This counter reports how many of the remote connections in this port's LLDP remote systems table were detected because a standard IEEE 802.1AB LLDP message was received from that neighbor. Administrators use it to see how many directly connected devices are genuinely LLDP-capable, as opposed to being detected only through MAC learning or Hirschmann's vendor extension. For example, an IEEE entry count of zero on a port where devices are still being detected would mean those neighbors were found via MAC learning or the Hirschmann extension instead of standard LLDP.