This read-write flag enables or disables admission control on this upstream interface, which, when true, makes the scheduler check remaining virtual reserved bandwidth before admitting a new subscriber unit's registration. An admin sets this to true to prevent oversubscribing an upstream's guaranteed bandwidth, or false to let all registrations through regardless of capacity. For example, an operator seeing SUs register successfully but then experience poor voice quality could enable cwdxQosCtrlUpAdmissionCtrl so future registrations are rejected once minimum guaranteed bandwidth is exhausted.