mscAtmIfCAUbrAvailableConnections 1.3.6.1.4.1.562.36.2.1.114.3.110.1.80

This attribute is historical in P6.0. Refer instead to the vccUsage and vpcUsage under the AtmIf CA Ubr component. This attribute indicates the available UBR connections. Its value is ubrMaxConnections minus the number of admitted connections.