[Nml-wg] Tube Terminology
Aaron Brown
aaron at internet2.edu
Fri Apr 4 07:21:38 CDT 2008
Jeroen van der Ham wrote:
> Figure 1 shows several terms:
> - *connection point* is any point that can make a connection (the
> circles in the figures)
> - *network connection* is the terminated connection from A to B.
> - *link connection* is a direct connection between two connection points.
> - *subnetwork connection* is a connection between two connection
> points that you can not or do not want to describe the details of.
> - *tandem connection* is a concatenation of link connections
>
> Figure 2 shows a multi-layer network connection between X and Y. If we
> start from X, we first encounter an *adaptation* to a lower layer.
> Then we go through another link connection. At that connection point
> we use *multiplexing* to adapt to a lower layer to connection point A.
> Then we use the same network connection as in figure 1 to go to B,
> where we go through *multiplexing*, a *link connection*, and an
> *adaptation* to arrive at Y.
> Note that the multiplexed connection can also be viewed as a link
> connection on a higher layer. The same goes for the connection between
> X and Y, which is a link connection at the highest layer. And because
> the connection is therminated there, it is also a network connection.
Both a network and a link connection seem to be 'connections between two
points'. You say that in one case it's terminated and in one case it's
not. Is 'terminated' a property of the link or is it a property of the
connection point (or the node the connection point is attached to,
depending on one's definition of connection point)? What differentiates
a link whose contents gets demux'd to an higher layer vs. a link whose
contents get routed at the same layer?
A subnetwork connection is a link or network connection that you view as
opaque, correct? I.e. I've got a connection between these two points, i
either don't know or don't care how it's constructed. If so, would
"opaque connection" be a more clear description?
A tandem connection is a network or link connection that spans multiple
connections? How does it differ from a network connection which in
figure 1 also spans multiple connections?
Cheers,
Aaron
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