diff --git a/openair1/PHY/LTE_TRANSPORT/if4_tools.c b/openair1/PHY/LTE_TRANSPORT/if4_tools.c
index c671d78aba..a906b6df31 100644
--- a/openair1/PHY/LTE_TRANSPORT/if4_tools.c
+++ b/openair1/PHY/LTE_TRANSPORT/if4_tools.c
@@ -207,7 +207,7 @@ void send_IF4p5(RU_t *ru, int frame, int subframe, uint16_t packet_type) {
   } else if (packet_type >= IF4p5_PRACH && 
 	     packet_type <= IF4p5_PRACH+4) {
     // FIX: hard coded prach samples length
-    LOG_D(PHY,"IF4p5_PRACH: frame %d, subframe %d\n",frame,subframe);
+    LOG_D(PHY,"IF4p5_PRACH: frame %d, subframe %d,packet type %x\n",frame,subframe,packet_type);
     db_fulllength = PRACH_NUM_SAMPLES;
     
     if (eth->flags == ETH_RAW_IF4p5_MODE) {
@@ -248,6 +248,7 @@ void send_IF4p5(RU_t *ru, int frame, int subframe, uint16_t packet_type) {
 				     packet_type)) < 0) {
       perror("ETHERNET write for IF4p5_PRACH\n");
     }
+
     VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_WRITE_IF, 0 );      
   } else {    
     AssertFatal(1==0, "send_IF4p5 - Unknown packet_type %x", packet_type);     
diff --git a/openair1/PHY/LTE_TRANSPORT/if4_tools.h b/openair1/PHY/LTE_TRANSPORT/if4_tools.h
index a251c62d0d..0a95e60ead 100644
--- a/openair1/PHY/LTE_TRANSPORT/if4_tools.h
+++ b/openair1/PHY/LTE_TRANSPORT/if4_tools.h
@@ -39,11 +39,11 @@
 #define IF4p5_PULFFT 0x0019 
 #define IF4p5_PDLFFT 0x0020
 #define IF4p5_PRACH 0x0021
-#define IF4p5_PRACH_BR_CE0 0x0021
-#define IF4p5_PRACH_BR_CE1 0x0022
-#define IF4p5_PRACH_BR_CE2 0x0023
-#define IF4p5_PRACH_BR_CE3 0x0024
-#define IF4p5_PULTICK 0x0025
+#define IF4p5_PRACH_BR_CE0 0x0022
+#define IF4p5_PRACH_BR_CE1 0x0023
+#define IF4p5_PRACH_BR_CE2 0x0024
+#define IF4p5_PRACH_BR_CE3 0x0025
+#define IF4p5_PULTICK 0x0026
 
 struct IF4p5_header {  
   /// Type
diff --git a/openair1/PHY/LTE_TRANSPORT/prach.c b/openair1/PHY/LTE_TRANSPORT/prach.c
index 606900677e..c4e4461a58 100644
--- a/openair1/PHY/LTE_TRANSPORT/prach.c
+++ b/openair1/PHY/LTE_TRANSPORT/prach.c
@@ -640,7 +640,7 @@ int32_t generate_prach( PHY_VARS_UE *ue, uint8_t eNB_id, uint8_t subframe, uint1
 #if defined(EXMIMO) || defined(OAI_USRP)
   prach_start =  (ue->rx_offset+subframe*ue->frame_parms.samples_per_tti-ue->hw_timing_advance-ue->N_TA_offset);
 #ifdef PRACH_DEBUG
-    LOG_I(PHY,"[UE %d] prach_start %d, rx_offset %d, hw_timing_advance %d, N_TA_offset %d\n", ue->Mod_id,
+    LOG_D(PHY,"[UE %d] prach_start %d, rx_offset %d, hw_timing_advance %d, N_TA_offset %d\n", ue->Mod_id,
         prach_start,
         ue->rx_offset,
         ue->hw_timing_advance,
diff --git a/targets/ARCH/ETHERNET/USERSPACE/LIB/eth_udp.c b/targets/ARCH/ETHERNET/USERSPACE/LIB/eth_udp.c
index e323a9d5bc..9dbd29afdb 100644
--- a/targets/ARCH/ETHERNET/USERSPACE/LIB/eth_udp.c
+++ b/targets/ARCH/ETHERNET/USERSPACE/LIB/eth_udp.c
@@ -235,7 +235,8 @@ int trx_eth_write_udp_IF4p5(openair0_device *device, openair0_timestamp timestam
     packet_size = UDP_IF4p5_PULFFT_SIZE_BYTES(nblocks); 
   } else if (flags == IF4p5_PULTICK) {
     packet_size = UDP_IF4p5_PULTICK_SIZE_BYTES; 
-  } else if (flags == IF4p5_PRACH) {  
+  } else if ((flags >= IF4p5_PRACH)&&
+             (flags <= (IF4p5_PRACH+4))) {  
     packet_size = UDP_IF4p5_PRACH_SIZE_BYTES;   
   } else {
     printf("trx_eth_write_udp_IF4p5: unknown flags %d\n",flags);
@@ -243,7 +244,6 @@ int trx_eth_write_udp_IF4p5(openair0_device *device, openair0_timestamp timestam
   }
    
