Strict Topological Elements in G.805 & co.

Layer Network

A layer network is defined by the complete set of access groups of the same type. For each train termination type, a separate, logically distinct layer network exists. The topology of a layer network is described by access groups, subnetworks and the links between them. (ITU G.805, 3.17 & 5.2.1.1, ITU G.809, 3.21 & 6.3.1.1)

Subnetwork

A subnetwork exists within a single connection-oriented layer network. It is defined by the set of ports which are available for the purpose of transferring characteristic information. In general, subnetworks may be partitioned into smaller subnetworks interconnected by links. (ITU G.805, 3.33 & 5.2.1.2)

Matrix

The matrix is a special case of a subnetwork or a flow domain that cannot be further partitioned. (ITU G.805, 3.21 & 5.2.1.2, ITU G.809, 3.23 & 6.3.1.2)

Flow Domain

A flow domain exists within a single connection-less layer network. It is defined by the set of flow points that are available for the purpose of transferring information. In general, flow domains may be partitioned into smaller flow domains interconnected by flow point pool links. (ITU G.809, 3.13 & 6.3.1.2)

Access Group

An access group is a group of co-located trail termination functions (for connection-oriented layer networks) or flow termination fuctions (for connection-less layer networks) that are connected to the same subnetwork or link. (ITU G.805, 3.1 & 5.2.1.4, ITU G.809, 3.1 & 6.3.1.4)

Note: I understand shit from this definition; don't like it. What's the advantage of using "access groups" over "ports"? A nice hypothesis was that "access group" comes from SS7 (ITU Q.700-Q.799), but that only defines link groups, not access groups. -- Freek

Link

The link represents the topological relationship and available transport capacity between a pair of subnetworks, or a subnetwork and an access group or a pair of access groups. (ITU G.805, 3.18 & 5.2.1.3)

Note: So it is between a set of ports on one side, and another set of ports on the other side, rather between two single ports.

Flow point pool link

The flow point pool link (FPP link) represents the topological relationship and available capacity between a pair of flow domains, or a flow domain and an access group, or a pair of access groups. (ITU G.809, 3.18 & 6.3.1.3)

Categories

CategoryTechnologies