25 | | The Tx Core A |
| 25 | The Tx Core A is fundamentally different than Tx Core B in that its transmission can be qualified on medium idleness. Additionally, it is the transmission state that is capable of honoring a post-Tx timeout interval in which a reception is expected by the MAC state. The DCF implementation uses this core for three different purposes: |
| 26 | |
| 27 | 1. Transmission and retransmission of MPDU frames |
| 28 | 1. Transmission and retransmission of RTS frames |
| 29 | 1. Transmission of CTS frames |
| 30 | |
| 31 | The unifying trait of each of the above transmissions is a condition on medium idleness prior to each. Furthermore, each of the above transmissions utilizes a post-Tx timeout window during which a response is expected. |