OID_IRDA_TURNAROUND_TIME
The OID_IRDA_TURNAROUND_TIME OID requests that the miniport driver return the turnaround time (in microseconds) of its NIC's transceiver. Turnaround time is the time required for the transceiver to recover from a saturated state as the result of transmitting a bit. After the turnaround time has elapsed, the local transceiver can receive a bit transmitted by the remote transceiver.
IrLAP supplies the minimum turnaround time of the local NIC's transceiver to the remote station. After receiving a transmission from the local NIC's transceiver, the transceiver of the remote station must wait the specified minimum turnaround around time before starting a transmission.