This Counter32 counts frames sent to the network on this virtual circuit that were marked Discard Eligible by the local DTE, meaning those frames are the first candidates to be dropped if the network becomes congested. An admin tracks it to understand how often locally originated traffic on this DLCI is exceeding its committed burst and relying on best-effort delivery. For example, an admin seeing csFrCircuitSentDEs climb steadily on a file-transfer VC would know that circuit is regularly bursting above its CIR and risks silent frame loss during congestion.