[Nml-wg] Adaptations (was: More UML....)

[John Vollbrecht]

On Jun 25, 2008, at 6:59 AM, Freek Dijkstra wrote:

> John Vollbrecht wrote:
>
>> So what exactly is an adaptation.
>
> See also my mail yesterday.
>
> Loosly, adaptation is the encapsulation of one data layer into  
> another data layer.
>
> A de-adaptation is the extraction of data from that lower layer  
> (which also terminates the lower layer path).
>
> Formally (G.800):
>> The adaptation source function is a labelling and encoding entity  
>> that takes one or more client communications passing through its  
>> client facing input port(s), and combines them into instances of  
>> adapted information. The adaptation source function also adds  
>> sufficient labelling in order to distinguish each client  
>> communication from all others within the scope of the access point  
>> to which the adaptation source is bound. The instances of adapted  
>> information are passed through the server facing port.
>
>
>
>> For example, and OTN port might  convert things to SONET,  
>> Ethernet, and other line protocols.  Is this  adaptation?
>
> Yes, if "things" is a higher layer than SONET or Ethernet.

I think that I  understand what you are saying - that  a link has a  
single stream on it and that single stream can be adapted to some  
other layer.  However, in multiplexed networks like  DCN a link can  
carry many streams and each stream can be adapted differently.  In  
fact, in an ete circuit there may be several links and each link may  
do a different adaptation.   How does the topology describe something  
like this?

John