I would like to install a new optical communication system, poin to point, I just want to ask, does every terminal site need a OSC card?
It depends on what cards you're using and what your company's standards are for 6500 deployments. For example, if you were to use the NTK554BA OSC card and only have two directions where you want OSC, you could have the OSC for both directions on the same card. However, depending on your requirements and standards, you might want to have a separate OSC card per direction for hardware redundancy. That way if the card fails, you don't lose the OSC for both directions.
Hi Lukman, welcome to the community and thank you for saying hello and introducing yourself! I'll continue to monitor your question to make sure you receive a response and will connect with other members and our SMEs to see if they can help you. Stay tuned, you'll receive a response soon.
Hi Heather Ausmus,
Thanks for your supporting, Nice to meet you.
Strictly speaking, no, you don't need an OSC at each terminal site but it's very dependent on how you plan to manage the nodes. If you're not going to have management access to the 6500 through a DCN or GCC, then you may want to have OSC for management visibility. You might want to have a read through the Data Communications Planning andUser Guide for the software version you're running on the shelf to look at some of the different ways you can configure the management connectivity.
OSC is also useful for things other than management. For example, it can be used to help tell the difference between a fibre cut and a card failure at a remote site based on the alarms that are raised.
Hi Chelsi Doyle,
many thanks for your explanation, so if I am going to have management access to the 6500 through a DCN, let say configuration like this :
site A <-> site B <->site C, site B is terminal site (not line amplifier site) that connected to both site A and site C.
At the site B, so We need 2 OSC cards for each direction, one OSC card facing to the site A, one OSC card facing to the site B. is it true?
thanks a lot for the answer Doyle, Now I am understand.
You're welcome! I'm happy I could help.
Couple more things to add here... Remember some Ciena line modules (SRA raman amplifiers, ESAM...) also host an integrated OSC (using SFP on port 2). So, maybe you don´t need a dedicated OSC card for every deployment.
Also, OSC is not only used for management purposes (DCN).
The OSC is a shared 155Mbps between the WSC (wayside channel, an "ethernet extension" port), and the comms and signaling.
So, OSC is also used to trigger alarms regarding the optical line (Optical Line Fail is using OSC + AMP power levels) and to provide communication between DOCs to monitor and equalize the channels across the network.
This communication between DOCs can be done OOB, if not using OSCs on the network, but depending on external routing and bandwidth you may experience some slow response on channels equalization and fault recovery.
thanks Renato Borges do Couto for your additional information..
I am currently working on a hub and spoke 8700 network with 6500 amps at the hub and the (4) spokes (basically (4) point-to-point links).
We are managing the 8700's in-band, but thankfully have OSC's for out of band management of the 6500 amps. We initially were going to manage the 6500 in-band as well, but if we lost the 8700 management (which we did a few times), we would have no way to get to the remote 6500, and installing this network would have required a lot more driving.
Another big advantage of an OSC for a non-DOC network like the one I am working on, is if you have a fiber cut, the OSC will help start up both amps automatically once the fiber gets repaired. If you don't have an OSC, you have to drive to both sites to manually start the amps after the fiber is repaired.
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