- #1
fog37
- 1,568
- 108
hello forum,
I have read about SONET which seems to be a physical layer protocol to transport data over fiber optics.
SONET is a TDM (time division multiplexing method). TDM means that that time divided into slots and shared between different users. For example, given three users A, B and C, the transmission would be ABCABCABC...
That said, I would think SONET works the same way. The SONET frame is 810 bytes. I am sure those bytes contain extra information (header, etc.) besides the actual data. Do those 810 bytes contain data from multiple different sources or from the same source? For instance, I imagine different laser sources (each with its own wavelength) being WDM together but each individual wavelength carries SONET frames which carry each TDM type traffic...
It is said that the frame is composed of 9 rows of 90 columns of 8-bit bytes. I am not sure how to interpret ths row/columns structure. It is easier to see the 810 bytes arranged sequentially. I think that is how they are physically transmitted...
thanks,
fog37
I have read about SONET which seems to be a physical layer protocol to transport data over fiber optics.
SONET is a TDM (time division multiplexing method). TDM means that that time divided into slots and shared between different users. For example, given three users A, B and C, the transmission would be ABCABCABC...
That said, I would think SONET works the same way. The SONET frame is 810 bytes. I am sure those bytes contain extra information (header, etc.) besides the actual data. Do those 810 bytes contain data from multiple different sources or from the same source? For instance, I imagine different laser sources (each with its own wavelength) being WDM together but each individual wavelength carries SONET frames which carry each TDM type traffic...
It is said that the frame is composed of 9 rows of 90 columns of 8-bit bytes. I am not sure how to interpret ths row/columns structure. It is easier to see the 810 bytes arranged sequentially. I think that is how they are physically transmitted...
thanks,
fog37