diff --git a/src/libboard_artiq/src/cxp_upconn.rs b/src/libboard_artiq/src/cxp_upconn.rs
index 56dd702..17b928f 100644
--- a/src/libboard_artiq/src/cxp_upconn.rs
+++ b/src/libboard_artiq/src/cxp_upconn.rs
@@ -15,8 +15,8 @@ pub fn tx_test(channel: u8, timer: &mut GlobalTimer) {
 
     let channel = channel as usize;
     unsafe {
-        (CXP[channel].tx_trig_delay_write)(0x86);
-        (CXP[channel].tx_linktrigger_write)(0x00);
+        // (CXP[channel].tx_trig_delay_write)(0x86);
+        // (CXP[channel].tx_linktrigger_write)(0x00);
 
         // DEBUG: prepare the packet before tx enable to avoid overhead
         preload_tx_packet(