Asking about optical interface

[jinhong.im]

Hello folks,

I have a question about optical interface.

I am reading a cisco press book related optical transmission. In the book I have seen many optical interfaces that are OC-3/OC-3c, OC12/OC-12c, STS-3C, STS-12c and something like that.

My question is what is the "c" in the end of the interface name. What is different between OC-3 and OC-3c, STS-3 and STSc?

Please anyone give me advice.

Thanks

Jinhong

[pkhatri]

Hi,

The 'c' refers to concatenated. For example, an STS-3c signal consists of 3 concatenated STS-1 signals.

Pls refer to the following link with a good description of Sonet and concepts such as concatenation:

http://certcities.com/editorial/Features/story.asp?EditorialsID=53

Hope that helps - pls rate the post if it does.

Paresh

[jinhong.im]

Paresh,

Thanks a lot.

Like everything, once we know something it is very easier. I couldn't think it would be concatenation.

Thanks again