On Aug 20, 2009, at 11:24 AM, Jeroen van der Ham wrote:
Hello,
The NSI group has also been studying the G.800 terminology, and has
attempted to make a table with the different terms in NSI, G.800 and NML.
NSI G.800 NML
--- ----- ---
Layer Topology Layer Network N/A[1]
Subnetwork Subnetwork Network/SwitchMatrix[2]
Link Link Link[3]
Port Link Point Port
Forwarding Port Forwarding Point Port
Segment Link connection Link
Subnet connection
Segment
Access Port Access Group Port?[4]
[1]: The Layer topology concept is not something that we describe
explicitly. Nor do I think that we really need a name for it. It
describes a group of nodes on the same layer. We can describe nodes, and
are planning to describe what layer nodes are on. Getting this group of
nodes is then just a simple query.
Just a point of information - G.8080 (ASON) calls layer topology a routing area, which must exist in a layer.
[2]: A Subnetwork in G.800 terminology is the place where the switching
occurs. However, the subnetwork concept is used at different abstraction
levels, and we have not decided yet how to represent different
abstraction levels.
[3]: The Link concept is still somewhat vague. G.800 uses the term Link
to describe a connection between two ports (G.800: points). However,
they also describe a concept of multiplexing using forwarding ports,
creating a bundle of links on the client layer, this bundle is not
explicitly named in G.800.
I'm not entirely sure whether NSI Link concept is the NML Link concept,
or the G.800 bundle (or both).
Another point of information. In G.8080(ASON) and NSI link is called a SNPP Link
(for SubNet Point Pool) and a segment or link connection is called a SNP link connection.