This read-only INTEGER counts the number of aborted frames received on the HDLC link, i.e. frames the sender terminated early with an HDLC abort sequence instead of completing normally. A climbing count suggests the remote end is repeatedly cutting off transmissions, which can result from buffer underruns or link instability on the sending side. For example, an admin seeing frequent aborts alongside dropped calls on an ISDN link would suspect the remote router is struggling to keep up with the link's clock rate.