This read-only Counter, valid only for 802.5 Token Ring ports, reports the number of times the MAC chip experienced an internal hardware failure and had to be reset. An administrator uses a rising count here, distinct from sifRingDrops, to point at the adapter chip itself rather than the cabling. For example, the admin sees sifAdapterChecks climbing on a Token Ring port even after replacing the cable, pointing to a failing adapter chip rather than the wiring.