extention.

Tom Randstrom Fri, 05/07/2010 - 06:29
User Badges:
  • Gold, 750 points or more

The CWDM-MUX8A has LC style connectors and the GBIC optical transceivers have the SC style connector.  So your fiber optic jumpers will need to have one end SC/UPC and LC/UPC on the other end.

If some of your switches/routers use pluggable SFP optical transceivers (instead of GBICs), these devices use LC style connectors.  So, in this case, your jumpers will be LC to LC.

Suitability for storage applications depends on the services to be transported and you future needs.  1G and 2G services can be transported over this CWDM network using the CWDM GBIC/SFPs.  I am not seeing CWDM/DWDM GBIC/SFPs for higher speed 4/8G FC & 10 FC services.  10GE can be added to this network with the EWDM solution, which adds a pair of DWDM filters to the CWDM filters and also adds optical amplification for the DWDM channels (due to the distance).

The following Cisco papers outline the transport options for storage applications.

Transport Options for Data Center Optical  Interconnection

Storage Networking over a Metro Network


This Discussion