Hello Elnaz,
You ask:
There is an image in G.783 that shows atomic functions of SDH
layers include trail terminations, adaptations and connections.
(Figure 1-1/G.783 – General functional block diagram)
Note that this is just an overview.
Each of the functions is described in ITU-T Recommendation G.806
(termination function, adaptation function, connection function)
would you please some one tell me in this picture, what is the
meaning of every arrow exactly? Is it shown transmission of one
object? for example, according to G.783 if adaptation of
higher-order path layer which is called Sn/Sm in sink direction
has one input as VC-4 its output will be VC-12. but It doubts
me that the arrow which exists in output of this adaptation is
shown exit of one VC-12 or 21* VC-12 which they make every VC-4.
The arrow shows the flow of information, a single arrow may represent
a multiplex of several signals.
In the case of the sink addaption function Sn/Sm the output arrow
represents 63 VC-12, or 3 VC-3, or a mix of these.
If 21*VC-12 would have been exited from such an adaptation, so
there must have been exited 21 arrows from adaptation.
Indeed, but this would have made de figure very complex.
Or maybe, because of mapping of every kind of traffic in SDH > frame has different kind or ways, this picture describes
generally this process!
It is indeed a generic figure.
All the information of each function shown in figure 1/G.783
is described separately in the same document.
Best regards, Huub.
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