# How to swtich tx/rx of XCVR2450 when using gnuradio OFDM\_benchmark example? **URL:** \ **Category:** GNU Radio\ **Created:** [September 4, 2014, 3:58pm UTC](https://www.ruby-forum.com/t/how-to-swtich-tx-rx-of-xcvr2450-when-using-gnuradio-ofdm-benchmark-example/231889 "2014-09-04T15:58:01Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [September 4, 2014, 3:58pm UTC](https://www.ruby-forum.com/t/how-to-swtich-tx-rx-of-xcvr2450-when-using-gnuradio-ofdm-benchmark-example/231889/1 "2014-09-04T15:58:01Z")
HI guys, Thanks in advance. Currently I have been engaged in a project which is based on the OFDM\_benchmark example. I plan to realize a round trip communication between two USRP2 node. Concretely, I want to control the node A switch to RX mode after it finishes transmitting a packet. In such way, the node A can receive the ACK from the node B. - I know XCVR2450 does not support FULL DUPLEX. BTW, I wonder if XCVR2450 can handle the tx/rx switch job automatically? Or should I implement some script (Python) to control it? \* Any help or instruction will be greatly appreciated. Best, Kay. ---
**Author:** ![Yingjie\_C](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f14d63/32.png) [@Yingjie\_C](https://www.ruby-forum.com/u/Yingjie_C)\ **Post date:** [September 5, 2014, 11:28am UTC](https://www.ruby-forum.com/t/how-to-swtich-tx-rx-of-xcvr2450-when-using-gnuradio-ofdm-benchmark-example/231889/2 "2014-09-05T11:28:49Z")
I believe that the OFDM tunnel example automatically switches the TX/RX port to receive when packets are not being transmitted so this should be compatible with your XCVR2450 without modification. Mike – Mike J. M0MIK BSc MIET Ettus R. Technical Support Email: removed\_email\_address@domain.invalid Web: [http://ettus.com](http://ettus.com)