This read-only value reports how much outgoing bandwidth is currently actually allocated to active QoS Class 1 connections on this port, the in-use complement to the still-available figure in lportOutVAvailbwQoS1, together the two should roughly sum to the total reserved capacity in lportAtmDataRateQoS1. An admin uses this allocated figure to see real committed usage rather than remaining headroom, useful for capacity trend analysis over time. For example, tracking lportOutAllocbwQoS1 growth over several months as more voice circuits get provisioned on this port helps the admin forecast when the class-1 reservation will need to be increased.