Provides configuration options for sharing the available wireless capacity between the transmit and receive directions. Fixed link symmetry is defined by a ratio of the burst duration for the transmit direction to the burst duration for the receive direction. Permitted settings are 5:1, 3:1, 2:1, 1:1, 1:2, 1:3, 1:5. The 1:1 option provides fixed symmetric operation. The adaptive option selects transmit and receive burst durations automatically in response to the offered Ethernet traffic in each link direction. This attribute is valid only for a unit configured as a TDD Master