amodLinkHdlcRxShort is a Counter that counts the number of received HDLC packets on this link that were too short, i.e. undersized frames. It helps an admin distinguish framing-level corruption from other link problems, since a rising short-frame count usually points to noise truncating frames mid-transmission. For example, comparing this counter's growth rate before and after replacing a modem cable can confirm whether the cable was the source of the errors.