   eth->tx_nsamps = nblocks;
-  //  printf("Sending %d bytes to %s:%d\n",packet_size,str,ntohs(eth->local_addrd.sin_port));
 
   bytes_sent = sendto(eth->sockfdd,
 		      buff[0], 
diff --git a/targets/RT/USER/lte-ru.c b/targets/RT/USER/lte-ru.c
index 752e221ac5..54693f43c8 100644
--- a/targets/RT/USER/lte-ru.c
+++ b/targets/RT/USER/lte-ru.c
@@ -596,13 +596,14 @@ void fh_if4p5_north_asynch_in(RU_t *ru,int *frame,int *subframe) {
   symbol_mask_full = ((subframe_select(fp,*subframe) == SF_S) ? (1<<fp->dl_symbols_in_S_subframe) : (1<<fp->symbols_per_tti))-1;
   do {   
     recv_IF4p5(ru, &frame_tx, &subframe_tx, &packet_type, &symbol_number);
-    if ((subframe_select(fp,*subframe) == SF_DL) && (symbol_number == 0)) start_meas(&ru->rx_fhaul);
+    if ((subframe_select(fp,subframe_tx) == SF_DL) && (symbol_number == 0)) start_meas(&ru->rx_fhaul);
     LOG_D(PHY,"subframe %d (%d): frame %d, subframe %d, symbol %d\n",
          *subframe,subframe_select(fp,*subframe),frame_tx,subframe_tx,symbol_number);
     if (proc->first_tx != 0) {
       *frame    = frame_tx;
       *subframe = subframe_tx;
       proc->first_tx = 0;
+      symbol_mask_full = ((subframe_select(fp,*subframe) == SF_S) ? (1<<fp->dl_symbols_in_S_subframe) : (1<<fp->symbols_per_tti))-1;
     }
     else {
       AssertFatal(frame_tx == *frame,
@@ -616,7 +617,7 @@ void fh_if4p5_north_asynch_in(RU_t *ru,int *frame,int *subframe) {
     else AssertFatal(1==0,"Illegal IF4p5 packet type (should only be IF4p5_PDLFFT%d\n",packet_type);
   } while (symbol_mask != symbol_mask_full);    
 
-  if (subframe_select(fp,*subframe) == SF_DL) stop_meas(&ru->rx_fhaul);
+  if (subframe_select(fp,subframe_tx) == SF_DL) stop_meas(&ru->rx_fhaul);
 
   proc->subframe_tx  = subframe_tx;
   proc->frame_tx     = frame_tx;
@@ -871,7 +872,10 @@ static void* ru_thread_asynch_rxtx( void* param ) {
     // asynchronous receive from south (Mobipass)
     if (ru->fh_south_asynch_in) ru->fh_south_asynch_in(ru,&frame,&subframe);
     // asynchronous receive from north (RRU IF4/IF5)
-    else if (ru->fh_north_asynch_in) ru->fh_north_asynch_in(ru,&frame,&subframe);
+    else if (ru->fh_north_asynch_in) {
+       if (subframe_select(&ru->frame_parms,subframe)!=SF_UL)
+         ru->fh_north_asynch_in(ru,&frame,&subframe);
+    }
     else AssertFatal(1==0,"Unknown function in ru_thread_asynch_rxtx\n");
   }