also comprises check beacon field 2006 which is indicative of significant and or critical change in the beacon the manner of indication could embody any of the variations described for fig1 using an embodiment of the check beacon field that is one octet and the smallest possible tim element size the portion of the beacon that must be read to determine whether the access point has buffered data waiting is 45 octets at 1 mb s direct sequence spread spectrum rate receiving this portion of the beacon frame takes 552 u03bcs which is considerably shorter that the typical 2 ms a complete beacon frame would currently take to receive the fact that a station need only be awake a fraction of the time to determine whether the access point has buffered data waiting can conserve power in the station one difficulty in ignoring the remainder of the beacon frame is that the last field in any frame is the frame check sequence fcs which is used to determine the integrity of the received frame without receiving the fcs the station cannot be sure whether the received portion is correct if the tim element is corrupted the consequences are slight an error could cause the station to wake up and poll for buffered data when there.