csOc3PosSentFrameUserAborted is a read-only 64-bit counter of the number of transmit frames on this OC3 port that were deliberately aborted by a user, rather than by a hardware condition. Because this counts a deliberate action, a nonzero and growing value is generally not itself alarming, but an admin seeing an unexpectedly large count should check whether an application on the sending side is repeatedly cancelling transmissions. For example, if csOc3PosSentFrameUserAborted spikes right after a new application was deployed on the router feeding this OC3 port, an admin would investigate that application's transmit-cancellation behavior rather than the OC3 hardware itself.