An atmSubnetwork is a topological component used for carrying characteristic information(ATM cells within a layer network). The atmSubnetwork is delineated by ATM Subnetwork Termination Points (atmSubnetworkTP). An atmSubnetwork may: be empty containing no atmSubnetworkTP instances; associated with a single linkTP in which case it referred to as a point subnetwork; or associated with many termination points. Subnetworks are used for making subnetwork connections. An instance of atmSubnetwork is specific to the VC or VP layer and is contained in the appropriate vcLayerNetworkDomain or vpLayerNetworkDomain. A point subnetwork does not contain any visible subnetwork connections. The atmSubnetwork object provides an abstraction that allows the establishment and removal of connections across the atmSubnetwork. characteristicInformation describes the format of the characteristic information that the resource carries. This is set to vcCI (I.751) for VC Layer atmSubnetworks and vpCI (I.751) for VP Layer atmSubnetworks. The characteristicInformation, where present, for dependent objects shall match this attribute The userLabel may be used to describe the managing organization. In cases where the atmSubnetwork is managed by a different system the inherited systemTitle may be used. The supportedByObjectList points to managed elements that support the subnetwork. (specific information about these elements is available through the M4 NE view) Supported values for the availabilityStatus are: - Degraded: The atmSubnetwork is degraded in some respect. For instance, the atmSubnetwork cannot perform the function of establishing new atmSubnetworkConnections while it can still accept ACTIONS to tear down existing connections. - Empty SET (none of the availableStatus conditions exist). The setupSubnetworkConnection ACTION sets up a point-to-point or a multipoint connection between non-connected subnetworkTPs in the atmSubnetwork. The modifySubnetworkConnection ACTION modifies the QOS and traffic descriptors of a point-to-point or a multipoint connection between subnetworkTPs in the atmSubnetwork. The addTpsToSubnetworkConnection ACTION adds atmSubnetworkTPs to an existing multipoint subnetwork connection. The removeTpsFromSubnetworkConnection ACTION releases atmSubnetworkTPs from a multipoint atmSubnetworkConnection. The releaseSubnetworkConnection ACTION releases a point-to-point or a multipoint connection between subnetworkTPs in the atmSubnetwork.
Sources for this description
ATM Forum M4 official network view CMIP specifications